diff --git a/test/internet/test-dns-txt-sigsegv.js b/test/internet/test-dns-txt-sigsegv.js
index eba5c66c464981..4c2f12f7a97c28 100644
--- a/test/internet/test-dns-txt-sigsegv.js
+++ b/test/internet/test-dns-txt-sigsegv.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dns = require('dns');
 
diff --git a/test/internet/test-dns.js b/test/internet/test-dns.js
index 2a423f97dee7b0..5c89021c030b19 100644
--- a/test/internet/test-dns.js
+++ b/test/internet/test-dns.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert'),
     dns = require('dns'),
     net = require('net'),
diff --git a/test/internet/test-http-dns-fail.js b/test/internet/test-http-dns-fail.js
index 151597de14cb0e..7e2f8cd402d658 100644
--- a/test/internet/test-http-dns-fail.js
+++ b/test/internet/test-http-dns-fail.js
@@ -4,7 +4,7 @@
  * should trigger the error event after each attempt.
  */
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var http = require('http');
 
diff --git a/test/internet/test-net-connect-timeout.js b/test/internet/test-net-connect-timeout.js
index b92d234852967e..fd78a2936bd88b 100644
--- a/test/internet/test-net-connect-timeout.js
+++ b/test/internet/test-net-connect-timeout.js
@@ -3,7 +3,7 @@
 // https://groups.google.com/forum/#!topic/nodejs/UE0ZbfLt6t8
 // https://groups.google.com/forum/#!topic/nodejs-dev/jR7-5UDqXkw
 
-var common = require('../common');
+require('../common');
 var net = require('net');
 var assert = require('assert');
 
diff --git a/test/internet/test-net-connect-unref.js b/test/internet/test-net-connect-unref.js
index a712490d31f566..ad24683b34d49e 100644
--- a/test/internet/test-net-connect-unref.js
+++ b/test/internet/test-net-connect-unref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var net = require('net');
 
diff --git a/test/message/2100bytes.js b/test/message/2100bytes.js
index b05f5e9e1d7168..930b706f977671 100644
--- a/test/message/2100bytes.js
+++ b/test/message/2100bytes.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 
diff --git a/test/message/core_line_numbers.js b/test/message/core_line_numbers.js
index ab86eb1e38f7f4..221001ed8952d0 100644
--- a/test/message/core_line_numbers.js
+++ b/test/message/core_line_numbers.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const punycode = require('punycode');
 
 // This test verifies that line numbers in core modules are reported correctly.
diff --git a/test/message/error_exit.js b/test/message/error_exit.js
index 7805fd21935377..18d9dfb4ee998c 100644
--- a/test/message/error_exit.js
+++ b/test/message/error_exit.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 process.on('exit', function(code) {
diff --git a/test/message/eval_messages.js b/test/message/eval_messages.js
index 0b17bf5f97ae52..7d3444c236b68e 100644
--- a/test/message/eval_messages.js
+++ b/test/message/eval_messages.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/message/hello_world.js b/test/message/hello_world.js
index 1e6b030393c6cf..dfcba71bdd4334 100644
--- a/test/message/hello_world.js
+++ b/test/message/hello_world.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 console.log('hello world');
diff --git a/test/message/max_tick_depth.js b/test/message/max_tick_depth.js
index cacd795810605a..1d2ec175c5d957 100644
--- a/test/message/max_tick_depth.js
+++ b/test/message/max_tick_depth.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 
 process.maxTickDepth = 10;
 var i = 20;
diff --git a/test/message/nexttick_throw.js b/test/message/nexttick_throw.js
index 3c0e2d8e379fd9..474531a0160875 100644
--- a/test/message/nexttick_throw.js
+++ b/test/message/nexttick_throw.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 process.nextTick(function() {
diff --git a/test/message/stack_overflow.js b/test/message/stack_overflow.js
index 7d1033c3ab2b1a..edcbe3b2d6fa28 100644
--- a/test/message/stack_overflow.js
+++ b/test/message/stack_overflow.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 Error.stackTraceLimit = 0;
diff --git a/test/message/stdin_messages.js b/test/message/stdin_messages.js
index e99c08553a916d..4f87626f63cee6 100644
--- a/test/message/stdin_messages.js
+++ b/test/message/stdin_messages.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/message/throw_custom_error.js b/test/message/throw_custom_error.js
index bb5dae05a9b03a..9466ed9e8b4747 100644
--- a/test/message/throw_custom_error.js
+++ b/test/message/throw_custom_error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // custom error throwing
diff --git a/test/message/throw_in_line_with_tabs.js b/test/message/throw_in_line_with_tabs.js
index 50c69ca681019d..54dcd9f3a64c3b 100644
--- a/test/message/throw_in_line_with_tabs.js
+++ b/test/message/throw_in_line_with_tabs.js
@@ -1,6 +1,6 @@
 /* eslint-disable indent */
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 console.error('before');
diff --git a/test/message/throw_non_error.js b/test/message/throw_non_error.js
index a1046b725e93a4..2fb82ee053d55a 100644
--- a/test/message/throw_non_error.js
+++ b/test/message/throw_non_error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // custom error throwing
diff --git a/test/message/throw_null.js b/test/message/throw_null.js
index ab8fb565a61e54..c252fba1ecfbb6 100644
--- a/test/message/throw_null.js
+++ b/test/message/throw_null.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 throw null;
diff --git a/test/message/throw_undefined.js b/test/message/throw_undefined.js
index f855cdd2f7dabd..da2ae18c444d82 100644
--- a/test/message/throw_undefined.js
+++ b/test/message/throw_undefined.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 throw undefined;
diff --git a/test/message/timeout_throw.js b/test/message/timeout_throw.js
index aaf3fbc8d2f48f..648f874b7e15c4 100644
--- a/test/message/timeout_throw.js
+++ b/test/message/timeout_throw.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 setTimeout(function() {
diff --git a/test/message/undefined_reference_in_new_context.js b/test/message/undefined_reference_in_new_context.js
index 7256c0d8e36088..4230ce6529336c 100644
--- a/test/message/undefined_reference_in_new_context.js
+++ b/test/message/undefined_reference_in_new_context.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/message/vm_display_runtime_error.js b/test/message/vm_display_runtime_error.js
index d01ab0b540b3cb..3525ab4d03073f 100644
--- a/test/message/vm_display_runtime_error.js
+++ b/test/message/vm_display_runtime_error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/message/vm_dont_display_syntax_error.js b/test/message/vm_dont_display_syntax_error.js
index 42b1ab14cba76f..bff23e533dcfed 100644
--- a/test/message/vm_dont_display_syntax_error.js
+++ b/test/message/vm_dont_display_syntax_error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-assert-typedarray-deepequal.js b/test/parallel/test-assert-typedarray-deepequal.js
index 32748784dfe9a8..68edefdc175317 100644
--- a/test/parallel/test-assert-typedarray-deepequal.js
+++ b/test/parallel/test-assert-typedarray-deepequal.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const a = require('assert');
 
diff --git a/test/parallel/test-async-wrap-throw-no-init.js b/test/parallel/test-async-wrap-throw-no-init.js
index b2f60f3215e850..768e38e8eff389 100644
--- a/test/parallel/test-async-wrap-throw-no-init.js
+++ b/test/parallel/test-async-wrap-throw-no-init.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const async_wrap = process.binding('async_wrap');
 
diff --git a/test/parallel/test-buffer-arraybuffer.js b/test/parallel/test-buffer-arraybuffer.js
index c25de262ea9779..522d97ece196c1 100644
--- a/test/parallel/test-buffer-arraybuffer.js
+++ b/test/parallel/test-buffer-arraybuffer.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 const Buffer = require('buffer').Buffer;
diff --git a/test/parallel/test-buffer-ascii.js b/test/parallel/test-buffer-ascii.js
index efc3a72c662595..94ba85a22761dd 100644
--- a/test/parallel/test-buffer-ascii.js
+++ b/test/parallel/test-buffer-ascii.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // ASCII conversion in node.js simply masks off the high bits,
diff --git a/test/parallel/test-buffer-bytelength.js b/test/parallel/test-buffer-bytelength.js
index b292970f94184a..32ed6dbd67615e 100644
--- a/test/parallel/test-buffer-bytelength.js
+++ b/test/parallel/test-buffer-bytelength.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Buffer = require('buffer').Buffer;
 
diff --git a/test/parallel/test-buffer-concat.js b/test/parallel/test-buffer-concat.js
index 8d0c0eebbd14e6..07f763a76dc419 100644
--- a/test/parallel/test-buffer-concat.js
+++ b/test/parallel/test-buffer-concat.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var zero = [];
diff --git a/test/parallel/test-buffer-fakes.js b/test/parallel/test-buffer-fakes.js
index d473d16e92159f..5804cbba303408 100644
--- a/test/parallel/test-buffer-fakes.js
+++ b/test/parallel/test-buffer-fakes.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const Buffer = require('buffer').Buffer;
 const Bp = Buffer.prototype;
diff --git a/test/parallel/test-buffer-includes.js b/test/parallel/test-buffer-includes.js
index be002bb7f26d1a..8eaf2d479761db 100644
--- a/test/parallel/test-buffer-includes.js
+++ b/test/parallel/test-buffer-includes.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 const Buffer = require('buffer').Buffer;
diff --git a/test/parallel/test-buffer-indexof.js b/test/parallel/test-buffer-indexof.js
index d358749f8efc01..aac5b18f718cb3 100644
--- a/test/parallel/test-buffer-indexof.js
+++ b/test/parallel/test-buffer-indexof.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Buffer = require('buffer').Buffer;
diff --git a/test/parallel/test-buffer-inheritance.js b/test/parallel/test-buffer-inheritance.js
index eb2f4a531d0b38..ea61e50bf5f04a 100644
--- a/test/parallel/test-buffer-inheritance.js
+++ b/test/parallel/test-buffer-inheritance.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 
diff --git a/test/parallel/test-buffer-inspect.js b/test/parallel/test-buffer-inspect.js
index 35da378631aee8..6d44389de735a2 100644
--- a/test/parallel/test-buffer-inspect.js
+++ b/test/parallel/test-buffer-inspect.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var util = require('util');
diff --git a/test/parallel/test-buffer-iterator.js b/test/parallel/test-buffer-iterator.js
index 05371d6d793fed..ad135a9113627d 100644
--- a/test/parallel/test-buffer-iterator.js
+++ b/test/parallel/test-buffer-iterator.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var buffer = new Buffer([1, 2, 3, 4, 5]);
diff --git a/test/parallel/test-buffer-slow.js b/test/parallel/test-buffer-slow.js
index d7b4f486e21422..cf1a3fd8eb200d 100644
--- a/test/parallel/test-buffer-slow.js
+++ b/test/parallel/test-buffer-slow.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const buffer = require('buffer');
 const Buffer = buffer.Buffer;
diff --git a/test/parallel/test-child-process-constructor.js b/test/parallel/test-child-process-constructor.js
index 89db9cf81fddc7..6980810485c964 100644
--- a/test/parallel/test-child-process-constructor.js
+++ b/test/parallel/test-child-process-constructor.js
@@ -1,7 +1,7 @@
 'use strict';
 
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 var child_process = require('child_process');
 var ChildProcess = child_process.ChildProcess;
 assert.equal(typeof ChildProcess, 'function');
diff --git a/test/parallel/test-child-process-detached.js b/test/parallel/test-child-process-detached.js
index 25b811a8caa991..711c5d227d6b07 100644
--- a/test/parallel/test-child-process-detached.js
+++ b/test/parallel/test-child-process-detached.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var path = require('path');
 
diff --git a/test/parallel/test-child-process-fork-and-spawn.js b/test/parallel/test-child-process-fork-and-spawn.js
index d5255bf83ca8e0..5766dc865bc975 100644
--- a/test/parallel/test-child-process-fork-and-spawn.js
+++ b/test/parallel/test-child-process-fork-and-spawn.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var spawn = require('child_process').spawn;
 var fork = require('child_process').fork;
diff --git a/test/parallel/test-child-process-fork-ref.js b/test/parallel/test-child-process-fork-ref.js
index b4066641bae970..de34f3eb8ae9c3 100644
--- a/test/parallel/test-child-process-fork-ref.js
+++ b/test/parallel/test-child-process-fork-ref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fork = require('child_process').fork;
 
diff --git a/test/parallel/test-child-process-fork-ref2.js b/test/parallel/test-child-process-fork-ref2.js
index 8bc7e4c35541b2..b7addea8f9c77d 100644
--- a/test/parallel/test-child-process-fork-ref2.js
+++ b/test/parallel/test-child-process-fork-ref2.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fork = require('child_process').fork;
 
diff --git a/test/parallel/test-child-process-internal.js b/test/parallel/test-child-process-internal.js
index c39dc93293aa8b..03ea340236ad34 100644
--- a/test/parallel/test-child-process-internal.js
+++ b/test/parallel/test-child-process-internal.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 //messages
diff --git a/test/parallel/test-child-process-set-blocking.js b/test/parallel/test-child-process-set-blocking.js
index 3f09388265b89a..6cdfbbc9a24c71 100644
--- a/test/parallel/test-child-process-set-blocking.js
+++ b/test/parallel/test-child-process-set-blocking.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var ch = require('child_process');
 
