diff --git a/karma.conf.js b/karma.conf.js
index ad62cfc..fa182e3 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -16,7 +16,7 @@ module.exports = function(karma) {
     exclude: [],
 
     preprocessors: {
-      'tests.js': ['webpack']
+      'tests.js': ['webpack', 'sourcemap']
     },
 
     reporters: ['progress'],
@@ -32,13 +32,14 @@ module.exports = function(karma) {
 
     webpack: {
       resolve: {
-        root: __dirname
+        root: __dirname,
+        extensions: ['', '.ts', '.js']
       },
       module: {
         loaders: [
           {
-            test: /\.spec\.ts?$/,
-            exclude: /node_modules/,
+            test: /\.ts?$/,
+            exclude: /(node_modules)/,
             loader: 'ts-loader'
           }
         ]
diff --git a/package.json b/package.json
index aa82961..868cfad 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "karma": "^0.13.22",
     "karma-chrome-launcher": "^0.2.3",
     "karma-jasmine": "^0.3.8",
+    "karma-sourcemap-loader": "^0.3.7",
     "karma-typescript-preprocessor": "0.0.21",
     "karma-webpack": "^1.7.0",
     "merge2": "^1.0.0",
@@ -36,7 +37,8 @@
     "ts-loader": "^0.8.1",
     "typescript": "^1.8.9",
     "typings": "^0.7.9",
-    "webpack": "^1.12.14"
+    "webpack": "^1.12.14",
+    "zone.js": "^0.6.8"
   },
   "babel": {
     "presets": [