webpack.test.config.js

const webpack = require("webpack");
const nodeExternals = require("webpack-node-externals");

// Since webpack.test.config.js is used by command line, save it as a separate file.

module.exports = {
  target: "node", // in order to ignore built-in modules like path, fs, etc.
  externals: [nodeExternals()], // in order to ignore all modules in node_modules folder
  plugins: [
    new webpack.DefinePlugin({
      ENV: '"test"',
      "process.env": {
        NODE_ENV: JSON.stringify("test"),
      },
    }),
  ],
  module: {
    loaders: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: "babel-loader",
      },
      {
        test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: "file-loader",
      },
      {
        test: /\.less$/,
        loader: "style-loader!css-loader!less-loader",
      },
      {
        test: /\.css$/,
        loader: "style-loader!css-loader",
      },
      {
        test: /\.json$/,
        loader: "json-loader",
      },
      {
        test: /\.(png|jpg)$/,
        loader: "url-loader?limit=8192",
      },
    ],
  },
};