diff --git a/test/parallel/test-child-process-silent.js b/test/parallel/test-child-process-silent.js
index 3714d3758d0f22..c3705ab2a4d7e0 100644
--- a/test/parallel/test-child-process-silent.js
+++ b/test/parallel/test-child-process-silent.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var childProcess = require('child_process');
 
diff --git a/test/parallel/test-child-process-spawnsync-env.js b/test/parallel/test-child-process-spawnsync-env.js
index 646097f9454c5c..4455b867e30108 100644
--- a/test/parallel/test-child-process-spawnsync-env.js
+++ b/test/parallel/test-child-process-spawnsync-env.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cp = require('child_process');
 
diff --git a/test/parallel/test-child-process-spawnsync-timeout.js b/test/parallel/test-child-process-spawnsync-timeout.js
index 34c69a1fc597d2..122a65825949df 100644
--- a/test/parallel/test-child-process-spawnsync-timeout.js
+++ b/test/parallel/test-child-process-spawnsync-timeout.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawnSync = require('child_process').spawnSync;
diff --git a/test/parallel/test-child-process-stdin-ipc.js b/test/parallel/test-child-process-stdin-ipc.js
index d2347849dd5b9b..79e60f333b9d6b 100644
--- a/test/parallel/test-child-process-stdin-ipc.js
+++ b/test/parallel/test-child-process-stdin-ipc.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/parallel/test-child-process-stdio-big-write-end.js b/test/parallel/test-child-process-stdio-big-write-end.js
index 5ae85acc54d9dd..bc414938b581e3 100644
--- a/test/parallel/test-child-process-stdio-big-write-end.js
+++ b/test/parallel/test-child-process-stdio-big-write-end.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var BUFSIZE = 1024;
 
diff --git a/test/parallel/test-child-process-validate-stdio.js b/test/parallel/test-child-process-validate-stdio.js
index 289323002da4bd..0a12e4f54c5306 100644
--- a/test/parallel/test-child-process-validate-stdio.js
+++ b/test/parallel/test-child-process-validate-stdio.js
@@ -1,8 +1,8 @@
 'use strict';
 // Flags: --expose_internals
 
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 var _validateStdio = require('internal/child_process')._validateStdio;
 
 // should throw if string and not ignore, pipe, or inherit
diff --git a/test/parallel/test-cluster-debug-port.js b/test/parallel/test-cluster-debug-port.js
index 1a42850e9b2bc1..076a59108b09de 100644
--- a/test/parallel/test-cluster-debug-port.js
+++ b/test/parallel/test-cluster-debug-port.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-fork-env.js b/test/parallel/test-cluster-fork-env.js
index 7749e42f608c60..fb58daee0cffdb 100644
--- a/test/parallel/test-cluster-fork-env.js
+++ b/test/parallel/test-cluster-fork-env.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-setup-master-cumulative.js b/test/parallel/test-cluster-setup-master-cumulative.js
index 0376546d286b51..f0f98fbdbfb3a6 100644
--- a/test/parallel/test-cluster-setup-master-cumulative.js
+++ b/test/parallel/test-cluster-setup-master-cumulative.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-setup-master-emit.js b/test/parallel/test-cluster-setup-master-emit.js
index 8b463ec97bff45..ad15c084c5924d 100644
--- a/test/parallel/test-cluster-setup-master-emit.js
+++ b/test/parallel/test-cluster-setup-master-emit.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-setup-master-multiple.js b/test/parallel/test-cluster-setup-master-multiple.js
index 8ee6d091cd524a..5ceff2bddfaf9d 100644
--- a/test/parallel/test-cluster-setup-master-multiple.js
+++ b/test/parallel/test-cluster-setup-master-multiple.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-setup-master.js b/test/parallel/test-cluster-setup-master.js
index c32b3ea6d3b18b..561371afb027a3 100644
--- a/test/parallel/test-cluster-setup-master.js
+++ b/test/parallel/test-cluster-setup-master.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-uncaught-exception.js b/test/parallel/test-cluster-uncaught-exception.js
index ec42773ef55856..04eac2e8ce63d4 100644
--- a/test/parallel/test-cluster-uncaught-exception.js
+++ b/test/parallel/test-cluster-uncaught-exception.js
@@ -3,7 +3,7 @@
 // one that the cluster module installs.
 // https://github.com/joyent/node/issues/2556
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 var fork = require('child_process').fork;
diff --git a/test/parallel/test-cluster-worker-constructor.js b/test/parallel/test-cluster-worker-constructor.js
index e29dc01561903d..2a96d24a8a3459 100644
--- a/test/parallel/test-cluster-worker-constructor.js
+++ b/test/parallel/test-cluster-worker-constructor.js
@@ -2,7 +2,7 @@
 // test-cluster-worker-constructor.js
 // validates correct behavior of the cluster.Worker constructor
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 var worker;
diff --git a/test/parallel/test-cluster-worker-death.js b/test/parallel/test-cluster-worker-death.js
index 88a0f887cc2cab..65da9865b0dd2d 100644
--- a/test/parallel/test-cluster-worker-death.js
+++ b/test/parallel/test-cluster-worker-death.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 
diff --git a/test/parallel/test-cluster-worker-init.js b/test/parallel/test-cluster-worker-init.js
index 38886af5279a6d..41f73e1255a7c5 100644
--- a/test/parallel/test-cluster-worker-init.js
+++ b/test/parallel/test-cluster-worker-init.js
@@ -3,7 +3,7 @@
 // verifies that, when a child process is forked, the cluster.worker
 // object can receive messages as expected
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 var msg = 'foo';
diff --git a/test/parallel/test-console-instance.js b/test/parallel/test-console-instance.js
index a80c6e57e4b151..1ab038df48e432 100644
--- a/test/parallel/test-console-instance.js
+++ b/test/parallel/test-console-instance.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Stream = require('stream');
 var Console = require('console').Console;
diff --git a/test/parallel/test-console-not-call-toString.js b/test/parallel/test-console-not-call-toString.js
index 7846dbf2778b9c..f152e33e98f087 100644
--- a/test/parallel/test-console-not-call-toString.js
+++ b/test/parallel/test-console-not-call-toString.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var func = function() {};
diff --git a/test/parallel/test-console.js b/test/parallel/test-console.js
index 0162ddf1b88d57..4a5befd2e343ae 100644
--- a/test/parallel/test-console.js
+++ b/test/parallel/test-console.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert.ok(process.stdout.writable);
diff --git a/test/parallel/test-delayed-require.js b/test/parallel/test-delayed-require.js
index 5fa82f236c1dd9..7376e70ba780e2 100644
--- a/test/parallel/test-delayed-require.js
+++ b/test/parallel/test-delayed-require.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var a;
diff --git a/test/parallel/test-dgram-bind.js b/test/parallel/test-dgram-bind.js
index 6d35534cb5eb56..0bca97fb294f79 100644
--- a/test/parallel/test-dgram-bind.js
+++ b/test/parallel/test-dgram-bind.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dgram = require('dgram');
 
diff --git a/test/parallel/test-dgram-bytes-length.js b/test/parallel/test-dgram-bytes-length.js
index 9f8c39eb04daaf..c68b2fab70aff5 100644
--- a/test/parallel/test-dgram-bytes-length.js
+++ b/test/parallel/test-dgram-bytes-length.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dgram = require('dgram');
 
diff --git a/test/parallel/test-dgram-listen-after-bind.js b/test/parallel/test-dgram-listen-after-bind.js
index 2aac7ae9cf7588..498a17a0e5b053 100644
--- a/test/parallel/test-dgram-listen-after-bind.js
+++ b/test/parallel/test-dgram-listen-after-bind.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dgram = require('dgram');
 
diff --git a/test/parallel/test-dgram-ref.js b/test/parallel/test-dgram-ref.js
index d689a45e36dfa2..6505ce9b1ec886 100644
--- a/test/parallel/test-dgram-ref.js
+++ b/test/parallel/test-dgram-ref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var dgram = require('dgram');
 
 // should not hang, see #1282
diff --git a/test/parallel/test-dgram-regress-4496.js b/test/parallel/test-dgram-regress-4496.js
index fcb8d026bc547e..4bdd0d6520d7dc 100644
--- a/test/parallel/test-dgram-regress-4496.js
+++ b/test/parallel/test-dgram-regress-4496.js
@@ -1,7 +1,7 @@
 'use strict';
 // Remove this test once we support sending strings.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dgram = require('dgram');
 
diff --git a/test/parallel/test-dgram-send-bad-arguments.js b/test/parallel/test-dgram-send-bad-arguments.js
index ccd10e00555384..ddaa162c8bff10 100644
--- a/test/parallel/test-dgram-send-bad-arguments.js
+++ b/test/parallel/test-dgram-send-bad-arguments.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dgram = require('dgram');
 
diff --git a/test/parallel/test-dgram-unref.js b/test/parallel/test-dgram-unref.js
index 2add3d28c49760..083dab6d29589c 100644
--- a/test/parallel/test-dgram-unref.js
+++ b/test/parallel/test-dgram-unref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var dgram = require('dgram');
diff --git a/test/parallel/test-dh-padding.js b/test/parallel/test-dh-padding.js
index cdb1fc75f94215..7d482b78f63a7c 100644
--- a/test/parallel/test-dh-padding.js
+++ b/test/parallel/test-dh-padding.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 try {
diff --git a/test/parallel/test-dns-cares-domains.js b/test/parallel/test-dns-cares-domains.js
index cb651c5f5afb86..a1aa18a10f88ec 100644
--- a/test/parallel/test-dns-cares-domains.js
+++ b/test/parallel/test-dns-cares-domains.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dns = require('dns');
 var domain = require('domain');
diff --git a/test/parallel/test-dns-lookup-cb-error.js b/test/parallel/test-dns-lookup-cb-error.js
index 330dfb5d57092a..4a3dd2694121f8 100644
--- a/test/parallel/test-dns-lookup-cb-error.js
+++ b/test/parallel/test-dns-lookup-cb-error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cares = process.binding('cares_wrap');
 
diff --git a/test/parallel/test-dns-regress-7070.js b/test/parallel/test-dns-regress-7070.js
index 1fbd7f07a9d520..e696327d4d5f66 100644
--- a/test/parallel/test-dns-regress-7070.js
+++ b/test/parallel/test-dns-regress-7070.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var dns = require('dns');
 
diff --git a/test/parallel/test-dns.js b/test/parallel/test-dns.js
index abc7edbf598097..3362e8c534eaab 100644
--- a/test/parallel/test-dns.js
+++ b/test/parallel/test-dns.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var dns = require('dns');
diff --git a/test/parallel/test-domain-exit-dispose.js b/test/parallel/test-domain-exit-dispose.js
index 90e7210ce21aea..2bddb01cbd8ca5 100644
--- a/test/parallel/test-domain-exit-dispose.js
+++ b/test/parallel/test-domain-exit-dispose.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var disposalFailed = false;
diff --git a/test/parallel/test-domain-from-timer.js b/test/parallel/test-domain-from-timer.js
index 93661b419b0bbf..f0115018ec1879 100644
--- a/test/parallel/test-domain-from-timer.js
+++ b/test/parallel/test-domain-from-timer.js
@@ -1,7 +1,7 @@
 'use strict';
 // Simple tests of most basic domain functionality.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // timeouts call the callback directly from cc, so need to make sure the
diff --git a/test/parallel/test-domain-implicit-fs.js b/test/parallel/test-domain-implicit-fs.js
index fd21dcafe0858f..f35647b525c5c7 100644
--- a/test/parallel/test-domain-implicit-fs.js
+++ b/test/parallel/test-domain-implicit-fs.js
@@ -1,7 +1,7 @@
 'use strict';
 // Simple tests of most basic domain functionality.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var events = require('events');
diff --git a/test/parallel/test-domain-nested-throw.js b/test/parallel/test-domain-nested-throw.js
index 0fba3001b543fb..69a80b7ab104d0 100644
--- a/test/parallel/test-domain-nested-throw.js
+++ b/test/parallel/test-domain-nested-throw.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var domain = require('domain');
diff --git a/test/parallel/test-domain-stack.js b/test/parallel/test-domain-stack.js
index f9b5648a6619a7..6f4d03ca5a5e1f 100644
--- a/test/parallel/test-domain-stack.js
+++ b/test/parallel/test-domain-stack.js
@@ -1,7 +1,7 @@
 'use strict';
 // Make sure that the domain stack doesn't get out of hand.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var events = require('events');
diff --git a/test/parallel/test-domain-timers.js b/test/parallel/test-domain-timers.js
index 7530c9edba40b1..a97b300da02d31 100644
--- a/test/parallel/test-domain-timers.js
+++ b/test/parallel/test-domain-timers.js
@@ -1,7 +1,7 @@
 'use strict';
+require('../common');
 var domain = require('domain');
 var assert = require('assert');
-var common = require('../common');
 
 var timeout_err, timeout, immediate_err;
 
diff --git a/test/parallel/test-domain-top-level-error-handler-throw.js b/test/parallel/test-domain-top-level-error-handler-throw.js
index 8f63c94295a845..4bde30d17cb8c8 100644
--- a/test/parallel/test-domain-top-level-error-handler-throw.js
+++ b/test/parallel/test-domain-top-level-error-handler-throw.js
@@ -7,7 +7,7 @@
  * top-level error handler, not the one from the previous error.
  */
 
