test: reduce string concatenations

PR-URL: #12735 Refs: #12455 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
nodejs · May 5, 2017 · 8b76c3e · 8b76c3e
1 parent 6bcf65d
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diff --git a/test/addons/repl-domain-abort/test.js b/test/addons/repl-domain-abort/test.js
@@ -39,7 +39,7 @@ process.on('exit', function() {
 
 const lines = [
   // This line shouldn't cause an assertion error.
-  'require(\'' + buildPath + '\')' +
+  `require('${buildPath}')` +
   // Log output to double check callback ran.
   '.method(function() { console.log(\'cb_ran\'); });',
 ];

diff --git a/test/common/index.js b/test/common/index.js
@@ -55,9 +55,8 @@ exports.isLinux = process.platform === 'linux';
 exports.isOSX = process.platform === 'darwin';
 
 exports.enoughTestMem = os.totalmem() > 0x40000000; /* 1 Gb */
-exports.bufferMaxSizeMsg = new RegExp('^RangeError: "size" argument' +
-                                      ' must not be larger than ' +
-                                      buffer.kMaxLength + '$');
+exports.bufferMaxSizeMsg = new RegExp(
+  `^RangeError: "size" argument must not be larger than ${buffer.kMaxLength}$`);
 const cpus = os.cpus();
 exports.enoughTestCpu = Array.isArray(cpus) &&
                         (cpus.length > 1 || cpus[0].speed > 999);
@@ -118,7 +117,7 @@ exports.refreshTmpDir = function() {
 
 if (process.env.TEST_THREAD_ID) {
   exports.PORT += process.env.TEST_THREAD_ID * 100;
-  exports.tmpDirName += '.' + process.env.TEST_THREAD_ID;
+  exports.tmpDirName += `.${process.env.TEST_THREAD_ID}`;
 }
 exports.tmpDir = path.join(testRoot, exports.tmpDirName);
 
@@ -217,10 +216,10 @@ Object.defineProperty(exports, 'hasFipsCrypto', {
 if (exports.isWindows) {
   exports.PIPE = '\\\\.\\pipe\\libuv-test';
   if (process.env.TEST_THREAD_ID) {
-    exports.PIPE += '.' + process.env.TEST_THREAD_ID;
+    exports.PIPE += `.${process.env.TEST_THREAD_ID}`;
   }
 } else {
-  exports.PIPE = exports.tmpDir + '/test.sock';
+  exports.PIPE = `${exports.tmpDir}/test.sock`;
 }
 
 const ifaces = os.networkInterfaces();
@@ -256,10 +255,9 @@ exports.childShouldThrowAndAbort = function() {
 exports.ddCommand = function(filename, kilobytes) {
   if (exports.isWindows) {
     const p = path.resolve(exports.fixturesDir, 'create-file.js');
-    return '"' + process.argv[0] + '" "' + p + '" "' +
-           filename + '" ' + (kilobytes * 1024);
+    return `"${process.argv[0]}" "${p}" "${filename}" ${kilobytes * 1024}`;
   } else {
-    return 'dd if=/dev/zero of="' + filename + '" bs=1024 count=' + kilobytes;
+    return `dd if=/dev/zero of="${filename}" bs=1024 count=${kilobytes}`;
   }
 };
 
@@ -495,7 +493,7 @@ exports.canCreateSymLink = function() {
     let output = '';
 
     try {
-      output = execSync(whoamiPath + ' /priv', { timout: 1000 });
+      output = execSync(`${whoamiPath} /priv`, { timout: 1000 });
     } catch (e) {
       err = true;
     } finally {
@@ -522,7 +520,7 @@ exports.skip = function(msg) {
 function ArrayStream() {
   this.run = function(data) {
     data.forEach((line) => {
-      this.emit('data', line + '\n');
+      this.emit('data', `${line}\n`);
     });
   };
 }

diff --git a/test/debugger/helper-debugger-repl.js b/test/debugger/helper-debugger-repl.js
@@ -34,11 +34,11 @@ let quit;
 
 function startDebugger(scriptToDebug) {
   scriptToDebug = process.env.NODE_DEBUGGER_TEST_SCRIPT ||
-                  common.fixturesDir + '/' + scriptToDebug;
+                  `${common.fixturesDir}/${scriptToDebug}`;
 
