add sourcemap to unit tests

Author: yyx990803

build/karma.config.js

@@ -5,9 +5,10 @@ module.exports = function (config) {
     frameworks: ['jasmine'],
     files: ['../test/unit/specs/index.js'],
     preprocessors: {
-      '../test/unit/specs/index.js': ['webpack']
+      '../test/unit/specs/index.js': ['webpack', 'sourcemap']
     },
     webpack: {
+      devtool: '#inline-source-map',
       module: {
         loaders: [
           {

package.json

@@ -54,6 +54,7 @@
     "karma-coverage": "^0.5.0",
     "karma-jasmine": "^0.3.5",
     "karma-phantomjs-launcher": "^0.2.1",
+    "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "0.0.23",
     "karma-webpack": "^1.7.0",
     "nightwatch": "^0.8.15",