-const common = require('../common');
+require('../common');
 
 const domainErrHandlerExMessage = 'exception from domain error handler';
 const internalExMessage = 'You should NOT see me';
diff --git a/test/parallel/test-domain.js b/test/parallel/test-domain.js
index 918e3288e8dc91..bef5e942e057a1 100644
--- a/test/parallel/test-domain.js
+++ b/test/parallel/test-domain.js
@@ -1,7 +1,7 @@
 'use strict';
 // Simple tests of most basic domain functionality.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 var events = require('events');
diff --git a/test/parallel/test-event-emitter-add-listeners.js b/test/parallel/test-event-emitter-add-listeners.js
index cc30fd24add340..82acd65c585880 100644
--- a/test/parallel/test-event-emitter-add-listeners.js
+++ b/test/parallel/test-event-emitter-add-listeners.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-check-listener-leaks.js b/test/parallel/test-event-emitter-check-listener-leaks.js
index 90f686b5422c43..3c8260e787470a 100644
--- a/test/parallel/test-event-emitter-check-listener-leaks.js
+++ b/test/parallel/test-event-emitter-check-listener-leaks.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-get-max-listeners.js b/test/parallel/test-event-emitter-get-max-listeners.js
index 43a14db0cca362..34ffee3600e5e9 100644
--- a/test/parallel/test-event-emitter-get-max-listeners.js
+++ b/test/parallel/test-event-emitter-get-max-listeners.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var EventEmitter = require('events');
 
diff --git a/test/parallel/test-event-emitter-listener-count.js b/test/parallel/test-event-emitter-listener-count.js
index c5b75c819d17f9..ebfed8b2ee33b1 100644
--- a/test/parallel/test-event-emitter-listener-count.js
+++ b/test/parallel/test-event-emitter-listener-count.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const EventEmitter = require('events');
 
diff --git a/test/parallel/test-event-emitter-listeners-side-effects.js b/test/parallel/test-event-emitter-listeners-side-effects.js
index 23076128eddfc1..8f40d88f34486e 100644
--- a/test/parallel/test-event-emitter-listeners-side-effects.js
+++ b/test/parallel/test-event-emitter-listeners-side-effects.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-listeners.js b/test/parallel/test-event-emitter-listeners.js
index 48a60609e7be88..77c44907b62d8c 100644
--- a/test/parallel/test-event-emitter-listeners.js
+++ b/test/parallel/test-event-emitter-listeners.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-max-listeners.js b/test/parallel/test-event-emitter-max-listeners.js
index 5e754698d0a018..7d80c7a32fe0c4 100644
--- a/test/parallel/test-event-emitter-max-listeners.js
+++ b/test/parallel/test-event-emitter-max-listeners.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-method-names.js b/test/parallel/test-event-emitter-method-names.js
index a260aa779855aa..c1e6540f0184af 100644
--- a/test/parallel/test-event-emitter-method-names.js
+++ b/test/parallel/test-event-emitter-method-names.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-modify-in-emit.js b/test/parallel/test-event-emitter-modify-in-emit.js
index 85845cc4443b32..cd1849201dfe47 100644
--- a/test/parallel/test-event-emitter-modify-in-emit.js
+++ b/test/parallel/test-event-emitter-modify-in-emit.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-no-error-provided-to-error-event.js b/test/parallel/test-event-emitter-no-error-provided-to-error-event.js
index e85361475f894e..918ba195d4be18 100644
--- a/test/parallel/test-event-emitter-no-error-provided-to-error-event.js
+++ b/test/parallel/test-event-emitter-no-error-provided-to-error-event.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 var domain = require('domain');
diff --git a/test/parallel/test-event-emitter-num-args.js b/test/parallel/test-event-emitter-num-args.js
index 6c403cd2f294ae..51f57e89bc6e22 100644
--- a/test/parallel/test-event-emitter-num-args.js
+++ b/test/parallel/test-event-emitter-num-args.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-once.js b/test/parallel/test-event-emitter-once.js
index 1085e7942a59bf..d007ef663fdede 100644
--- a/test/parallel/test-event-emitter-once.js
+++ b/test/parallel/test-event-emitter-once.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-set-max-listeners-side-effects.js b/test/parallel/test-event-emitter-set-max-listeners-side-effects.js
index f09f130ab489ed..11cfab0bb876c6 100644
--- a/test/parallel/test-event-emitter-set-max-listeners-side-effects.js
+++ b/test/parallel/test-event-emitter-set-max-listeners-side-effects.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var events = require('events');
 
diff --git a/test/parallel/test-event-emitter-subclass.js b/test/parallel/test-event-emitter-subclass.js
index fe915be34efc2b..02309241514683 100644
--- a/test/parallel/test-event-emitter-subclass.js
+++ b/test/parallel/test-event-emitter-subclass.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
diff --git a/test/parallel/test-exception-handler.js b/test/parallel/test-exception-handler.js
index 9cc8106ea6f80a..735daa51070014 100644
--- a/test/parallel/test-exception-handler.js
+++ b/test/parallel/test-exception-handler.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var MESSAGE = 'catch me if you can';
diff --git a/test/parallel/test-exception-handler2.js b/test/parallel/test-exception-handler2.js
index 58e84ad21ba4ee..3ed2c9520461f8 100644
--- a/test/parallel/test-exception-handler2.js
+++ b/test/parallel/test-exception-handler2.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 process.on('uncaughtException', function(err) {
diff --git a/test/parallel/test-exec-max-buffer.js b/test/parallel/test-exec-max-buffer.js
index 5cae35b69f95d5..15c6e7025978e2 100644
--- a/test/parallel/test-exec-max-buffer.js
+++ b/test/parallel/test-exec-max-buffer.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var exec = require('child_process').exec;
 var assert = require('assert');
 
diff --git a/test/parallel/test-fs-exists.js b/test/parallel/test-fs-exists.js
index fcbd729a5ed850..3474fc4cb9ff2b 100644
--- a/test/parallel/test-fs-exists.js
+++ b/test/parallel/test-fs-exists.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 var f = __filename;
diff --git a/test/parallel/test-fs-make-callback.js b/test/parallel/test-fs-make-callback.js
index a15a16404df003..4fbe64437eaff0 100644
--- a/test/parallel/test-fs-make-callback.js
+++ b/test/parallel/test-fs-make-callback.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 
diff --git a/test/parallel/test-fs-open-flags.js b/test/parallel/test-fs-open-flags.js
index c7d53117d587fc..b53a823603d0fc 100644
--- a/test/parallel/test-fs-open-flags.js
+++ b/test/parallel/test-fs-open-flags.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var constants = require('constants');
diff --git a/test/parallel/test-fs-open.js b/test/parallel/test-fs-open.js
index 59b605841b4440..0a069b9a0bafda 100644
--- a/test/parallel/test-fs-open.js
+++ b/test/parallel/test-fs-open.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var constants = require('constants');
-var common = require('../common');
 var assert = require('assert');
 var fs = require('fs');
 
diff --git a/test/parallel/test-fs-read-file-sync-hostname.js b/test/parallel/test-fs-read-file-sync-hostname.js
index c5c5264c0dde3b..de105737969865 100644
--- a/test/parallel/test-fs-read-file-sync-hostname.js
+++ b/test/parallel/test-fs-read-file-sync-hostname.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 
diff --git a/test/parallel/test-fs-readfile-zero-byte-liar.js b/test/parallel/test-fs-readfile-zero-byte-liar.js
index 2c9c6e3db9a584..a81b055494d3d2 100644
--- a/test/parallel/test-fs-readfile-zero-byte-liar.js
+++ b/test/parallel/test-fs-readfile-zero-byte-liar.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 
diff --git a/test/parallel/test-fs-stat.js b/test/parallel/test-fs-stat.js
index 123d6608b4bb4f..1affdec6260c0d 100644
--- a/test/parallel/test-fs-stat.js
+++ b/test/parallel/test-fs-stat.js
@@ -1,5 +1,5 @@
 /* eslint-disable strict */
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 var got_error = false;
diff --git a/test/parallel/test-fs-sync-fd-leak.js b/test/parallel/test-fs-sync-fd-leak.js
index 5f2b63125a1d0f..f7cfd25f4b9b4c 100644
--- a/test/parallel/test-fs-sync-fd-leak.js
+++ b/test/parallel/test-fs-sync-fd-leak.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 
diff --git a/test/parallel/test-fs-write-no-fd.js b/test/parallel/test-fs-write-no-fd.js
index 5b38ce6ba814c4..eb0ed5caeb6612 100644
--- a/test/parallel/test-fs-write-no-fd.js
+++ b/test/parallel/test-fs-write-no-fd.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const fs = require('fs');
 const assert = require('assert');
 
diff --git a/test/parallel/test-handle-wrap-close-abort.js b/test/parallel/test-handle-wrap-close-abort.js
index 8e2388fa84d809..8572668f666864 100644
--- a/test/parallel/test-handle-wrap-close-abort.js
+++ b/test/parallel/test-handle-wrap-close-abort.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 
 process.on('uncaughtException', function() { });
 
diff --git a/test/parallel/test-http-agent-false.js b/test/parallel/test-http-agent-false.js
index ad8de89f2038e9..96606028bf7a45 100644
--- a/test/parallel/test-http-agent-false.js
+++ b/test/parallel/test-http-agent-false.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var http = require('http');
 
diff --git a/test/parallel/test-http-agent-getname.js b/test/parallel/test-http-agent-getname.js
index d8d30a8ddbc25c..1b80b5c36e1e64 100644
--- a/test/parallel/test-http-agent-getname.js
+++ b/test/parallel/test-http-agent-getname.js
@@ -1,8 +1,8 @@
 'use strict';
 
+require('../common');
 var assert = require('assert');
 var http = require('http');
-var common = require('../common');
 
 var agent = new http.Agent();
 
diff --git a/test/parallel/test-http-client-readable.js b/test/parallel/test-http-client-readable.js
index ba9fdd658c3864..8328afb01c6478 100644
--- a/test/parallel/test-http-client-readable.js
+++ b/test/parallel/test-http-client-readable.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var http = require('http');
 var util = require('util');
diff --git a/test/parallel/test-http-methods.js b/test/parallel/test-http-methods.js
index 348fd2e519ef64..62a4187841bdbc 100644
--- a/test/parallel/test-http-methods.js
+++ b/test/parallel/test-http-methods.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var http = require('http');
 var util = require('util');
diff --git a/test/parallel/test-http-parser-bad-ref.js b/test/parallel/test-http-parser-bad-ref.js
index d409dc62d008d9..545a9c1fef11c4 100644
--- a/test/parallel/test-http-parser-bad-ref.js
+++ b/test/parallel/test-http-parser-bad-ref.js
@@ -4,7 +4,7 @@
 
 // Flags: --expose_gc
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var HTTPParser = process.binding('http_parser').HTTPParser;
 
diff --git a/test/parallel/test-http-parser.js b/test/parallel/test-http-parser.js
index bb004f864cf468..f10f3ac26b4b10 100644
--- a/test/parallel/test-http-parser.js
+++ b/test/parallel/test-http-parser.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var HTTPParser = process.binding('http_parser').HTTPParser;
diff --git a/test/parallel/test-http-url.parse-only-support-http-https-protocol.js b/test/parallel/test-http-url.parse-only-support-http-https-protocol.js
index 8402517db267ed..e7ed82817146ea 100644
--- a/test/parallel/test-http-url.parse-only-support-http-https-protocol.js
+++ b/test/parallel/test-http-url.parse-only-support-http-https-protocol.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var http = require('http');
 var url = require('url');
diff --git a/test/parallel/test-internal-modules-expose.js b/test/parallel/test-internal-modules-expose.js
index 4ece1d0c7b6f29..ed3cecb6f29719 100644
--- a/test/parallel/test-internal-modules-expose.js
+++ b/test/parallel/test-internal-modules-expose.js
@@ -1,7 +1,7 @@
 'use strict';
 // Flags: --expose_internals
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert.equal(typeof require('internal/freelist').FreeList, 'function');
diff --git a/test/parallel/test-internal-modules.js b/test/parallel/test-internal-modules.js
index 011b6f7132e9bf..5d93a381c7acdf 100644
--- a/test/parallel/test-internal-modules.js
+++ b/test/parallel/test-internal-modules.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert.throws(function() {
diff --git a/test/parallel/test-intl.js b/test/parallel/test-intl.js
index 7288febf9e6bfd..1219c330386ca5 100644
--- a/test/parallel/test-intl.js
+++ b/test/parallel/test-intl.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // does node think that i18n was enabled?
diff --git a/test/parallel/test-js-stream-call-properties.js b/test/parallel/test-js-stream-call-properties.js
index c6b1adb3cb7a7a..280e5d9dabee66 100644
--- a/test/parallel/test-js-stream-call-properties.js
+++ b/test/parallel/test-js-stream-call-properties.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const util = require('util');
 const JSStream = process.binding('js_stream').JSStream;
 
