Generate code coverage reports using nyc (#1170)

Change-type: patch
Signed-off-by: Lucian <lucian.buzzo@gmail.com>

Author: LucianBuzzo

.gitignore

@@ -121,3 +121,7 @@ site
 dist
 lib
 yarn.lock
+
+# Code coverage
+coverage
+.nyc_output

docs/index.md

@@ -258,6 +258,11 @@ $ npm test
 $ npm run tdd
 ```
 
+#### Code coverage
+
+Code coverage reports are generated using [nyc](https://github.com/istanbuljs/nyc) each time the `npm test-coverage` script is run. 
+The full report can be seen by opening `./coverage/lcov-report/index.html`.
+
 ### Releasing
 
 ```

package-lock.json

@@ -19,6 +19,7 @@
     "start": "node devServer.js",
     "tdd": "cross-env NODE_ENV=test mocha --require babel-register --watch --require ./test/setup-jsdom.js test/**/*_test.js",
     "test": "cross-env NODE_ENV=test mocha --require babel-register --require ./test/setup-jsdom.js test/**/*_test.js",
+    "test-coverage": "cross-env NODE_ENV=test nyc --reporter=lcov mocha --require babel-register --require ./test/setup-jsdom.js test/**/*_test.js",
     "test-debug": "cross-env NODE_ENV=test mocha --require babel-register --require ./test/setup-jsdom.js --debug-brk --inspect test/Form_test.js"
   },
   "prettierOptions": "--jsx-bracket-same-line --trailing-comma es5 --semi --tab-width 2",
@@ -83,6 +84,7 @@
     "lint-staged": "^3.3.1",
     "mini-css-extract-plugin": "^0.4.3",
     "mocha": "^5.2.0",
+    "nyc": "^13.2.0",
     "prettier": "^1.15.1",
     "react": "^15.5.0",
     "react-addons-test-utils": "^15.3.2",