added test coverage

Author: Malte W

karma.conf.js

@@ -1,18 +1,32 @@
 /* eslint no-var: 0, no-unused-vars: 0 */
 var path = require('path');
 var webpack = require('webpack');
+var runCoverage = process.env.COVERAGE === 'true';
+
+var coverageLoaders = [];
+var coverageReporters = [];
+
+console.log('process.env.COVERAGE', process.env.COVERAGE);
+
+if (runCoverage) {
+    coverageLoaders.push({
+        test: /\.js$/,
+        include: path.resolve('src/'),
+        loader: 'isparta'
+    });
+    coverageReporters.push('coverage');
+}
 
 module.exports = function karmaConfig(config) {
     config.set({
-        browsers: [ 'Chrome' ],
+        browsers: ['Chrome'],
         singleRun: true,
-        // autoWatch: true,
-        frameworks: [ 'mocha' ],
-        files: [ './test.js' ],
+        frameworks: ['mocha'],
+        files: ['./test.js'],
         preprocessors: {
-            './test.js': [ 'webpack', 'sourcemap' ]
+            './test.js': ['webpack', 'sourcemap']
         },
-        reporters: [ 'mocha' ],
+        reporters: ['mocha'].concat(coverageReporters),
         webpack: {
             devtool: 'inline-source-map',
             resolve: {
@@ -25,8 +39,12 @@ module.exports = function karmaConfig(config) {
                     test: /\.js$/,
                     loader: 'babel',
                     exclude: /(node_modules)/
-                }]
+                }].concat(coverageLoaders)
             }
+        },
+        coverageReporter: {
+            type: 'html',
+            dir: 'coverage/'
         }
     });
 };

package.json

@@ -10,6 +10,7 @@
     "lint": "eslint src test examples",
     "test": "NODE_ENV=test karma start",
     "test:watch": "NODE_ENV=test karma start --auto-watch --no-single-run",
+    "test:cov": "NODE_ENV=test COVERAGE=true karma start --single-run",
     "prepublish": "npm run lint && npm run test && npm run clean && npm run build"
   },
   "repository": {
@@ -44,9 +45,11 @@
     "eslint-config-airbnb": "^5.0.0",
     "eslint-plugin-react": "^3.5.1",
     "expect": "^1.6.0",
+    "isparta-loader": "^2.0.0",
     "karma": "^0.13.10",
     "karma-chrome-launcher": "^0.2.1",
     "karma-cli": "^0.1.1",
+    "karma-coverage": "^0.5.3",
     "karma-mocha": "^0.2.0",
     "karma-mocha-reporter": "^1.0.3",
     "karma-sourcemap-loader": "^0.3.6",