diff --git a/test/parallel/test-memory-usage.js b/test/parallel/test-memory-usage.js
index 8394fc16599ef3..9b39601e2e20b3 100644
--- a/test/parallel/test-memory-usage.js
+++ b/test/parallel/test-memory-usage.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var r = process.memoryUsage();
diff --git a/test/parallel/test-microtask-queue-integration-domain.js b/test/parallel/test-microtask-queue-integration-domain.js
index 7a4ad77cd321e3..89697ef7f711bb 100644
--- a/test/parallel/test-microtask-queue-integration-domain.js
+++ b/test/parallel/test-microtask-queue-integration-domain.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 
diff --git a/test/parallel/test-microtask-queue-integration.js b/test/parallel/test-microtask-queue-integration.js
index 37de5ee33b1477..fe873d27c91447 100644
--- a/test/parallel/test-microtask-queue-integration.js
+++ b/test/parallel/test-microtask-queue-integration.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var implementations = [
diff --git a/test/parallel/test-microtask-queue-run-domain.js b/test/parallel/test-microtask-queue-run-domain.js
index 77534920ff1451..3e35cea15ed9dc 100644
--- a/test/parallel/test-microtask-queue-run-domain.js
+++ b/test/parallel/test-microtask-queue-run-domain.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 
diff --git a/test/parallel/test-microtask-queue-run-immediate-domain.js b/test/parallel/test-microtask-queue-run-immediate-domain.js
index 2dea0a76cc1bf4..5ce3ec59b6731b 100644
--- a/test/parallel/test-microtask-queue-run-immediate-domain.js
+++ b/test/parallel/test-microtask-queue-run-immediate-domain.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var domain = require('domain');
 
diff --git a/test/parallel/test-microtask-queue-run-immediate.js b/test/parallel/test-microtask-queue-run-immediate.js
index cfd9cd3659ef00..479062ad4710f4 100644
--- a/test/parallel/test-microtask-queue-run-immediate.js
+++ b/test/parallel/test-microtask-queue-run-immediate.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 function enqueueMicrotask(fn) {
diff --git a/test/parallel/test-microtask-queue-run.js b/test/parallel/test-microtask-queue-run.js
index ca758546c2bcfd..ce743d93003249 100644
--- a/test/parallel/test-microtask-queue-run.js
+++ b/test/parallel/test-microtask-queue-run.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 function enqueueMicrotask(fn) {
diff --git a/test/parallel/test-module-loading-error.js b/test/parallel/test-module-loading-error.js
index e67c53fc3b076a..072a6aadcb8c62 100644
--- a/test/parallel/test-module-loading-error.js
+++ b/test/parallel/test-module-loading-error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 console.error('load test-module-loading-error.js');
diff --git a/test/parallel/test-net-dns-error.js b/test/parallel/test-net-dns-error.js
index 17f251cec3b6af..fc27eb1b9b0751 100644
--- a/test/parallel/test-net-dns-error.js
+++ b/test/parallel/test-net-dns-error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var net = require('net');
diff --git a/test/parallel/test-net-end-without-connect.js b/test/parallel/test-net-end-without-connect.js
index 2911591f9f486d..69abf486316ff2 100644
--- a/test/parallel/test-net-end-without-connect.js
+++ b/test/parallel/test-net-end-without-connect.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var net = require('net');
 
 var sock = new net.Socket();
diff --git a/test/parallel/test-net-isip.js b/test/parallel/test-net-isip.js
index 96177122b7ba21..76432ed3488240 100644
--- a/test/parallel/test-net-isip.js
+++ b/test/parallel/test-net-isip.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var net = require('net');
 
diff --git a/test/parallel/test-net-listen-error.js b/test/parallel/test-net-listen-error.js
index 79cfc7da6c9255..4c4d27d703a9a6 100644
--- a/test/parallel/test-net-listen-error.js
+++ b/test/parallel/test-net-listen-error.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var net = require('net');
 var gotError = false;
diff --git a/test/parallel/test-net-server-connections.js b/test/parallel/test-net-server-connections.js
index 138a78defb260d..ae89d9aac7b3f7 100644
--- a/test/parallel/test-net-server-connections.js
+++ b/test/parallel/test-net-server-connections.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var net = require('net');
diff --git a/test/parallel/test-net-server-unref-persistent.js b/test/parallel/test-net-server-unref-persistent.js
index a071b625ef26d7..8e8f45f5fd7d20 100644
--- a/test/parallel/test-net-server-unref-persistent.js
+++ b/test/parallel/test-net-server-unref-persistent.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var net = require('net');
 var closed = false;
diff --git a/test/parallel/test-next-tick-domain.js b/test/parallel/test-next-tick-domain.js
index 4d53bba6c4f5cc..8f9d9bb4aa50f7 100644
--- a/test/parallel/test-next-tick-domain.js
+++ b/test/parallel/test-next-tick-domain.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var origNextTick = process.nextTick;
diff --git a/test/parallel/test-next-tick-errors.js b/test/parallel/test-next-tick-errors.js
index 8e1bc52decea7c..6b854e82372187 100644
--- a/test/parallel/test-next-tick-errors.js
+++ b/test/parallel/test-next-tick-errors.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var order = [],
diff --git a/test/parallel/test-next-tick-intentional-starvation.js b/test/parallel/test-next-tick-intentional-starvation.js
index d4a8a1b7481329..414524e5405ecc 100644
--- a/test/parallel/test-next-tick-intentional-starvation.js
+++ b/test/parallel/test-next-tick-intentional-starvation.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // this is the inverse of test-next-tick-starvation.
diff --git a/test/parallel/test-next-tick-ordering.js b/test/parallel/test-next-tick-ordering.js
index c2b936a1061d52..63f8d37828e53c 100644
--- a/test/parallel/test-next-tick-ordering.js
+++ b/test/parallel/test-next-tick-ordering.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var i;
 
diff --git a/test/parallel/test-next-tick-ordering2.js b/test/parallel/test-next-tick-ordering2.js
index 4252d623679f65..70f7611dbaddae 100644
--- a/test/parallel/test-next-tick-ordering2.js
+++ b/test/parallel/test-next-tick-ordering2.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var order = [];
diff --git a/test/parallel/test-next-tick.js b/test/parallel/test-next-tick.js
index 54e7b88cf022ca..8b45e8c705fc84 100644
--- a/test/parallel/test-next-tick.js
+++ b/test/parallel/test-next-tick.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var complete = 0;
diff --git a/test/parallel/test-path-zero-length-strings.js b/test/parallel/test-path-zero-length-strings.js
index 083eb3e7ac03c6..07de030aa0b323 100644
--- a/test/parallel/test-path-zero-length-strings.js
+++ b/test/parallel/test-path-zero-length-strings.js
@@ -5,7 +5,7 @@
 // directory. This test makes sure that the behaviour is intact between commits.
 // See: https://github.com/nodejs/node/pull/2106
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const path = require('path');
 const pwd = process.cwd();
diff --git a/test/parallel/test-pipe-return-val.js b/test/parallel/test-pipe-return-val.js
index 2e27d07c19e9cf..eab5db8f70cf92 100644
--- a/test/parallel/test-pipe-return-val.js
+++ b/test/parallel/test-pipe-return-val.js
@@ -1,7 +1,7 @@
 'use strict';
 // This test ensures SourceStream.pipe(DestStream) returns DestStream
 
-var common = require('../common');
+require('../common');
 var Stream = require('stream').Stream;
 var assert = require('assert');
 
diff --git a/test/parallel/test-preload.js b/test/parallel/test-preload.js
index b4a3af78d8df3b..c1d92c7818abb3 100644
--- a/test/parallel/test-preload.js
+++ b/test/parallel/test-preload.js
@@ -1,6 +1,6 @@
 'use strict';
-var common = require('../common'),
-    assert = require('assert'),
+require('../common');
+var assert = require('assert'),
     path = require('path'),
     child_process = require('child_process');
 
diff --git a/test/parallel/test-process-before-exit.js b/test/parallel/test-process-before-exit.js
index eff96da98e4729..5d8855869a8e4a 100644
--- a/test/parallel/test-process-before-exit.js
+++ b/test/parallel/test-process-before-exit.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 
 var N = 5;
 var n = 0;
diff --git a/test/parallel/test-process-config.js b/test/parallel/test-process-config.js
index 4fc3bcaa98afc8..cedd773dfbeaeb 100644
--- a/test/parallel/test-process-config.js
+++ b/test/parallel/test-process-config.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var fs = require('fs');
 var path = require('path');
diff --git a/test/parallel/test-process-env.js b/test/parallel/test-process-env.js
index 7e927d09bae668..932bae3f8ff095 100644
--- a/test/parallel/test-process-env.js
+++ b/test/parallel/test-process-env.js
@@ -4,7 +4,7 @@
 // first things first, set the timezone; see tzset(3)
 process.env.TZ = 'Europe/Amsterdam';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var spawn = require('child_process').spawn;
 
diff --git a/test/parallel/test-process-exit-code.js b/test/parallel/test-process-exit-code.js
index fea8c2d4fcdc5d..8d657528d05561 100644
--- a/test/parallel/test-process-exit-code.js
+++ b/test/parallel/test-process-exit-code.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 switch (process.argv[2]) {
diff --git a/test/parallel/test-process-exit.js b/test/parallel/test-process-exit.js
index 999eefc1eff518..0ea36f158eaf9b 100644
--- a/test/parallel/test-process-exit.js
+++ b/test/parallel/test-process-exit.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // calling .exit() from within "exit" should not overflow the call stack
diff --git a/test/parallel/test-process-getactiverequests.js b/test/parallel/test-process-getactiverequests.js
index 4b7e0df1a50240..30773f8f11380a 100644
--- a/test/parallel/test-process-getactiverequests.js
+++ b/test/parallel/test-process-getactiverequests.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const fs = require('fs');
 
diff --git a/test/parallel/test-process-getgroups.js b/test/parallel/test-process-getgroups.js
index b18b5a0f2f90d4..08eab8d5a8afe2 100644
--- a/test/parallel/test-process-getgroups.js
+++ b/test/parallel/test-process-getgroups.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var exec = require('child_process').exec;
 
diff --git a/test/parallel/test-process-hrtime.js b/test/parallel/test-process-hrtime.js
index 0e2c5b110e9292..ad186a3507d1e7 100644
--- a/test/parallel/test-process-hrtime.js
+++ b/test/parallel/test-process-hrtime.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // the default behavior, return an Array "tuple" of numbers
diff --git a/test/parallel/test-process-kill-null.js b/test/parallel/test-process-kill-null.js
index 65dab752f12e6d..2516773f08786a 100644
--- a/test/parallel/test-process-kill-null.js
+++ b/test/parallel/test-process-kill-null.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var spawn = require('child_process').spawn;
 
diff --git a/test/parallel/test-process-kill-pid.js b/test/parallel/test-process-kill-pid.js
index f193e979166da7..5c11be2903c4a7 100644
--- a/test/parallel/test-process-kill-pid.js
+++ b/test/parallel/test-process-kill-pid.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // test variants of pid
diff --git a/test/parallel/test-process-next-tick.js b/test/parallel/test-process-next-tick.js
index e7b5f8f3fe886e..6b20cfbe93377b 100644
--- a/test/parallel/test-process-next-tick.js
+++ b/test/parallel/test-process-next-tick.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var N = 2;
 var tickCount = 0;
diff --git a/test/parallel/test-process-raw-debug.js b/test/parallel/test-process-raw-debug.js
index f849457d643894..ab461902911a93 100644
--- a/test/parallel/test-process-raw-debug.js
+++ b/test/parallel/test-process-raw-debug.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var os = require('os');
 
diff --git a/test/parallel/test-process-wrap.js b/test/parallel/test-process-wrap.js
index bf3dfe4e8b1651..b5d4dc35e4fe00 100644
--- a/test/parallel/test-process-wrap.js
+++ b/test/parallel/test-process-wrap.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Process = process.binding('process_wrap').Process;
 var Pipe = process.binding('pipe_wrap').Pipe;
diff --git a/test/parallel/test-punycode.js b/test/parallel/test-punycode.js
index 179bca51ec2fe0..42927549eae395 100644
--- a/test/parallel/test-punycode.js
+++ b/test/parallel/test-punycode.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var punycode = require('punycode');
 var assert = require('assert');
 
diff --git a/test/parallel/test-querystring-multichar-separator.js b/test/parallel/test-querystring-multichar-separator.js
index 257492659bdfde..488b5ac56aefa0 100644
--- a/test/parallel/test-querystring-multichar-separator.js
+++ b/test/parallel/test-querystring-multichar-separator.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const qs = require('querystring');
 
diff --git a/test/parallel/test-querystring.js b/test/parallel/test-querystring.js
index 66497ac2d3b6db..bb3c361f882a14 100644
--- a/test/parallel/test-querystring.js
+++ b/test/parallel/test-querystring.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // test using assert
diff --git a/test/parallel/test-readdouble.js b/test/parallel/test-readdouble.js
index c0dab8956593fe..6c55a65007aa88 100644
--- a/test/parallel/test-readdouble.js
+++ b/test/parallel/test-readdouble.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're reading in doubles correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 /*
diff --git a/test/parallel/test-readfloat.js b/test/parallel/test-readfloat.js
index 5572bbf18e291b..468faf76029613 100644
--- a/test/parallel/test-readfloat.js
+++ b/test/parallel/test-readfloat.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're reading in floats correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 /*
diff --git a/test/parallel/test-readint.js b/test/parallel/test-readint.js
index 233128d792d068..b3997f74f17721 100644
--- a/test/parallel/test-readint.js
+++ b/test/parallel/test-readint.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're reading in signed integers correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 /*
diff --git a/test/parallel/test-readuint.js b/test/parallel/test-readuint.js
index b984541bfe9eb0..154af1841a98cd 100644
--- a/test/parallel/test-readuint.js
+++ b/test/parallel/test-readuint.js
@@ -3,7 +3,7 @@
  * A battery of tests to help us read a series of uints
  */
 
