allow parallel envs with cucumber

lib/runner/cli/cli.js

@@ -450,6 +450,10 @@ class CliRunner {
   }
 
   isTestWorkersEnabled() {
+    if (this.testRunner.supportsTestWorkers === false) {
+      return false;
+    }
+
     const testWorkers =  this.test_settings.testWorkersEnabled && !singleSourceFile(this.argv);
     if (!testWorkers) {
 

lib/runner/test-runners/cucumber.js

@@ -246,6 +246,10 @@ class CucumberSuite extends TestSuite {
 
 class CucumberRunnner extends Runner {
   get supportsConcurrency() {
+    return true;
+  }
+
+  get supportsTestWorkers() {
     return false;
   }
 

test/cucumber-integration-tests/testCucumberTestsInParallel.js

@@ -41,7 +41,7 @@ describe('Cucumber integration - parallel running single formatter', function()
       });
   });
 
-  it('testCucumberSampleTests in parallel with multiple step definition files', function() {
+  it.only('testCucumberSampleTests in parallel with multiple step definition files', function() {
 
     commandMocks.elementText('5cc459b8-36a8-3042-8b4a-258883ea642b', 'xx');
 
@@ -56,6 +56,7 @@ describe('Cucumber integration - parallel running single formatter', function()
       parallel: true,
       verbose: true,
       timeout: 10,
+      env: 'chrome,firefox',
       silent: false,
       tags: ['not @fail'],
       format: 'progress',

test/extra/cucumber-config-parallel.js

@@ -26,6 +26,19 @@ module.exports = {
       feature_path: path.join(__dirname, '../cucumber-integration-tests/sample_cucumber_tests/parallel/sample.feature')
     }
   },
+
+  test_settings: {
+    chrome: {
+      desiredCapabilities: {
+        browserName: 'chrome'
+      }
+    },
+    firefox: {
+      desiredCapabilities: {
+        browserName: 'firefox'
+      }
+    }
+  },
   output: false,
   silent: false
-}
+};