Set up Istanbul for JS Code Coverage

.istanbul.yml

+instrumentation:
+  root: "."
+  extensions: [".js", ".jsx"]
+  excludes: [
+    "node_modules/**",
+    "lib/**",
+    "public/**",
+    "test/**",
+    "coverage/**",
+  ]
+check:
+  global:
+    statements: 89
+    branches: 70
+    lines: 91
+    functions: 79

.travis.yml

@@ -13,6 +13,9 @@ script:
   - 'if [ -n "${LINT-}" ]; then npm run lint ; fi'
   - 'if [ -n "${TEST-}" ]; then npm run tests-only ; fi'
   - 'if [ -n "${KARMA-}" ]; then npm run tests-karma ; fi'
+  - 'if [ -n "${REACT-}" ]; then npm run cover; fi'
+after_success:
+  - 'if [ "${TRAVIS_NODE_VERSION}" = "4.2" ]; then cat ./coverage/lcov.info | ./node_modules/.bin/coveralls ; fi'
 env:
   global:
     - REACT=0.14

package.json

@@ -9,12 +9,17 @@
     "build:css": "node-sass css/styles.scss lib/css/_datepicker.css",
     "build:svg": "webpack",
     "clean": "rimraf lib",
+    "cover": "npm run cover:clean && npm run cover:mocha && npm run cover:check",
+    "cover:clean": "rimraf coverage",
+    "cover:check": "babel-node ./node_modules/istanbul/lib/cli check-coverage",
+    "cover:mocha": "babel-node ./node_modules/istanbul/lib/cli cover node_modules/mocha/bin/_mocha -- --compilers js:babel-register,jsx:babel-register --require airbnb-js-shims --recursive ./test/_helpers test/**/*",
     "lint": "eslint --ext .js,.jsx src test",
     "mocha": "mocha --compilers js:babel-register,jsx:babel-register --require airbnb-js-shims --recursive ./test/_helpers",
     "pretest": "npm run --silent lint",
     "tests-only": "npm run mocha --silent test",
     "tests-karma": "karma start",
     "test": "npm run tests-only && npm run tests-karma",
+    "posttest": "npm run --silent cover",
     "storybook": "start-storybook -p 9001 -s ./public",
     "tag": "git tag v$npm_package_version",
     "gh-pages:clean": "rimraf _gh-pages",
@@ -52,6 +57,7 @@
     "babel-preset-airbnb": "^2.0.0",
     "babel-register": "^6.11.6",
     "chai": "^3.5.0",
+    "coveralls": "^2.11.14",
     "enzyme": "^2.4.1",
     "eslint": "^3.3.1",
     "eslint-config-airbnb": "^10.0.1",
@@ -61,6 +67,7 @@
     "git-directory-deploy": "^1.5.1",
     "imports-loader": "^0.6.5",
     "in-publish": "^2.0.0",
+    "istanbul": "^1.1.0-alpha.1",
     "json-loader": "^0.5.4",
     "karma": "^1.2.0",
     "karma-chai": "^0.1.0",