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 /*
diff --git a/test/parallel/test-ref-unref-return.js b/test/parallel/test-ref-unref-return.js
index a82a433ab1af05..89ac52d2bcaa50 100644
--- a/test/parallel/test-ref-unref-return.js
+++ b/test/parallel/test-ref-unref-return.js
@@ -1,8 +1,8 @@
 'use strict';
+require('../common');
 var assert = require('assert');
 var net = require('net');
 var dgram = require('dgram');
-var common = require('../common');
 
 assert.ok((new net.Server()).ref() instanceof net.Server);
 assert.ok((new net.Server()).unref() instanceof net.Server);
diff --git a/test/parallel/test-regress-GH-6235.js b/test/parallel/test-regress-GH-6235.js
index 2f2f17d9698fc9..0bf9b8965d1184 100644
--- a/test/parallel/test-regress-GH-6235.js
+++ b/test/parallel/test-regress-GH-6235.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert.doesNotThrow(function() {
diff --git a/test/parallel/test-regress-GH-7511.js b/test/parallel/test-regress-GH-7511.js
index 0e5c4ded011a43..03813dea003eaf 100644
--- a/test/parallel/test-regress-GH-7511.js
+++ b/test/parallel/test-regress-GH-7511.js
@@ -1,6 +1,6 @@
 'use strict';
-var common = require('../common'),
-    assert = require('assert'),
+require('../common');
+var assert = require('assert'),
     vm     = require('vm');
 
 assert.doesNotThrow(function() {
diff --git a/test/parallel/test-regress-GH-897.js b/test/parallel/test-regress-GH-897.js
index 4b7ba61f9ceca9..1b46994dc37d94 100644
--- a/test/parallel/test-regress-GH-897.js
+++ b/test/parallel/test-regress-GH-897.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var t = Date.now();
diff --git a/test/parallel/test-repl-envvars.js b/test/parallel/test-repl-envvars.js
index 6073144085843d..2c34bbf2da86fa 100644
--- a/test/parallel/test-repl-envvars.js
+++ b/test/parallel/test-repl-envvars.js
@@ -2,7 +2,7 @@
 
 // Flags: --expose-internals
 
-const common = require('../common');
+require('../common');
 const stream = require('stream');
 const REPL = require('internal/repl');
 const assert = require('assert');
diff --git a/test/parallel/test-repl-harmony.js b/test/parallel/test-repl-harmony.js
index 6bc5cb57aa1187..a5928800381cfe 100644
--- a/test/parallel/test-repl-harmony.js
+++ b/test/parallel/test-repl-harmony.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/parallel/test-repl-require-cache.js b/test/parallel/test-repl-require-cache.js
index d9b4d71d484640..c5f317ac268e2f 100644
--- a/test/parallel/test-repl-require-cache.js
+++ b/test/parallel/test-repl-require-cache.js
@@ -1,6 +1,6 @@
 'use strict';
-var common = require('../common'),
-    assert = require('assert'),
+require('../common');
+var assert = require('assert'),
     repl = require('repl');
 
 // https://github.com/joyent/node/issues/3226
diff --git a/test/parallel/test-repl-setprompt.js b/test/parallel/test-repl-setprompt.js
index f2c65583b3656b..2708a3e6af5448 100644
--- a/test/parallel/test-repl-setprompt.js
+++ b/test/parallel/test-repl-setprompt.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const spawn = require('child_process').spawn;
 const os = require('os');
diff --git a/test/parallel/test-repl-syntax-error-handling.js b/test/parallel/test-repl-syntax-error-handling.js
index 66e8fb6b352c56..10166b4f06a692 100644
--- a/test/parallel/test-repl-syntax-error-handling.js
+++ b/test/parallel/test-repl-syntax-error-handling.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 switch (process.argv[2]) {
diff --git a/test/parallel/test-repl-unexpected-token-recoverable.js b/test/parallel/test-repl-unexpected-token-recoverable.js
index 4cfaa5136b6a55..84668c8657c453 100644
--- a/test/parallel/test-repl-unexpected-token-recoverable.js
+++ b/test/parallel/test-repl-unexpected-token-recoverable.js
@@ -2,7 +2,7 @@
 /*
  * This is a regression test for https://github.com/joyent/node/issues/8874.
  */
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/parallel/test-require-cache.js b/test/parallel/test-require-cache.js
index f2245345e3e4bd..7ea68dd0515799 100644
--- a/test/parallel/test-require-cache.js
+++ b/test/parallel/test-require-cache.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 (function testInjectFakeModule() {
diff --git a/test/parallel/test-signal-safety.js b/test/parallel/test-signal-safety.js
index 549c26662f717a..7938ae04d6591b 100644
--- a/test/parallel/test-signal-safety.js
+++ b/test/parallel/test-signal-safety.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Signal = process.binding('signal_wrap').Signal;
 
diff --git a/test/parallel/test-stdin-hang.js b/test/parallel/test-stdin-hang.js
index 4818a9ee952026..bb43d52506e5dc 100644
--- a/test/parallel/test-stdin-hang.js
+++ b/test/parallel/test-stdin-hang.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 
 // This test *only* verifies that invoking the stdin getter does not
 // cause node to hang indefinitely.
diff --git a/test/parallel/test-stdio-readable-writable.js b/test/parallel/test-stdio-readable-writable.js
index f8a8923498cb03..7b9b69d309aec5 100644
--- a/test/parallel/test-stdio-readable-writable.js
+++ b/test/parallel/test-stdio-readable-writable.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert(process.stdout.writable);
diff --git a/test/parallel/test-stdout-close-unref.js b/test/parallel/test-stdout-close-unref.js
index 12a031562bf6f0..37ab4987eebcaa 100644
--- a/test/parallel/test-stdout-close-unref.js
+++ b/test/parallel/test-stdout-close-unref.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 
 var errs = 0;
 
diff --git a/test/parallel/test-stream-big-packet.js b/test/parallel/test-stream-big-packet.js
index a9f6064c7e7277..67bb32847bd7f7 100644
--- a/test/parallel/test-stream-big-packet.js
+++ b/test/parallel/test-stream-big-packet.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 var stream = require('stream');
diff --git a/test/parallel/test-stream-big-push.js b/test/parallel/test-stream-big-push.js
index e02ff98d3c7454..b46665efc94ff5 100644
--- a/test/parallel/test-stream-big-push.js
+++ b/test/parallel/test-stream-big-push.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var stream = require('stream');
 var str = 'asdfasdfasdfasdfasdf';
diff --git a/test/parallel/test-stream-duplex.js b/test/parallel/test-stream-duplex.js
index 0e8789d6bf5555..200de24877bf79 100644
--- a/test/parallel/test-stream-duplex.js
+++ b/test/parallel/test-stream-duplex.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Duplex = require('stream').Transform;
diff --git a/test/parallel/test-stream-end-paused.js b/test/parallel/test-stream-end-paused.js
index 585d6c327fd592..9cc32db880ea88 100644
--- a/test/parallel/test-stream-end-paused.js
+++ b/test/parallel/test-stream-end-paused.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var gotEnd = false;
 
diff --git a/test/parallel/test-stream-ispaused.js b/test/parallel/test-stream-ispaused.js
index 8112dc733a7205..38f8da3fd512e4 100644
--- a/test/parallel/test-stream-ispaused.js
+++ b/test/parallel/test-stream-ispaused.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 
 var stream = require('stream');
 
diff --git a/test/parallel/test-stream-pipe-after-end.js b/test/parallel/test-stream-pipe-after-end.js
index 4bead73f68ce5b..258c9330a96018 100644
--- a/test/parallel/test-stream-pipe-after-end.js
+++ b/test/parallel/test-stream-pipe-after-end.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('_stream_readable');
diff --git a/test/parallel/test-stream-pipe-cleanup.js b/test/parallel/test-stream-pipe-cleanup.js
index 08da96f92c3a0f..251695c9f723ab 100644
--- a/test/parallel/test-stream-pipe-cleanup.js
+++ b/test/parallel/test-stream-pipe-cleanup.js
@@ -2,7 +2,7 @@
 // This test asserts that Stream.prototype.pipe does not leave listeners
 // hanging on the source or dest.
 
-var common = require('../common');
+require('../common');
 var stream = require('stream');
 var assert = require('assert');
 var util = require('util');
diff --git a/test/parallel/test-stream-pipe-error-handling.js b/test/parallel/test-stream-pipe-error-handling.js
index 031a0da7e395db..8b674bffbd087b 100644
--- a/test/parallel/test-stream-pipe-error-handling.js
+++ b/test/parallel/test-stream-pipe-error-handling.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Stream = require('stream').Stream;
 
diff --git a/test/parallel/test-stream-pipe-event.js b/test/parallel/test-stream-pipe-event.js
index 0d10533b0c496a..d8601dd04a4d8e 100644
--- a/test/parallel/test-stream-pipe-event.js
+++ b/test/parallel/test-stream-pipe-event.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var stream = require('stream');
 var assert = require('assert');
 var util = require('util');
diff --git a/test/parallel/test-stream-push-order.js b/test/parallel/test-stream-push-order.js
index d67233aff7a498..0bbcdf522b28fa 100644
--- a/test/parallel/test-stream-push-order.js
+++ b/test/parallel/test-stream-push-order.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var Readable = require('stream').Readable;
 var assert = require('assert');
 
diff --git a/test/parallel/test-stream-push-strings.js b/test/parallel/test-stream-push-strings.js
index 0d9c0653c0dc66..21621ff3fd114f 100644
--- a/test/parallel/test-stream-push-strings.js
+++ b/test/parallel/test-stream-push-strings.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('stream').Readable;
diff --git a/test/parallel/test-stream-readable-constructor-set-methods.js b/test/parallel/test-stream-readable-constructor-set-methods.js
index 928ce31a8ebe7b..fb2114f44dad19 100644
--- a/test/parallel/test-stream-readable-constructor-set-methods.js
+++ b/test/parallel/test-stream-readable-constructor-set-methods.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('stream').Readable;
diff --git a/test/parallel/test-stream-readable-event.js b/test/parallel/test-stream-readable-event.js
index 965fc82c05a1d9..10d314f4eec254 100644
--- a/test/parallel/test-stream-readable-event.js
+++ b/test/parallel/test-stream-readable-event.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('stream').Readable;
diff --git a/test/parallel/test-stream-readable-flow-recursion.js b/test/parallel/test-stream-readable-flow-recursion.js
index 07edd579f1deea..57e295e5383550 100644
--- a/test/parallel/test-stream-readable-flow-recursion.js
+++ b/test/parallel/test-stream-readable-flow-recursion.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // this test verifies that passing a huge number to read(size)
diff --git a/test/parallel/test-stream-transform-constructor-set-methods.js b/test/parallel/test-stream-transform-constructor-set-methods.js
index c24c273b6f20e1..bf76b93690c840 100644
--- a/test/parallel/test-stream-transform-constructor-set-methods.js
+++ b/test/parallel/test-stream-transform-constructor-set-methods.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Transform = require('stream').Transform;
diff --git a/test/parallel/test-stream-transform-objectmode-falsey-value.js b/test/parallel/test-stream-transform-objectmode-falsey-value.js
index 762f0500ad3e60..eeb3d3f4ccc692 100644
--- a/test/parallel/test-stream-transform-objectmode-falsey-value.js
+++ b/test/parallel/test-stream-transform-objectmode-falsey-value.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var stream = require('stream');
diff --git a/test/parallel/test-stream-transform-split-objectmode.js b/test/parallel/test-stream-transform-split-objectmode.js
index 24833ece051e9e..4e33028da2f7de 100644
--- a/test/parallel/test-stream-transform-split-objectmode.js
+++ b/test/parallel/test-stream-transform-split-objectmode.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Transform = require('stream').Transform;
diff --git a/test/parallel/test-stream-unshift-empty-chunk.js b/test/parallel/test-stream-unshift-empty-chunk.js
index a7dcad425310b1..0da979e337486e 100644
--- a/test/parallel/test-stream-unshift-empty-chunk.js
+++ b/test/parallel/test-stream-unshift-empty-chunk.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // This test verifies that stream.unshift(Buffer(0)) or
diff --git a/test/parallel/test-stream-unshift-read-race.js b/test/parallel/test-stream-unshift-read-race.js
index 90f519b5b5d738..253427e3915103 100644
--- a/test/parallel/test-stream-unshift-read-race.js
+++ b/test/parallel/test-stream-unshift-read-race.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // This test verifies that:
diff --git a/test/parallel/test-stream-wrap.js b/test/parallel/test-stream-wrap.js
index e7a7ecddd2385d..5a8b75d4dc1f19 100644
--- a/test/parallel/test-stream-wrap.js
+++ b/test/parallel/test-stream-wrap.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 const StreamWrap = require('_stream_wrap');
diff --git a/test/parallel/test-stream-writable-change-default-encoding.js b/test/parallel/test-stream-writable-change-default-encoding.js
index a6fcda3e62a517..d8193123d6f3af 100644
--- a/test/parallel/test-stream-writable-change-default-encoding.js
+++ b/test/parallel/test-stream-writable-change-default-encoding.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var stream = require('stream');
diff --git a/test/parallel/test-stream-writable-constructor-set-methods.js b/test/parallel/test-stream-writable-constructor-set-methods.js
index 47fc458ce9713b..4a5f90216070c5 100644
--- a/test/parallel/test-stream-writable-constructor-set-methods.js
+++ b/test/parallel/test-stream-writable-constructor-set-methods.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Writable = require('stream').Writable;
diff --git a/test/parallel/test-stream-writable-decoded-encoding.js b/test/parallel/test-stream-writable-decoded-encoding.js
index b637838c0c65be..b5f1b4f6b73f49 100644
--- a/test/parallel/test-stream-writable-decoded-encoding.js
+++ b/test/parallel/test-stream-writable-decoded-encoding.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var stream = require('stream');
diff --git a/test/parallel/test-stream-writev.js b/test/parallel/test-stream-writev.js
index f73270f2ff53ba..88933508fb5246 100644
--- a/test/parallel/test-stream-writev.js
+++ b/test/parallel/test-stream-writev.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var stream = require('stream');
diff --git a/test/parallel/test-stream2-base64-single-char-read-end.js b/test/parallel/test-stream2-base64-single-char-read-end.js
index 2d60877de83662..900e090921b712 100644
--- a/test/parallel/test-stream2-base64-single-char-read-end.js
+++ b/test/parallel/test-stream2-base64-single-char-read-end.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var R = require('_stream_readable');
 var W = require('_stream_writable');
 var assert = require('assert');
diff --git a/test/parallel/test-stream2-compatibility.js b/test/parallel/test-stream2-compatibility.js
index cbb65facfa7073..76cb5942291a53 100644
--- a/test/parallel/test-stream2-compatibility.js
+++ b/test/parallel/test-stream2-compatibility.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var R = require('_stream_readable');
 var W = require('_stream_writable');
 var assert = require('assert');
diff --git a/test/parallel/test-stream2-finish-pipe.js b/test/parallel/test-stream2-finish-pipe.js
index 913bb7b0b4db09..63c78759cab60d 100644
--- a/test/parallel/test-stream2-finish-pipe.js
+++ b/test/parallel/test-stream2-finish-pipe.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var stream = require('stream');
 var Buffer = require('buffer').Buffer;
 
