test: Setting up test framework for JS unit tests

.eslintrc.yml

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+extends: google
+parser: babel-eslint
+rules: 
+  strict: 0
+  require-jsdoc: off
+  valid-jsdoc: off
+  switch-colon-spacing: 0

.gitignore

@@ -0,0 +1,3 @@
+coverage
+node_modules
+.DS_Store

karma.conf.js

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+// Karma configuration
+// Generated on Tue Mar 06 2018 14:20:28 GMT-0800 (PST)
+const path = require('path');
+
+module.exports = function(config) {
+  config.set({
+
+    // base path that will be used to resolve all patterns (eg. files, exclude)
+    basePath: '',
+
+
+    // frameworks to use
+    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
+    frameworks: ['mocha'],
+
+
+    // list of files / patterns to load in the browser
+    files: [
+      'test/unit/index.js'
+    ],
+
+
+    // list of files / patterns to exclude
+    exclude: [
+    ],
+
+
+    // preprocess matching files before serving them to the browser
+    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
+    preprocessors: {
+        'test/unit/index.js': ['webpack']
+    },
+
+    webpack: {
+      devtool: 'inline-source-map',
+      module: {
+        loaders: [
+          { test: /\.js?$/, loader: 'babel-loader' }
+        ],
+        rules: [
+            // instrument only testing sources with Istanbul
+            {
+              test: /\.js$/,
+              use: {
+                loader: 'istanbul-instrumenter-loader',
+                options: {esModules: true}
+              },
+              include: path.resolve('packages/'),
+              exclude: [
+                /node_modules/
+              ],
+              enforce: 'post'
+            }
+        ]
+      }
+    },
+
+    client: {
+      mocha: {
+        reporter: 'html',
+        ui: 'qunit',
+      },
+    },
+
+    // test results reporter to use
+    // possible values: 'dots', 'progress'
+    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
+    reporters: ['progress', 'coverage'],
+
+    coverageReporter: {
+      dir: 'coverage',
+      reporters: [
+        {type: 'lcovonly', subdir: '.'},
+        {type: 'json', subdir: '.', file: 'coverage.json'},
+        {type: 'html'},
+      ],
+    },
+
+
+    // web server port
+    port: 9876,
+
+
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
+
+
+    // level of logging
+    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+    logLevel: config.LOG_INFO,
+
+
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: false,
+
+
+    // start these browsers
+    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
+    browsers: ['Chrome'],
+
+
+    // Continuous Integration mode
+    // if true, Karma captures browsers, runs the tests and exits
+    singleRun: false,
+
+    // Concurrency level
+    // how many browser should be started simultaneous
+    concurrency: Infinity,
+  })
+}