add code coverage

.babelrc.js

@@ -12,5 +12,10 @@ module.exports = {
   plugins: [
     process.env.PLUGINS && 'transform-es2015-modules-strip',
     '@babel/proposal-object-rest-spread'
-  ].filter(Boolean)
+  ].filter(Boolean),
+  env: {
+    test: {
+      plugins: [ 'istanbul' ]
+    }
+  }
 };

.gitignore

@@ -44,3 +44,4 @@ twbsconfig.yml
 
 # Folders to ignore
 node_modules
+js/coverage

js/tests/karma.conf.js

@@ -1,5 +1,7 @@
 /* eslint-env node */
 /* eslint no-process-env: 0 */
+const path = require('path')
+const jsCoveragePath = path.resolve(__dirname, '../coverage')
 
 module.exports = (config) => {
   const jqueryFile = process.env.USE_OLD_JQUERY ? 'js/tests/vendor/jquery-1.9.1.min.js' : 'assets/js/vendor/jquery-slim.min.js'
@@ -11,18 +13,19 @@ module.exports = (config) => {
       'karma-chrome-launcher',
       'karma-firefox-launcher',
       'karma-qunit',
-      'karma-detect-browsers'
+      'karma-detect-browsers',
+      'karma-coverage-istanbul-reporter'
     ],
     // list of files / patterns to load in the browser
     files: [
       jqueryFile,
       'assets/js/vendor/popper.min.js',
-      'js/dist/util.js',
-      'js/dist/tooltip.js',
-      'js/dist/!(util|index|tooltip).js', // include all of our js/dist files except util.js, index.js and tooltip.js
+      'js/coverage/dist/util.js',
+      'js/coverage/dist/tooltip.js',
+      'js/coverage/dist/!(util|index|tooltip).js', // include all of our js/dist files except util.js, index.js and tooltip.js
       'js/tests/unit/*.js'
     ],
-    reporters: ['dots'],
+    reporters: ['dots', 'coverage-istanbul'],
     port: 9876,
     colors: true,
     // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
@@ -49,6 +52,20 @@ module.exports = (config) => {
 
         throw new Error('Please install Firefox or Chrome')
       }
+    },
+    coverageIstanbulReporter: {
+      dir: jsCoveragePath,
+      reports: ['lcov', 'text-summary'],
+      fixWebpackSourcePaths: true,
+      thresholds: {
+        emitWarning: true,
+        global: {
+          statements: 80,
+          lines: 80,
+          branches: 80,
+          functions: 80
+        }
+      }
     }
   })
 }

package.json

@@ -33,12 +33,13 @@
     "js": "npm-run-all js-lint* js-compile js-minify",
     "js-main": "npm-run-all js-lint js-compile js-minify",
     "js-docs": "npm-run-all js-lint-docs js-minify-docs",
-    "js-lint": "eslint js/ build/",
+    "js-lint": "eslint js/src js/tests build/",
     "js-lint-docs": "eslint assets/js/ docs/ sw.js",
     "js-compile": "npm-run-all --parallel js-compile-*",
     "js-compile-standalone": "rollup --environment BUNDLE:false --config build/rollup.config.js --sourcemap",
     "js-compile-bundle": "rollup --environment BUNDLE:true --config build/rollup.config.js --sourcemap",
     "js-compile-plugins": "cross-env PLUGINS=true babel js/src/ --out-dir js/dist/ --source-maps",
+    "js-compile-plugins-coverage": "cross-env PLUGINS=true NODE_ENV=test babel js/src/ --out-dir js/coverage/dist/ --source-maps",
     "js-minify": "npm-run-all --parallel js-minify-*",
     "js-minify-standalone": "uglifyjs --compress typeofs=false --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.js.map,includeSources,url=bootstrap.min.js.map\" --output dist/js/bootstrap.min.js dist/js/bootstrap.js",
     "js-minify-bundle": "uglifyjs --compress typeofs=false --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.bundle.js.map,includeSources,url=bootstrap.bundle.min.js.map\" --output dist/js/bootstrap.bundle.min.js dist/js/bootstrap.bundle.js",
@@ -90,6 +91,7 @@
     "@babel/preset-env": "7.0.0-beta.40",
     "autoprefixer": "^8.1.0",
     "babel-eslint": "^8.2.2",
+    "babel-plugin-istanbul": "^4.1.5",
     "babel-plugin-transform-es2015-modules-strip": "^0.1.1",
     "bundlesize": "^0.16.0",
     "clean-css-cli": "^4.1.11",
@@ -101,6 +103,7 @@
     "jsunitsaucelabs": "^1.3.0",
     "karma": "^2.0.0",
     "karma-chrome-launcher": "^2.2.0",
+    "karma-coverage-istanbul-reporter": "^1.4.1",
     "karma-detect-browsers": "^2.2.6",
     "karma-firefox-launcher": "^1.1.0",
     "karma-qunit": "^1.2.1",