diff --git a/test/parallel/test-stream2-large-read-stall.js b/test/parallel/test-stream2-large-read-stall.js
index 4cd89599fee730..84457c7e3e9ff7 100644
--- a/test/parallel/test-stream2-large-read-stall.js
+++ b/test/parallel/test-stream2-large-read-stall.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // If everything aligns so that you do a read(n) of exactly the
diff --git a/test/parallel/test-stream2-objects.js b/test/parallel/test-stream2-objects.js
index a2f554a0b8a004..e79b8f9524c494 100644
--- a/test/parallel/test-stream2-objects.js
+++ b/test/parallel/test-stream2-objects.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var Readable = require('_stream_readable');
 var Writable = require('_stream_writable');
 var assert = require('assert');
diff --git a/test/parallel/test-stream2-pipe-error-handling.js b/test/parallel/test-stream2-pipe-error-handling.js
index 9eddbdd90d00c3..7d7cfb6b2b3307 100644
--- a/test/parallel/test-stream2-pipe-error-handling.js
+++ b/test/parallel/test-stream2-pipe-error-handling.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var stream = require('stream');
 
diff --git a/test/parallel/test-stream2-pipe-error-once-listener.js b/test/parallel/test-stream2-pipe-error-once-listener.js
index f2ecb87ce97a75..3ca0782ea069d4 100644
--- a/test/parallel/test-stream2-pipe-error-once-listener.js
+++ b/test/parallel/test-stream2-pipe-error-once-listener.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var util = require('util');
diff --git a/test/parallel/test-stream2-push.js b/test/parallel/test-stream2-push.js
index a225796d1e3120..99b73d7277aa52 100644
--- a/test/parallel/test-stream2-push.js
+++ b/test/parallel/test-stream2-push.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var stream = require('stream');
 var Readable = stream.Readable;
 var Writable = stream.Writable;
diff --git a/test/parallel/test-stream2-read-sync-stack.js b/test/parallel/test-stream2-read-sync-stack.js
index e912e1039ff558..4bce87ffb9dffd 100644
--- a/test/parallel/test-stream2-read-sync-stack.js
+++ b/test/parallel/test-stream2-read-sync-stack.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Readable = require('stream').Readable;
 var r = new Readable();
diff --git a/test/parallel/test-stream2-readable-empty-buffer-no-eof.js b/test/parallel/test-stream2-readable-empty-buffer-no-eof.js
index 8e4001f8022f1c..2ebb1a696f3348 100644
--- a/test/parallel/test-stream2-readable-empty-buffer-no-eof.js
+++ b/test/parallel/test-stream2-readable-empty-buffer-no-eof.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('stream').Readable;
diff --git a/test/parallel/test-stream2-readable-from-list.js b/test/parallel/test-stream2-readable-from-list.js
index a8d9fb38f25090..d4b42b60af65a4 100644
--- a/test/parallel/test-stream2-readable-from-list.js
+++ b/test/parallel/test-stream2-readable-from-list.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 var fromList = require('_stream_readable')._fromList;
 
 // tiny node-tap lookalike.
diff --git a/test/parallel/test-stream2-readable-legacy-drain.js b/test/parallel/test-stream2-readable-legacy-drain.js
index 4218bace2b878f..399771e46a11ed 100644
--- a/test/parallel/test-stream2-readable-legacy-drain.js
+++ b/test/parallel/test-stream2-readable-legacy-drain.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Stream = require('stream');
diff --git a/test/parallel/test-stream2-readable-non-empty-end.js b/test/parallel/test-stream2-readable-non-empty-end.js
index 46d6f92f2b9df2..1953503ef9be2e 100644
--- a/test/parallel/test-stream2-readable-non-empty-end.js
+++ b/test/parallel/test-stream2-readable-non-empty-end.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 var Readable = require('_stream_readable');
 
 var len = 0;
diff --git a/test/parallel/test-stream2-readable-wrap-empty.js b/test/parallel/test-stream2-readable-wrap-empty.js
index 60417ca893300d..d2bf8f3f306f6d 100644
--- a/test/parallel/test-stream2-readable-wrap-empty.js
+++ b/test/parallel/test-stream2-readable-wrap-empty.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('_stream_readable');
diff --git a/test/parallel/test-stream2-readable-wrap.js b/test/parallel/test-stream2-readable-wrap.js
index 8e3e04b966010f..acf1cfdb030439 100644
--- a/test/parallel/test-stream2-readable-wrap.js
+++ b/test/parallel/test-stream2-readable-wrap.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var Readable = require('_stream_readable');
diff --git a/test/parallel/test-stream2-set-encoding.js b/test/parallel/test-stream2-set-encoding.js
index ea9a315cb1a6e1..40e09035a98e90 100644
--- a/test/parallel/test-stream2-set-encoding.js
+++ b/test/parallel/test-stream2-set-encoding.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var R = require('_stream_readable');
 var util = require('util');
diff --git a/test/parallel/test-stream2-transform.js b/test/parallel/test-stream2-transform.js
index e45c913c94f559..7dad5734839791 100644
--- a/test/parallel/test-stream2-transform.js
+++ b/test/parallel/test-stream2-transform.js
@@ -1,6 +1,6 @@
 'use strict';
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 var PassThrough = require('_stream_passthrough');
 var Transform = require('_stream_transform');
 
diff --git a/test/parallel/test-stream2-unpipe-leak.js b/test/parallel/test-stream2-unpipe-leak.js
index 15b510e7f643cc..3b529bac1f2e9c 100644
--- a/test/parallel/test-stream2-unpipe-leak.js
+++ b/test/parallel/test-stream2-unpipe-leak.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var stream = require('stream');
 
diff --git a/test/parallel/test-stream2-writable.js b/test/parallel/test-stream2-writable.js
index 1d87d7f920c052..81e57d06eb3bec 100644
--- a/test/parallel/test-stream2-writable.js
+++ b/test/parallel/test-stream2-writable.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var W = require('_stream_writable');
 var D = require('_stream_duplex');
 var assert = require('assert');
diff --git a/test/parallel/test-stream3-pause-then-read.js b/test/parallel/test-stream3-pause-then-read.js
index 135629a243d66c..e4e33738b33206 100644
--- a/test/parallel/test-stream3-pause-then-read.js
+++ b/test/parallel/test-stream3-pause-then-read.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var stream = require('stream');
diff --git a/test/parallel/test-string-decoder.js b/test/parallel/test-string-decoder.js
index 0b22d3dd04efc9..9d0034e2fc9c7d 100644
--- a/test/parallel/test-string-decoder.js
+++ b/test/parallel/test-string-decoder.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var StringDecoder = require('string_decoder').StringDecoder;
 
diff --git a/test/parallel/test-stringbytes-external.js b/test/parallel/test-stringbytes-external.js
index ba3f0c5d1d9ade..1f03e2be42f577 100644
--- a/test/parallel/test-stringbytes-external.js
+++ b/test/parallel/test-stringbytes-external.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 // minimum string size to overflow into external string space
 var EXTERN_APEX = 0xFBEE9;
diff --git a/test/parallel/test-timers-active.js b/test/parallel/test-timers-active.js
index acddc2f41a45e8..d8faa1f5a33483 100644
--- a/test/parallel/test-timers-active.js
+++ b/test/parallel/test-timers-active.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const active = require('timers').active;
 
diff --git a/test/parallel/test-timers-args.js b/test/parallel/test-timers-args.js
index abb785ea0fc79c..ae11e35ba2784d 100644
--- a/test/parallel/test-timers-args.js
+++ b/test/parallel/test-timers-args.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 function range(n) {
diff --git a/test/parallel/test-timers-immediate-queue.js b/test/parallel/test-timers-immediate-queue.js
index a71472d46442ab..62482d510a6608 100644
--- a/test/parallel/test-timers-immediate-queue.js
+++ b/test/parallel/test-timers-immediate-queue.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // setImmediate should run clear its queued cbs once per event loop turn
diff --git a/test/parallel/test-timers-immediate.js b/test/parallel/test-timers-immediate.js
index bcfc4616ac6264..9486465602ce9b 100644
--- a/test/parallel/test-timers-immediate.js
+++ b/test/parallel/test-timers-immediate.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var immediateA = false,
diff --git a/test/parallel/test-timers-linked-list.js b/test/parallel/test-timers-linked-list.js
index 0c76af970a1fb7..c046a3024af317 100644
--- a/test/parallel/test-timers-linked-list.js
+++ b/test/parallel/test-timers-linked-list.js
@@ -2,7 +2,7 @@
 
 // Flags: --expose-internals
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const L = require('_linklist');
 const internalL = require('internal/linkedlist');
diff --git a/test/parallel/test-timers-now.js b/test/parallel/test-timers-now.js
index 466bd064b8decf..8a47e397ce97a8 100644
--- a/test/parallel/test-timers-now.js
+++ b/test/parallel/test-timers-now.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 // Return value of Timer.now() should easily fit in a SMI right after start-up.
diff --git a/test/parallel/test-timers-ordering.js b/test/parallel/test-timers-ordering.js
index 730a78a072c663..5da88967e37dda 100644
--- a/test/parallel/test-timers-ordering.js
+++ b/test/parallel/test-timers-ordering.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Timer = process.binding('timer_wrap').Timer;
 
diff --git a/test/parallel/test-timers-uncaught-exception.js b/test/parallel/test-timers-uncaught-exception.js
index 794b3b923be1df..6b6dc583715849 100644
--- a/test/parallel/test-timers-uncaught-exception.js
+++ b/test/parallel/test-timers-uncaught-exception.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var exceptions = 0;
diff --git a/test/parallel/test-timers-unref-active.js b/test/parallel/test-timers-unref-active.js
index 08f28b0153fecb..ad72ac4047747b 100644
--- a/test/parallel/test-timers-unref-active.js
+++ b/test/parallel/test-timers-unref-active.js
@@ -15,7 +15,7 @@
  * all 10 timeouts had the time to expire.
  */
 