-  child = spawn(process.execPath, ['debug', '--port=' + port, scriptToDebug]);
+  child = spawn(process.execPath, ['debug', `--port=${port}`, scriptToDebug]);
 
-  console.error('./node', 'debug', '--port=' + port, scriptToDebug);
+  console.error('./node', 'debug', `--port=${port}`, scriptToDebug);
 
   child.stdout.setEncoding('utf-8');
   child.stdout.on('data', function(data) {
@@ -53,10 +53,10 @@ function startDebugger(scriptToDebug) {
   child.on('line', function(line) {
     line = line.replace(/^(debug> *)+/, '');
     console.log(line);
-    assert.ok(expected.length > 0, 'Got unexpected line: ' + line);
+    assert.ok(expected.length > 0, `Got unexpected line: ${line}`);
 
     const expectedLine = expected[0].lines.shift();
-    assert.ok(line.match(expectedLine) !== null, line + ' != ' + expectedLine);
+    assert.ok(line.match(expectedLine) !== null, `${line} != ${expectedLine}`);
 
     if (expected[0].lines.length === 0) {
       const callback = expected[0].callback;
@@ -83,7 +83,7 @@ function startDebugger(scriptToDebug) {
     console.error('dying badly buffer=%j', buffer);
     let err = 'Timeout';
     if (expected.length > 0 && expected[0].lines) {
-      err = err + '. Expected: ' + expected[0].lines.shift();
+      err = `${err}. Expected: ${expected[0].lines.shift()}`;
     }
 
     child.on('close', function() {
@@ -112,8 +112,8 @@ function startDebugger(scriptToDebug) {
 function addTest(input, output) {
   function next() {
     if (expected.length > 0) {
-      console.log('debug> ' + expected[0].input);
-      child.stdin.write(expected[0].input + '\n');
+      console.log(`debug> ${expected[0].input}`);
+      child.stdin.write(`${expected[0].input}\n`);
 
       if (!expected[0].lines) {
         const callback = expected[0].callback;

diff --git a/test/debugger/test-debugger-repl-utf8.js b/test/debugger/test-debugger-repl-utf8.js
@@ -21,7 +21,7 @@
 
 'use strict';
 const common = require('../common');
-const script = common.fixturesDir + '/breakpoints_utf8.js';
+const script = `${common.fixturesDir}/breakpoints_utf8.js`;
 process.env.NODE_DEBUGGER_TEST_SCRIPT = script;
 
 require('./test-debugger-repl.js');
diff --git a/test/gc/test-http-client-connaborted.js b/test/gc/test-http-client-connaborted.js
@@ -15,7 +15,7 @@ let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log('We should do ' + todo + ' requests');
+console.log(`We should do ${todo} requests`);
 
 const server = http.createServer(serverHandler);
 server.listen(0, getall);

diff --git a/test/gc/test-http-client-onerror.js b/test/gc/test-http-client-onerror.js
@@ -17,7 +17,7 @@ let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log('We should do ' + todo + ' requests');
+console.log(`We should do ${todo} requests`);
 
 const server = http.createServer(serverHandler);
 server.listen(0, runTest);

diff --git a/test/gc/test-http-client-timeout.js b/test/gc/test-http-client-timeout.js
@@ -19,7 +19,7 @@ let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log('We should do ' + todo + ' requests');
+console.log(`We should do ${todo} requests`);
 
 const server = http.createServer(serverHandler);
 server.listen(0, getall);

diff --git a/test/gc/test-http-client.js b/test/gc/test-http-client.js
@@ -15,7 +15,7 @@ let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log('We should do ' + todo + ' requests');
+console.log(`We should do ${todo} requests`);
 
