Code coverage sample files

gulp-coverage.js

var config = require('config.json');
var fs = require('fs');
var gulp = require('gulp');
var mochaPhantomJS = require('gulp-mocha-phantomjs');
var webpack = require('webpack');
var remapIstanbul = require('remap-istanbul/lib/gulpRemapIstanbul');

var coverageFile = './results/coverage/coverage.json';

gulp.task('webpack-coverage', function (cb) {
  var webpackConfig = require('webpack-coverage.config');

  webpack(webpackConfig, function (err) {
    if (err) throw new Error('webpack', err);

    cb();
  });
});

gulp.task('coverage', ['webpack-coverage'], function () {
  return gulp
    .src(config.files.tests)
    .pipe(mochaPhantomJS({
      phantomjs: {
        hooks: 'mocha-phantomjs-istanbul',
        coverageFile,
        ignoreResourceErrors: true,
      },
      reporter: 'dot',
    }))
    .on('finish', function () {
      gulp.src(coverageFile)
          .pipe(remapIstanbul({
            reports: {
              html: './results/coverage',
            },
            warn: () => {},
          }));
    });
});

webpack-coverage.config.js

var config = require('./webpack.config')[0]; // regular config for production and development builds
var path = require('path');

config.devtool = '#inline-source-map';
config.entry = './specs/testRunner.js';
config.output.filename = 'coverage.bundle.js';
config.resolve.root.push(path.join(__dirname, 'specs'));
config.module.loaders[config.module.loaders.length - 1] = {
  exclude: /(node_modules)/,
  loader: 'babel-loader',
  test: /\.jsx?$/,
  query: {
    presets: ['es2015'],
    plugins: [
      ['istanbul', {
        exclude: [
          'specs/**/*.js',
          'dist/**/*.js',
          'node_modules/**/*.js',
        ],
      }],
    ],
  },
};

module.exports = config;