-const common = require('../common');
+require('../common');
 const timers = require('timers');
 const assert = require('assert');
 
diff --git a/test/parallel/test-timers-unref-call.js b/test/parallel/test-timers-unref-call.js
index b348330d200d65..edd5865e8f610b 100644
--- a/test/parallel/test-timers-unref-call.js
+++ b/test/parallel/test-timers-unref-call.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 
 var Timer = process.binding('timer_wrap').Timer;
 Timer.now = function() { return ++Timer.now.ticks; };
diff --git a/test/parallel/test-timers-unref-remove-other-unref-timers-only-one-fires.js b/test/parallel/test-timers-unref-remove-other-unref-timers-only-one-fires.js
index aead4a4e7def64..971c485a4cf986 100644
--- a/test/parallel/test-timers-unref-remove-other-unref-timers-only-one-fires.js
+++ b/test/parallel/test-timers-unref-remove-other-unref-timers-only-one-fires.js
@@ -10,7 +10,7 @@
  * This behavior is a private implementation detail and should not be
  * considered public interface.
  */
-const common = require('../common');
+require('../common');
 const timers = require('timers');
 const assert = require('assert');
 
diff --git a/test/parallel/test-timers-unref.js b/test/parallel/test-timers-unref.js
index c0b24a4275be86..671c676e350e3a 100644
--- a/test/parallel/test-timers-unref.js
+++ b/test/parallel/test-timers-unref.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var interval_fired = false,
diff --git a/test/parallel/test-timers-zero-timeout.js b/test/parallel/test-timers-zero-timeout.js
index 1c84814363a641..78445ac6596db9 100644
--- a/test/parallel/test-timers-zero-timeout.js
+++ b/test/parallel/test-timers-zero-timeout.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // https://github.com/joyent/node/issues/2079 - zero timeout drops extra args
diff --git a/test/parallel/test-timers.js b/test/parallel/test-timers.js
index e784e262959d97..0b379e0eb45ad0 100644
--- a/test/parallel/test-timers.js
+++ b/test/parallel/test-timers.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var inputs = [
diff --git a/test/parallel/test-tls-parse-cert-string.js b/test/parallel/test-tls-parse-cert-string.js
index 57180c9ce9df56..11128783871fe4 100644
--- a/test/parallel/test-tls-parse-cert-string.js
+++ b/test/parallel/test-tls-parse-cert-string.js
@@ -1,6 +1,6 @@
 'use strict';
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const tls = require('tls');
 
diff --git a/test/parallel/test-tty-stdout-end.js b/test/parallel/test-tty-stdout-end.js
index 57f9c03ec449e9..a33a2e5ed27209 100644
--- a/test/parallel/test-tty-stdout-end.js
+++ b/test/parallel/test-tty-stdout-end.js
@@ -1,6 +1,6 @@
 'use strict';
 // Can't test this when 'make test' doesn't assign a tty to the stdout.
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 
 const shouldThrow = function() {
diff --git a/test/parallel/test-tty-wrap.js b/test/parallel/test-tty-wrap.js
index dbe7b6890fd218..5e124dc89f7b87 100644
--- a/test/parallel/test-tty-wrap.js
+++ b/test/parallel/test-tty-wrap.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var TTY = process.binding('tty_wrap').TTY;
diff --git a/test/parallel/test-url.js b/test/parallel/test-url.js
index 0905f4e900329a..a912b43d820e9f 100644
--- a/test/parallel/test-url.js
+++ b/test/parallel/test-url.js
@@ -1,6 +1,6 @@
 /* eslint-disable max-len */
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var url = require('url');
diff --git a/test/parallel/test-utf8-scripts.js b/test/parallel/test-utf8-scripts.js
index 3a891283509b9e..a9db5d10e4fde7 100644
--- a/test/parallel/test-utf8-scripts.js
+++ b/test/parallel/test-utf8-scripts.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // üäö
diff --git a/test/parallel/test-util-decorate-error-stack.js b/test/parallel/test-util-decorate-error-stack.js
index f289d52be404d3..100b04ebe084c0 100644
--- a/test/parallel/test-util-decorate-error-stack.js
+++ b/test/parallel/test-util-decorate-error-stack.js
@@ -1,6 +1,6 @@
 // Flags: --expose_internals
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const internalUtil = require('internal/util');
 const spawnSync = require('child_process').spawnSync;
diff --git a/test/parallel/test-util-format.js b/test/parallel/test-util-format.js
index 6761671e1997bd..00028ddbb74728 100644
--- a/test/parallel/test-util-format.js
+++ b/test/parallel/test-util-format.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 var symbol = Symbol('foo');
diff --git a/test/parallel/test-util-inspect.js b/test/parallel/test-util-inspect.js
index ca642868c9aae1..29ab8f7310e9cf 100644
--- a/test/parallel/test-util-inspect.js
+++ b/test/parallel/test-util-inspect.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 const vm = require('vm');
diff --git a/test/parallel/test-util-internal.js b/test/parallel/test-util-internal.js
index 06fddb7e942c85..f5ea0ec23d164f 100644
--- a/test/parallel/test-util-internal.js
+++ b/test/parallel/test-util-internal.js
@@ -1,7 +1,7 @@
 'use strict';
 // Flags: --expose_internals
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const internalUtil = require('internal/util');
 const spawnSync = require('child_process').spawnSync;
diff --git a/test/parallel/test-util.js b/test/parallel/test-util.js
index 700532bd5a397b..864361d80a6dfa 100644
--- a/test/parallel/test-util.js
+++ b/test/parallel/test-util.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 var context = require('vm').runInNewContext;
diff --git a/test/parallel/test-v8-flag-type-check.js b/test/parallel/test-v8-flag-type-check.js
index 68bf30dba3cdbc..3724944821343c 100644
--- a/test/parallel/test-v8-flag-type-check.js
+++ b/test/parallel/test-v8-flag-type-check.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var v8 = require('v8');
 
diff --git a/test/parallel/test-v8-flags.js b/test/parallel/test-v8-flags.js
index d21cbc6c2635a5..cee924d5b13068 100644
--- a/test/parallel/test-v8-flags.js
+++ b/test/parallel/test-v8-flags.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var v8 = require('v8');
 var vm = require('vm');
diff --git a/test/parallel/test-v8-stats.js b/test/parallel/test-v8-stats.js
index fc4a6df30f8ed8..eb5566fe2bc28f 100644
--- a/test/parallel/test-v8-stats.js
+++ b/test/parallel/test-v8-stats.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var v8 = require('v8');
 
diff --git a/test/parallel/test-vm-basic.js b/test/parallel/test-vm-basic.js
index 96c615c44af10c..8f9cab90eb5a1b 100644
--- a/test/parallel/test-vm-basic.js
+++ b/test/parallel/test-vm-basic.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-context-async-script.js b/test/parallel/test-vm-context-async-script.js
index e146d48343aa60..b09eda85209807 100644
--- a/test/parallel/test-vm-context-async-script.js
+++ b/test/parallel/test-vm-context-async-script.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-context-property-forwarding.js b/test/parallel/test-vm-context-property-forwarding.js
index 5fcd64b8ba9094..4034441615ca9e 100644
--- a/test/parallel/test-vm-context-property-forwarding.js
+++ b/test/parallel/test-vm-context-property-forwarding.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-context.js b/test/parallel/test-vm-context.js
index e1cd2ef01e5176..3fe3cf1b66a88e 100644
--- a/test/parallel/test-vm-context.js
+++ b/test/parallel/test-vm-context.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-create-and-run-in-context.js b/test/parallel/test-vm-create-and-run-in-context.js
index 01df6ad4531e4a..94527598ca27b1 100644
--- a/test/parallel/test-vm-create-and-run-in-context.js
+++ b/test/parallel/test-vm-create-and-run-in-context.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-create-context-accessors.js b/test/parallel/test-vm-create-context-accessors.js
index 678cf3fbd2128e..d2e7d7bd8eacc2 100644
--- a/test/parallel/test-vm-create-context-accessors.js
+++ b/test/parallel/test-vm-create-context-accessors.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-create-context-arg.js b/test/parallel/test-vm-create-context-arg.js
index d44eeec18decd5..d569ce1089c386 100644
--- a/test/parallel/test-vm-create-context-arg.js
+++ b/test/parallel/test-vm-create-context-arg.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-create-context-circular-reference.js b/test/parallel/test-vm-create-context-circular-reference.js
index cb6a90dcaef321..851bebdb088adf 100644
--- a/test/parallel/test-vm-create-context-circular-reference.js
+++ b/test/parallel/test-vm-create-context-circular-reference.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-cross-context.js b/test/parallel/test-vm-cross-context.js
index 20a3792b28578e..5674f582426f1f 100644
--- a/test/parallel/test-vm-cross-context.js
+++ b/test/parallel/test-vm-cross-context.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-function-declaration.js b/test/parallel/test-vm-function-declaration.js
index 5ff194e12dd8d8..fd41be7564aab0 100644
--- a/test/parallel/test-vm-function-declaration.js
+++ b/test/parallel/test-vm-function-declaration.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-global-define-property.js b/test/parallel/test-vm-global-define-property.js
index f7f3e4f3df7d76..71e6ae9eaa0b73 100644
--- a/test/parallel/test-vm-global-define-property.js
+++ b/test/parallel/test-vm-global-define-property.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-global-identity.js b/test/parallel/test-vm-global-identity.js
index 647edb22b44db0..7d90408b64c2c7 100644
--- a/test/parallel/test-vm-global-identity.js
+++ b/test/parallel/test-vm-global-identity.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-harmony-proxies.js b/test/parallel/test-vm-harmony-proxies.js
index 2f008615ebaf54..15a58b2a4dacd4 100644
--- a/test/parallel/test-vm-harmony-proxies.js
+++ b/test/parallel/test-vm-harmony-proxies.js
@@ -1,7 +1,7 @@
 'use strict';
 // Flags: --harmony_proxies
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-harmony-symbols.js b/test/parallel/test-vm-harmony-symbols.js
index 86fde1b978ffb2..efd15327c5fa07 100644
--- a/test/parallel/test-vm-harmony-symbols.js
+++ b/test/parallel/test-vm-harmony-symbols.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-is-context.js b/test/parallel/test-vm-is-context.js
index 5a46a452b91634..cc106a15fbfc61 100644
--- a/test/parallel/test-vm-is-context.js
+++ b/test/parallel/test-vm-is-context.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-vm-preserves-property.js b/test/parallel/test-vm-preserves-property.js
index 85ce2d6e8165c8..9786ee54a7cffd 100644
--- a/test/parallel/test-vm-preserves-property.js
+++ b/test/parallel/test-vm-preserves-property.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-symbols.js b/test/parallel/test-vm-symbols.js
index d7d0ffe3af6157..d3419af559a2f2 100644
--- a/test/parallel/test-vm-symbols.js
+++ b/test/parallel/test-vm-symbols.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var vm = require('vm');
diff --git a/test/parallel/test-vm-syntax-error-message.js b/test/parallel/test-vm-syntax-error-message.js
index 4b48b0d474a88d..75748b24e193ee 100644
--- a/test/parallel/test-vm-syntax-error-message.js
+++ b/test/parallel/test-vm-syntax-error-message.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var child_process = require('child_process');
 
diff --git a/test/parallel/test-vm-timeout.js b/test/parallel/test-vm-timeout.js
index e9511e59230a84..b4dd57bb54d234 100644
--- a/test/parallel/test-vm-timeout.js
+++ b/test/parallel/test-vm-timeout.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var vm = require('vm');
 
diff --git a/test/parallel/test-writedouble.js b/test/parallel/test-writedouble.js
index 2a9ab11107f147..4e86182137de29 100644
--- a/test/parallel/test-writedouble.js
+++ b/test/parallel/test-writedouble.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're writing doubles correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 function test(clazz) {
diff --git a/test/parallel/test-writefloat.js b/test/parallel/test-writefloat.js
index 948bf4910208a5..0cb748d603d0ff 100644
--- a/test/parallel/test-writefloat.js
+++ b/test/parallel/test-writefloat.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're writing floats correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 function test(clazz) {
diff --git a/test/parallel/test-writeint.js b/test/parallel/test-writeint.js
index ee981a157ad761..d05a90d48b5ac6 100644
--- a/test/parallel/test-writeint.js
+++ b/test/parallel/test-writeint.js
@@ -2,7 +2,7 @@
 /*
  * Tests to verify we're writing signed integers correctly
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 function test8(clazz) {
diff --git a/test/parallel/test-writeuint.js b/test/parallel/test-writeuint.js
index d9406fc930df0a..20d9d7dcefe063 100644
--- a/test/parallel/test-writeuint.js
+++ b/test/parallel/test-writeuint.js
@@ -2,7 +2,7 @@
 /*
  * A battery of tests to help us read a series of uints
  */
-var common = require('../common');
+require('../common');
 var ASSERT = require('assert');
 
 /*
diff --git a/test/parallel/test-zlib-close-after-write.js b/test/parallel/test-zlib-close-after-write.js
index c02ff33fb5eb63..b47deddd8889e9 100644
--- a/test/parallel/test-zlib-close-after-write.js
+++ b/test/parallel/test-zlib-close-after-write.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-const.js b/test/parallel/test-zlib-const.js
index 511eca613a5229..b7eb31d2c5f48c 100644
--- a/test/parallel/test-zlib-const.js
+++ b/test/parallel/test-zlib-const.js
@@ -1,5 +1,5 @@
 /* eslint-disable strict */
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var zlib = require('zlib');
diff --git a/test/parallel/test-zlib-convenience-methods.js b/test/parallel/test-zlib-convenience-methods.js
index 5808bdf04a8f14..70c102efd2862c 100644
--- a/test/parallel/test-zlib-convenience-methods.js
+++ b/test/parallel/test-zlib-convenience-methods.js
@@ -1,7 +1,7 @@
 'use strict';
 // test convenience methods with and without options supplied
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-dictionary.js b/test/parallel/test-zlib-dictionary.js
index 7e11b1966c69bf..8b465749ed02c7 100644
--- a/test/parallel/test-zlib-dictionary.js
+++ b/test/parallel/test-zlib-dictionary.js
@@ -1,7 +1,7 @@
 'use strict';
 // test compression/decompression with dictionary
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const zlib = require('zlib');
 const path = require('path');
diff --git a/test/parallel/test-zlib-flush-drain.js b/test/parallel/test-zlib-flush-drain.js
index 93966cd85d269a..26285c04739a25 100644
--- a/test/parallel/test-zlib-flush-drain.js
+++ b/test/parallel/test-zlib-flush-drain.js
@@ -1,5 +1,5 @@
 'use strict';
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const zlib = require('zlib');
 const path = require('path');
diff --git a/test/parallel/test-zlib-from-string.js b/test/parallel/test-zlib-from-string.js
index 49f4d139c148d9..14c747fc433692 100644
--- a/test/parallel/test-zlib-from-string.js
+++ b/test/parallel/test-zlib-from-string.js
@@ -1,7 +1,7 @@
 'use strict';
 // test compressing and uncompressing a string with zlib
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-invalid-input.js b/test/parallel/test-zlib-invalid-input.js
index e1e81bacc1a499..9850c6078c5320 100644
--- a/test/parallel/test-zlib-invalid-input.js
+++ b/test/parallel/test-zlib-invalid-input.js
@@ -1,8 +1,8 @@
 'use strict';
 // test uncompressing invalid input
 