 const server = http.createServer(serverHandler);
 server.listen(0, getall);

diff --git a/test/gc/test-net-timeout.js b/test/gc/test-net-timeout.js
@@ -26,7 +26,7 @@ let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log('We should do ' + todo + ' requests');
+console.log(`We should do ${todo} requests`);
 
 const server = net.createServer(serverHandler);
 server.listen(0, getall);

diff --git a/test/inspector/inspector-helper.js b/test/inspector/inspector-helper.js
@@ -169,13 +169,15 @@ TestSession.prototype.processMessage_ = function(message) {
     assert.strictEqual(id, this.expectedId_);
     this.expectedId_++;
     if (this.responseCheckers_[id]) {
-      assert(message['result'], JSON.stringify(message) + ' (response to ' +
-             JSON.stringify(this.messages_[id]) + ')');
+      const messageJSON = JSON.stringify(message);
+      const idJSON = JSON.stringify(this.messages_[id]);
+      assert(message['result'], `${messageJSON} (response to ${idJSON})`);
       this.responseCheckers_[id](message['result']);
       delete this.responseCheckers_[id];
     }
-    assert(!message['error'], JSON.stringify(message) + ' (replying to ' +
-           JSON.stringify(this.messages_[id]) + ')');
+    const messageJSON = JSON.stringify(message);
+    const idJSON = JSON.stringify(this.messages_[id]);
+    assert(!message['error'], `${messageJSON} (replying to ${idJSON})`);
     delete this.messages_[id];
     if (id === this.lastId_) {
       this.lastMessageResponseCallback_ && this.lastMessageResponseCallback_();
@@ -213,12 +215,8 @@ TestSession.prototype.sendInspectorCommands = function(commands) {
     };
     this.sendAll_(commands, () => {
       timeoutId = setTimeout(() => {
-        let s = '';
-        for (const id in this.messages_) {
-          s += id + ', ';
-        }
-        assert.fail('Messages without response: ' +
-                    s.substring(0, s.length - 2));
+        assert.fail(`Messages without response: ${
+                    Object.keys(this.messages_).join(', ')}`);
       }, TIMEOUT);
     });
   });
@@ -241,7 +239,7 @@ TestSession.prototype.expectMessages = function(expects) {
   if (!(expects instanceof Array)) expects = [ expects ];
 
   const callback = this.createCallbackWithTimeout_(
-      'Matching response was not received:\n' + expects[0]);
+      `Matching response was not received:\n${expects[0]}`);
   this.messagefilter_ = (message) => {
     if (expects[0](message))
       expects.shift();
@@ -256,7 +254,7 @@ TestSession.prototype.expectMessages = function(expects) {
 TestSession.prototype.expectStderrOutput = function(regexp) {
   this.harness_.addStderrFilter(
       regexp,
-      this.createCallbackWithTimeout_('Timed out waiting for ' + regexp));
+      this.createCallbackWithTimeout_(`Timed out waiting for ${regexp}`));
   return this;
 };
 

diff --git a/test/inspector/test-inspector.js b/test/inspector/test-inspector.js
@@ -19,7 +19,7 @@ function checkVersion(err, response) {
   assert.ifError(err);
   assert.ok(response);
   const expected = {
-    'Browser': 'node.js/' + process.version,
+    'Browser': `node.js/${process.version}`,
     'Protocol-Version': '1.1',
   };
   assert.strictEqual(JSON.stringify(response),
@@ -36,7 +36,7 @@ function expectMainScriptSource(result) {
   const expected = helper.mainScriptSource();
   const source = result['scriptSource'];
   assert(source && (source.includes(expected)),
-         'Script source is wrong: ' + source);
+         `Script source is wrong: ${source}`);
 }
 
