Add coverage report

.gitignore

@@ -7,3 +7,4 @@ dist
 docs.json
 .idea
 .vscode
+coverage

.travis.yml

@@ -31,6 +31,8 @@ jobs:
     - stage: deploy
       if: tag IS present
       script: ./scripts/release/release.sh
+    - stage: Coverage report
+      script: ./scripts/test/coverageReport.sh
 
 cache: yarn
 

config/karma.js

@@ -131,11 +131,19 @@ function config(config) {
       public: 'public'
     },
 
+    coveageIstanbulReporter: {
+      reports: ['html', 'lcovonly'],
+      fixWebpackSourcePaths: true
+    },
+
     mochaReporter: {
       output: 'minimal'
     },
 
-    plugins: [
+    plugins: (process.env.COVERAGE_REPORT
+      ? ['karma-coverage', 'karma-coverage-istanbul-reporter']
+      : []
+    ).concat([
       'karma-mocha',
       'karma-mocha-reporter',
       'karma-phantomjs-launcher',
@@ -148,13 +156,13 @@ function config(config) {
       'karma-benchmark-reporter',
       { 'reporter:count': ['type', countReporter] },
       { 'reporter:benchmark-json': ['type', benchmarkJSONReporter] }
-    ],
+    ]),
 
     customLaunchers: process.env.TEST_CROSS_BROWSER
       ? sauceLabsLaunchers
       : process.env.TRAVIS
-        ? travisLaunchers
-        : localLaunchers,
+      ? travisLaunchers
+      : localLaunchers,
     browsers: getBrowsersConfig(),
     reporters: getReportersConfig()
   })
@@ -205,6 +213,8 @@ function getReportersConfig() {
     return ['dots', 'saucelabs', 'count']
   } else if (process.env.TEST_BENCHMARK) {
     return ['benchmark', 'benchmark-json']
+  } else if (process.env.COVERAGE_REPORT) {
+    return ['coverage-istanbul']
   } else {
     return ['mocha', 'count']
   }

config/webpack.js

@@ -8,7 +8,23 @@ const config = {
   entry: getEntryConfig(),
   output: getOutputConfig(),
   module: {
-    rules: [{ test: /\.js$/, exclude: /node_modules/, use: 'babel-loader' }]
+    rules: [
+      { test: /\.js$/, exclude: /node_modules/, use: 'babel-loader' }
+    ].concat(
+      process.env.COVERAGE_REPORT
+        ? [
+            {
+              test: /\.js$/,
+              use: {
+                loader: 'istanbul-instrumenter-loader',
+                options: { esModules: true }
+              },
+              enforce: 'post',
+              exclude: /node_modules|test.js$/
+            }
+          ]
+        : []
+    )
   }
 }
 

package.json

@@ -47,19 +47,23 @@
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-power-assert": "^1.0.0",
     "cloc": "^2.2.0",
+    "coveralls": "^3.0.2",
     "firebase": "^3.7.1",
     "flow-bin": "0.84.0",
     "fs-promise": "^1.0.0",
     "glob-promise": "^2.0.0",
     "gzip-size-cli": "^1.0.0",
     "husky": "^1.0.0-rc.7",
+    "istanbul-instrumenter-loader": "^3.0.1",
     "js-beautify": "^1.5.10",
     "jsdoc-to-markdown": "leshakoss/jsdoc-to-markdown",
     "karma": "^3.0.0",
     "karma-benchmark": "^1.0.0",
     "karma-benchmark-reporter": "^0.1.1",
     "karma-chrome-launcher": "2.2",
     "karma-cli": "^1.0.1",
+    "karma-coverage": "^1.1.2",
+    "karma-coverage-istanbul-reporter": "^2.0.4",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
     "karma-phantomjs-launcher": "^1.0.4",
@@ -84,5 +88,8 @@
     "webpack": "4",
     "webpack-cli": "^3.1.2",
     "world-countries": "^1.8.1"
+  },
+  "resolutions": {
+    "ajv": "6.8.1"
   }
 }

scripts/test/coverageReport.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# The script generates coverage report and uploads it to Coveralls.
+#
+# It's a part of the test process
+
+set -ex
+
+export PATH="$(yarn bin):$PATH"
+
+env COVERAGE_REPORT=true yarn test --single-run
+cat ./coverage/lcov.info | coveralls