-var common = require('../common'),
-    assert = require('assert'),
+require('../common');
+var assert = require('assert'),
     zlib = require('zlib');
 
 var nonStringInputs = [1, true, {a: 1}, ['a']];
diff --git a/test/parallel/test-zlib-truncated.js b/test/parallel/test-zlib-truncated.js
index 46bd83960bba36..38888b68be7084 100644
--- a/test/parallel/test-zlib-truncated.js
+++ b/test/parallel/test-zlib-truncated.js
@@ -1,7 +1,7 @@
 'use strict';
 // tests zlib streams with truncated compressed input
 
-const common = require('../common');
+require('../common');
 const assert = require('assert');
 const zlib = require ('zlib');
 
diff --git a/test/parallel/test-zlib-write-after-close.js b/test/parallel/test-zlib-write-after-close.js
index a1d9adb6d9b996..b1d35935e8ab19 100644
--- a/test/parallel/test-zlib-write-after-close.js
+++ b/test/parallel/test-zlib-write-after-close.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 
diff --git a/test/parallel/test-zlib-write-after-flush.js b/test/parallel/test-zlib-write-after-flush.js
index 4c53ca49ebf758..53fa715a673f7e 100644
--- a/test/parallel/test-zlib-write-after-flush.js
+++ b/test/parallel/test-zlib-write-after-flush.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var zlib = require('zlib');
 var fs = require('fs');
diff --git a/test/parallel/test-zlib-zero-byte.js b/test/parallel/test-zlib-zero-byte.js
index 9aa260a7f3149d..826a9c7c79793d 100644
--- a/test/parallel/test-zlib-zero-byte.js
+++ b/test/parallel/test-zlib-zero-byte.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var zlib = require('zlib');
diff --git a/test/pummel/test-dtrace-jsstack.js b/test/pummel/test-dtrace-jsstack.js
index 67194a3dd77f53..513cbeb0ee7f96 100644
--- a/test/pummel/test-dtrace-jsstack.js
+++ b/test/pummel/test-dtrace-jsstack.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var os = require('os');
 var util = require('util');
diff --git a/test/pummel/test-next-tick-infinite-calls.js b/test/pummel/test-next-tick-infinite-calls.js
index d4fdb3496423eb..7abdd38cf26e83 100644
--- a/test/pummel/test-next-tick-infinite-calls.js
+++ b/test/pummel/test-next-tick-infinite-calls.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var complete = 0;
diff --git a/test/pummel/test-process-hrtime.js b/test/pummel/test-process-hrtime.js
index 4fd66c03907aac..04225bae421b1a 100644
--- a/test/pummel/test-process-hrtime.js
+++ b/test/pummel/test-process-hrtime.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var start = process.hrtime();
diff --git a/test/pummel/test-process-uptime.js b/test/pummel/test-process-uptime.js
index a80806c2099cb1..8d2d88b74f736f 100644
--- a/test/pummel/test-process-uptime.js
+++ b/test/pummel/test-process-uptime.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 console.error(process.uptime());
diff --git a/test/pummel/test-stream-pipe-multi.js b/test/pummel/test-stream-pipe-multi.js
index 807e3c1415154e..44d6973938debe 100644
--- a/test/pummel/test-stream-pipe-multi.js
+++ b/test/pummel/test-stream-pipe-multi.js
@@ -2,7 +2,7 @@
 // Test that having a bunch of streams piping in parallel
 // doesn't break anything.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var Stream = require('stream').Stream;
 var rr = [];
diff --git a/test/pummel/test-stream2-basic.js b/test/pummel/test-stream2-basic.js
index fe921dc0058374..723e9a0308be00 100644
--- a/test/pummel/test-stream2-basic.js
+++ b/test/pummel/test-stream2-basic.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var R = require('_stream_readable');
 var assert = require('assert');
 
diff --git a/test/pummel/test-timer-wrap.js b/test/pummel/test-timer-wrap.js
index 62ba69d3fde033..d2e96e066d2fb1 100644
--- a/test/pummel/test-timer-wrap.js
+++ b/test/pummel/test-timer-wrap.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var timeouts = 0;
diff --git a/test/pummel/test-timer-wrap2.js b/test/pummel/test-timer-wrap2.js
index b289a85644a068..9f62bd95d01974 100644
--- a/test/pummel/test-timer-wrap2.js
+++ b/test/pummel/test-timer-wrap2.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // Test that allocating a timer does not increase the loop's reference
diff --git a/test/pummel/test-timers.js b/test/pummel/test-timers.js
index 2225da91edcf5f..c9ac9b8bf6d905 100644
--- a/test/pummel/test-timers.js
+++ b/test/pummel/test-timers.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var WINDOW = 200; // why is does this need to be so big?
diff --git a/test/pummel/test-vm-memleak.js b/test/pummel/test-vm-memleak.js
index f93f34127f9219..c6623991922da9 100644
--- a/test/pummel/test-vm-memleak.js
+++ b/test/pummel/test-vm-memleak.js
@@ -1,8 +1,8 @@
 'use strict';
 // Flags: --max_old_space_size=32
 
+require('../common');
 var assert = require('assert');
-var common = require('../common');
 
 var start = Date.now();
 var maxMem = 0;
diff --git a/test/sequential/test-debug-args.js b/test/sequential/test-debug-args.js
index 43853b3af34218..e5f9f3716119ed 100644
--- a/test/sequential/test-debug-args.js
+++ b/test/sequential/test-debug-args.js
@@ -1,7 +1,7 @@
 'use strict';
 // Flags: --debug-code
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 assert.notEqual(process.execArgv.indexOf('--debug-code'), -1);
diff --git a/test/sequential/test-deprecation-flags.js b/test/sequential/test-deprecation-flags.js
index 543e36846618fb..1b9521001e9eb0 100644
--- a/test/sequential/test-deprecation-flags.js
+++ b/test/sequential/test-deprecation-flags.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var execFile = require('child_process').execFile;
 var depmod = require.resolve('../fixtures/deprecated.js');
diff --git a/test/sequential/test-memory-usage-emfile.js b/test/sequential/test-memory-usage-emfile.js
index 6b439049805786..92c103669a9a85 100644
--- a/test/sequential/test-memory-usage-emfile.js
+++ b/test/sequential/test-memory-usage-emfile.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var fs = require('fs');
diff --git a/test/sequential/test-net-listen-exclusive-random-ports.js b/test/sequential/test-net-listen-exclusive-random-ports.js
index c32273a59b2a50..f46f9a01d773ce 100644
--- a/test/sequential/test-net-listen-exclusive-random-ports.js
+++ b/test/sequential/test-net-listen-exclusive-random-ports.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var cluster = require('cluster');
 var net = require('net');
diff --git a/test/sequential/test-regress-GH-1726.js b/test/sequential/test-regress-GH-1726.js
index 859ab6cc5e4253..c5f0bba1335264 100644
--- a/test/sequential/test-regress-GH-1726.js
+++ b/test/sequential/test-regress-GH-1726.js
@@ -4,7 +4,7 @@
 // exit when its child exits.
 // https://github.com/joyent/node/issues/1726
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var ch = require('child_process');
 
diff --git a/test/sequential/test-regress-GH-819.js b/test/sequential/test-regress-GH-819.js
index e459587d97cba9..a8a26b4e067f64 100644
--- a/test/sequential/test-regress-GH-819.js
+++ b/test/sequential/test-regress-GH-819.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var net = require('net');
 var assert = require('assert');
 
diff --git a/test/sequential/test-setproctitle.js b/test/sequential/test-setproctitle.js
index 11395f4fdbc52f..40107f5774962f 100644
--- a/test/sequential/test-setproctitle.js
+++ b/test/sequential/test-setproctitle.js
@@ -7,7 +7,7 @@ if ('linux freebsd darwin'.indexOf(process.platform) === -1) {
   return;
 }
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var exec = require('child_process').exec;
 var path = require('path');
diff --git a/test/sequential/test-sigint-infinite-loop.js b/test/sequential/test-sigint-infinite-loop.js
index 8211aeb69ec5db..1570f9c59dd5d3 100644
--- a/test/sequential/test-sigint-infinite-loop.js
+++ b/test/sequential/test-sigint-infinite-loop.js
@@ -2,7 +2,7 @@
 // This test is to assert that we can SIGINT a script which loops forever.
 // Ref(http):
 // groups.google.com/group/nodejs-dev/browse_thread/thread/e20f2f8df0296d3f
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var spawn = require('child_process').spawn;
 
diff --git a/test/sequential/test-stdin-child-proc.js b/test/sequential/test-stdin-child-proc.js
index 93bf265b8b0020..0189e94d5d4c8c 100644
--- a/test/sequential/test-stdin-child-proc.js
+++ b/test/sequential/test-stdin-child-proc.js
@@ -1,7 +1,7 @@
 'use strict';
 // This tests that pausing and resuming stdin does not hang and timeout
 // when done in a child process.  See test/simple/test-stdin-pause-resume.js
-var common = require('../common');
+require('../common');
 var child_process = require('child_process');
 var path = require('path');
 child_process.spawn(process.execPath,
diff --git a/test/sequential/test-stdin-pipe-resume.js b/test/sequential/test-stdin-pipe-resume.js
index dbac78d78c5e12..cd409a1d236f53 100644
--- a/test/sequential/test-stdin-pipe-resume.js
+++ b/test/sequential/test-stdin-pipe-resume.js
@@ -1,6 +1,6 @@
 'use strict';
 // This tests that piping stdin will cause it to resume() as well.
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 if (process.argv[2] === 'child') {
diff --git a/test/sequential/test-stdin-script-child.js b/test/sequential/test-stdin-script-child.js
index c5d5d6d44281e3..ad65734364e707 100644
--- a/test/sequential/test-stdin-script-child.js
+++ b/test/sequential/test-stdin-script-child.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
diff --git a/test/sequential/test-stdout-cannot-be-closed-child-process-pipe.js b/test/sequential/test-stdout-cannot-be-closed-child-process-pipe.js
index c6f5aecd40e262..a138108fae7e01 100644
--- a/test/sequential/test-stdout-cannot-be-closed-child-process-pipe.js
+++ b/test/sequential/test-stdout-cannot-be-closed-child-process-pipe.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 if (process.argv[2] === 'child')
diff --git a/test/sequential/test-stdout-stderr-reading.js b/test/sequential/test-stdout-stderr-reading.js
index 82fd51cedda1de..2cc029c501c162 100644
--- a/test/sequential/test-stdout-stderr-reading.js
+++ b/test/sequential/test-stdout-stderr-reading.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 // verify that stdout is never read from.
diff --git a/test/sequential/test-stream2-stderr-sync.js b/test/sequential/test-stream2-stderr-sync.js
index ccbdc55e4feaf9..0889a38ed398db 100644
--- a/test/sequential/test-stream2-stderr-sync.js
+++ b/test/sequential/test-stream2-stderr-sync.js
@@ -1,7 +1,7 @@
 'use strict';
 // Make sure that sync writes to stderr get processed before exiting.
 
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var util = require('util');
 
diff --git a/test/sequential/test-sync-fileread.js b/test/sequential/test-sync-fileread.js
index 24a80d96c2601b..6208e4c619efc7 100644
--- a/test/sequential/test-sync-fileread.js
+++ b/test/sequential/test-sync-fileread.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 var path = require('path');
 var fs = require('fs');
diff --git a/test/sequential/test-util-debug.js b/test/sequential/test-util-debug.js
index 02d30449a9944b..5f0306e5e01645 100644
--- a/test/sequential/test-util-debug.js
+++ b/test/sequential/test-util-debug.js
@@ -1,5 +1,5 @@
 'use strict';
-var common = require('../common');
+require('../common');
 var assert = require('assert');
 
 if (process.argv[2] === 'child')
diff --git a/test/timers/test-timers-reliability.js b/test/timers/test-timers-reliability.js
index b4332468bc2ec3..966b82fd6217c9 100644
--- a/test/timers/test-timers-reliability.js
+++ b/test/timers/test-timers-reliability.js
@@ -1,7 +1,7 @@
 'use strict';
 // FaketimeFlags: --exclude-monotonic -f '2014-07-21 09:00:00'
 
-var common = require('../common');
+require('../common');
 
 var Timer  = process.binding('timer_wrap').Timer;
 var assert = require('assert');