 function setupExpectBreakOnLine(line, url, session, scopeIdCallback) {
@@ -187,7 +187,7 @@ function testI18NCharacters(session) {
     {
       'method': 'Debugger.evaluateOnCallFrame', 'params': {
         'callFrameId': '{"ordinal":0,"injectedScriptId":1}',
-        'expression': 'console.log("' + chars + '")',
+        'expression': `console.log("${chars}")`,
         'objectGroup': 'console',
         'includeCommandLineAPI': true,
         'silent': false,

diff --git a/test/internet/test-dns-cares-domains.js b/test/internet/test-dns-cares-domains.js
@@ -21,7 +21,7 @@ methods.forEach(function(method) {
   const d = domain.create();
   d.run(function() {
     dns[method]('google.com', function() {
-      assert.strictEqual(process.domain, d, method + ' retains domain');
+      assert.strictEqual(process.domain, d, `${method} retains domain`);
     });
   });
 });
diff --git a/test/internet/test-dns-ipv6.js b/test/internet/test-dns-ipv6.js
@@ -164,7 +164,7 @@ TEST(function test_lookup_all_ipv6(done) {
 
       ips.forEach((ip) => {
         assert.ok(isIPv6(ip.address),
-                  'Invalid IPv6: ' + ip.address.toString());
+                  `Invalid IPv6: ${ip.address.toString()}`);
         assert.strictEqual(ip.family, 6);
       });
 

diff --git a/test/internet/test-dns.js b/test/internet/test-dns.js
@@ -545,7 +545,7 @@ req.oncomplete = function(err, domains) {
 };
 
 process.on('exit', function() {
-  console.log(completed + ' tests completed');
+  console.log(`${completed} tests completed`);
   assert.strictEqual(running, false);
   assert.strictEqual(expected, completed);
   assert.ok(getaddrinfoCallbackCalled);

diff --git a/test/internet/test-tls-add-ca-cert.js b/test/internet/test-tls-add-ca-cert.js
@@ -13,7 +13,7 @@ const fs = require('fs');
 const tls = require('tls');
 
 function filenamePEM(n) {
-  return require('path').join(common.fixturesDir, 'keys', n + '.pem');
+  return require('path').join(common.fixturesDir, 'keys', `${n}.pem`);
 }
 
 function loadPEM(n) {

diff --git a/test/known_issues/test-cwd-enoent-file.js b/test/known_issues/test-cwd-enoent-file.js
@@ -19,7 +19,7 @@ if (process.argv[2] === 'child') {
   // Do nothing.
 } else {
   common.refreshTmpDir();
-  const dir = fs.mkdtempSync(common.tmpDir + '/');
+  const dir = fs.mkdtempSync(`${common.tmpDir}/`);
   process.chdir(dir);
   fs.rmdirSync(dir);
   assert.throws(process.cwd,

diff --git a/test/parallel/test-assert.js b/test/parallel/test-assert.js
@@ -177,7 +177,7 @@ assert.doesNotThrow(makeBlock(a.deepEqual, a1, a2));
 
 // having an identical prototype property
 const nbRoot = {
-  toString: function() { return this.first + ' ' + this.last; }
+  toString: function() { return `${this.first} ${this.last}`; }
 };
 
 function nameBuilder(first, last) {

diff --git a/test/parallel/test-async-wrap-check-providers.js b/test/parallel/test-async-wrap-check-providers.js
@@ -94,8 +94,8 @@ process.on('SIGINT', () => process.exit());
 // Run from closed net server above.
 function checkTLS() {
   const options = {
-    key: fs.readFileSync(common.fixturesDir + '/keys/ec-key.pem'),
-    cert: fs.readFileSync(common.fixturesDir + '/keys/ec-cert.pem')
+    key: fs.readFileSync(`${common.fixturesDir}/keys/ec-key.pem`),
+    cert: fs.readFileSync(`${common.fixturesDir}/keys/ec-cert.pem`)
   };
   const server = tls.createServer(options, common.noop)
     .listen(0, function() {

diff --git a/test/parallel/test-buffer-badhex.js b/test/parallel/test-buffer-badhex.js
@@ -44,6 +44,6 @@ const Buffer = require('buffer').Buffer;
   const hex = buf.toString('hex');
   assert.deepStrictEqual(Buffer.from(hex, 'hex'), buf);
 
