add test and update webpack config

[new] add test config
[new] add breadcrumb test
[change] update package.json
[new] util.js copied from  element
[unresolved] see test/unit/index.js @todo

build/webpack.base.config.js

@@ -2,6 +2,10 @@
  * 公共配置
  */
 var webpack = require('webpack');
+var path = require('path');
+function resolve (dir) {
+  return path.join(__dirname, '..', dir)
+}
 
 module.exports = {
     // 加载器
@@ -55,6 +59,10 @@ module.exports = {
         ]
     },
     resolve: {
-        extensions: ['.js', '.vue']
+        extensions: ['.js', '.vue'],
+        alias: {
+          'vue': 'vue/dist/vue.esm.js',
+          '@': resolve('src'),
+        }
     }
 };

build/webpack.dev.config.js

@@ -8,6 +8,7 @@ var webpack = require('webpack');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
 var merge = require('webpack-merge')
 var webpackBaseConfig = require('./webpack.base.config.js');
+var FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
 
 
 module.exports = merge(webpackBaseConfig, {
@@ -35,6 +36,7 @@ module.exports = merge(webpackBaseConfig, {
             inject: true,
             filename: path.join(__dirname, '../examples/dist/index.html'),
             template: path.join(__dirname, '../examples/index.html')
-        })
+        }),
+        new FriendlyErrorsPlugin()
     ]
 });

build/webpack.test.config.js

@@ -0,0 +1,25 @@
+/**
+ * 用于单元测试
+ */
+
+var webpack = require('webpack')
+var merge = require('webpack-merge')
+var webpackBaseConfig = require('./webpack.base.config.js');
+
+
+var webpackConfig = merge(webpackBaseConfig, {
+  // use inline sourcemap for karma-sourcemap-loader
+  devtool: '#inline-source-map',
+  plugins: [
+    new webpack.DefinePlugin({
+      'process.env': {
+        NODE_ENV: '"testing"'
+      }
+    })
+  ]
+})
+
+// no need for app entry during tests
+delete webpackConfig.entry
+
+module.exports = webpackConfig