Add build setup from vue-cli webpack template

build/webpack.test.conf.js

@@ -0,0 +1,24 @@
+// This is the webpack config used for unit tests.
+
+var utils = require('./utils')
+var webpack = require('webpack')
+var merge = require('webpack-merge')
+var baseConfig = require('./webpack.base.conf')
+
+var webpackConfig = merge(baseConfig, {
+  // use inline sourcemap for karma-sourcemap-loader
+  module: {
+    rules: utils.styleLoaders()
+  },
+  devtool: '#inline-source-map',
+  plugins: [
+    new webpack.DefinePlugin({
+      'process.env': require('../config/test.env')
+    })
+  ]
+})
+
+// no need for app entry during tests
+delete webpackConfig.entry
+
+module.exports = webpackConfig