-  const badHex = hex.slice(0, 256) + 'xx' + hex.slice(256, 510);
+  const badHex = `${hex.slice(0, 256)}xx${hex.slice(256, 510)}`;
   assert.deepStrictEqual(Buffer.from(badHex, 'hex'), buf.slice(0, 128));
 }
diff --git a/test/parallel/test-buffer-includes.js b/test/parallel/test-buffer-includes.js
@@ -199,7 +199,7 @@ const longBufferString = Buffer.from(longString);
 let pattern = 'ABACABADABACABA';
 for (let i = 0; i < longBufferString.length - pattern.length; i += 7) {
   const includes = longBufferString.includes(pattern, i);
-  assert(includes, 'Long ABACABA...-string at index ' + i);
+  assert(includes, `Long ABACABA...-string at index ${i}`);
 }
 assert(longBufferString.includes('AJABACA'), 'Long AJABACA, First J');
 assert(longBufferString.includes('AJABACA', 511), 'Long AJABACA, Second J');

diff --git a/test/parallel/test-buffer-indexof.js b/test/parallel/test-buffer-indexof.js
@@ -255,7 +255,7 @@ let pattern = 'ABACABADABACABA';
 for (let i = 0; i < longBufferString.length - pattern.length; i += 7) {
   const index = longBufferString.indexOf(pattern, i);
   assert.strictEqual((i + 15) & ~0xf, index,
-                     'Long ABACABA...-string at index ' + i);
+                     `Long ABACABA...-string at index ${i}`);
 }
 assert.strictEqual(510, longBufferString.indexOf('AJABACA'),
                    'Long AJABACA, First J');

diff --git a/test/parallel/test-child-process-buffering.js b/test/parallel/test-child-process-buffering.js
@@ -29,12 +29,12 @@ function pwd(callback) {
 
   child.stdout.setEncoding('utf8');
   child.stdout.on('data', function(s) {
-    console.log('stdout: ' + JSON.stringify(s));
+    console.log(`stdout: ${JSON.stringify(s)}`);
     output += s;
   });
 
   child.on('exit', common.mustCall(function(c) {
-    console.log('exit: ' + c);
+    console.log(`exit: ${c}`);
     assert.strictEqual(0, c);
   }));
 

diff --git a/test/parallel/test-child-process-default-options.js b/test/parallel/test-child-process-default-options.js
@@ -39,7 +39,7 @@ let response = '';
 child.stdout.setEncoding('utf8');
 
 child.stdout.on('data', function(chunk) {
-  console.log('stdout: ' + chunk);
+  console.log(`stdout: ${chunk}`);
   response += chunk;
 });
 

diff --git a/test/parallel/test-child-process-double-pipe.js b/test/parallel/test-child-process-double-pipe.js
@@ -56,7 +56,7 @@ if (common.isWindows) {
 
 // pipe echo | grep
 echo.stdout.on('data', function(data) {
-  console.error('grep stdin write ' + data.length);
+  console.error(`grep stdin write ${data.length}`);
   if (!grep.stdin.write(data)) {
     echo.stdout.pause();
   }
@@ -86,7 +86,7 @@ sed.on('exit', function() {
 
 // pipe grep | sed
 grep.stdout.on('data', function(data) {
-  console.error('grep stdout ' + data.length);
+  console.error(`grep stdout ${data.length}`);
   if (!sed.stdin.write(data)) {
     grep.stdout.pause();
   }

diff --git a/test/parallel/test-child-process-env.js b/test/parallel/test-child-process-env.js
@@ -45,7 +45,7 @@ let response = '';
 child.stdout.setEncoding('utf8');
 
 child.stdout.on('data', function(chunk) {
-  console.log('stdout: ' + chunk);
+  console.log(`stdout: ${chunk}`);
   response += chunk;
 });