remove the "test" bundle and apply it conditionally within main.js

app/assets/javascripts/main.js

@@ -36,8 +36,11 @@ import initBreadcrumbs from './breadcrumb';
 
 import initDispatcher from './dispatcher';
 
-// eslint-disable-next-line global-require, import/no-commonjs
-if (process.env.NODE_ENV !== 'production') require('./test_utils/');
+// inject test utilities if necessary
+if (process.env.NODE_ENV !== 'production' && gon && gon.test_env) {
+  $.fx.off = true;
+  import(/* webpackMode: "eager" */ './test_utils/');
+}
 
 svg4everybody();
 

app/assets/javascripts/test.js

-$.fx.off = true;

app/views/layouts/_head.html.haml

@@ -42,7 +42,6 @@
   = webpack_bundle_tag "common"
   = webpack_bundle_tag "main"
   = webpack_bundle_tag "raven" if Gitlab::CurrentSettings.clientside_sentry_enabled
-  = webpack_bundle_tag "test" if Rails.env.test?
 
   - if content_for?(:page_specific_javascripts)
     = yield :page_specific_javascripts

config/webpack.config.js

@@ -56,7 +56,6 @@ function generateEntries() {
     main:                 './main.js',
     ide:                  './ide/index.js',
     raven:                './raven/index.js',
-    test:                 './test.js',
     webpack_runtime:      './webpack.js',
   };