Build system: increase heap size for test-coverage (#11792)

* Build system: increase heap size for test-coverage

* fix duplication

* check out PR for duplicate checker

* undo jscpd changes

gulpfile.js

@@ -147,6 +147,17 @@ function makeVerbose(config = webpackConfig) {
   });
 }
 
+function prebidSource(webpackCfg) {
+  var externalModules = helpers.getArgModules();
+
+  const analyticsSources = helpers.getAnalyticsSources();
+  const moduleSources = helpers.getModulePaths(externalModules);
+
+  return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
+    .pipe(helpers.nameModules(externalModules))
+    .pipe(webpackStream(webpackCfg, webpack));
+}
+
 function makeDevpackPkg(config = webpackConfig) {
   return function() {
     var cloned = _.cloneDeep(config);
@@ -163,14 +174,7 @@ function makeDevpackPkg(config = webpackConfig) {
       .filter((use) => use.loader === 'babel-loader')
       .forEach((use) => use.options = Object.assign({}, use.options, babelConfig));
 
-    var externalModules = helpers.getArgModules();
-
-    const analyticsSources = helpers.getAnalyticsSources();
-    const moduleSources = helpers.getModulePaths(externalModules);
-
-    return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
-      .pipe(helpers.nameModules(externalModules))
-      .pipe(webpackStream(cloned, webpack))
+    return prebidSource(cloned)
       .pipe(gulp.dest('build/dev'))
       .pipe(connect.reload());
   }
@@ -183,14 +187,7 @@ function makeWebpackPkg(config = webpackConfig) {
   }
 
   return function buildBundle() {
-    var externalModules = helpers.getArgModules();
-
-    const analyticsSources = helpers.getAnalyticsSources();
-    const moduleSources = helpers.getModulePaths(externalModules);
-
-    return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
-      .pipe(helpers.nameModules(externalModules))
-      .pipe(webpackStream(cloned, webpack))
+    return prebidSource(cloned)
       .pipe(gulp.dest('build/dist'));
   }
 }
@@ -413,7 +410,9 @@ function runKarma(options, done) {
   // the karma server appears to leak memory; starting it multiple times in a row will run out of heap
   // here we run it in a separate process to bypass the problem
   options = Object.assign({browsers: helpers.parseBrowserArgs(argv)}, options)
-  const child = fork('./karmaRunner.js');
+  const child = fork('./karmaRunner.js', null, {
+    env: Object.assign({}, options.env, process.env)
+  });
   child.on('exit', (exitCode) => {
     if (exitCode) {
       done(new Error('Karma tests failed with exit code ' + exitCode));
@@ -426,7 +425,15 @@ function runKarma(options, done) {
 
 // If --file "<path-to-test-file>" is given, the task will only run tests in the specified file.
 function testCoverage(done) {
-  runKarma({coverage: true, browserstack: false, watch: false, file: argv.file}, done);
+  runKarma({
+    coverage: true,
+    browserstack: false,
+    watch: false,
+    file: argv.file,
+    env: {
+      NODE_OPTIONS: '--max-old-space-size=8096'
+    }
+  }, done);
 }
 
 function coveralls() { // 2nd arg is a dependency: 'test' must be finished