fix(karma): set defaults for karma.conf.js

The karma plugin is currently overwriting configuration set in karma.conf.js instead of merging existing values. This fix will set defaults but not overwrite existing configuration.

Author: JSMike

plugins/karma.js

@@ -9,19 +9,27 @@ const init = (config) => {
   const appConfig = angularCliConfig.apps[0];
 
   // add webpack config
-  config.webpack = getWebpackTestConfig(config.basePath, appConfig);
-  config.webpackMiddleware = {
-    noInfo: true, // Hide webpack output because its noisy.
-    stats: { // Also prevent chunk and module display output, cleaner look. Only emit errors.
-      assets: false,
-      colors: true,
-      version: false,
-      hash: false,
-      timings: false,
-      chunks: false,
-      chunkModules: false
-    }
-  };
+  config.webpack = Object.assign(
+    {}, 
+    getWebpackTestConfig(config.basePath, angularCliConfig.defaults.sourceDir), 
+    config.webpack
+  );
+  config.webpackMiddleware = Object.assign(
+    {}, 
+    {
+      noInfo: true, // Hide webpack output because its noisy.
+      stats: { // Also prevent chunk and module display output, cleaner look. Only emit errors.
+        assets: false,
+        colors: true,
+        version: false,
+        hash: false,
+        timings: false,
+        chunks: false,
+        chunkModules: false
+      }
+    }, 
+    config.webpackMiddleware
+  );
 
   // replace the angular-cli preprocessor with webpack+sourcemap
   Object.keys(config.preprocessors)
@@ -40,4 +48,4 @@ preprocessor.$inject = []
 module.exports = Object.assign({
   'framework:angular-cli': ['factory', init],
   'preprocessor:angular-cli': ['factory', preprocessor]
-}, require('karma-webpack'), require('karma-sourcemap-loader'));
+}, require('karma-webpack'), require('karma-sourcemap-loader'));