fix(webpack): don't use html-plugin in test

fixes #2374

Author: Awk34

Diff for: templates/app/webpack.make.js

@@ -321,15 +321,17 @@ module.exports = function makeWebpackConfig(options) {
     // Skip rendering index.html in test mode
     // Reference: https://github.com/ampedandwired/html-webpack-plugin
     // Render index.html
-    let htmlConfig = {
-        template: 'client/_index.html',
-        filename: '../client/index.html',
-        alwaysWriteToDisk: true
+    if(!TEST) {
+        let htmlConfig = {
+            template: 'client/_index.html',
+            filename: '../client/index.html',
+            alwaysWriteToDisk: true
+        }
+        config.plugins.push(
+          new HtmlWebpackPlugin(htmlConfig),
+          new HtmlWebpackHarddiskPlugin()
+        );
     }
-    config.plugins.push(
-      new HtmlWebpackPlugin(htmlConfig),
-      new HtmlWebpackHarddiskPlugin()
-    );
 
     // Add build specific plugins
     if(BUILD) {