Add test:cov to npm scripts

Author: acdlite

.gitignore

@@ -1,4 +1,5 @@
 node_modules
 npm-debug.log
 .DS_Store
-lib
+lib
+coverage

package.json

@@ -10,7 +10,8 @@
     "prepublish": "npm run clean && npm run build",
     "start": "cd examples && node server.js",
     "test": "NODE_ENV=test mocha --compilers js:babel/register --recursive",
-    "test:watch": "npm run test -- --watch"
+    "test:watch": "npm run test -- --watch",
+    "test:cov": "istanbul cover node_modules/.bin/_mocha -- --compilers js:babel/register --recursive"
   },
   "repository": {
     "type": "git",
@@ -41,6 +42,7 @@
     "eslint": "^0.22.1",
     "eslint-plugin-react": "^2.3.0",
     "expect": "^1.6.0",
+    "istanbul": "^0.3.15",
     "mocha": "^2.2.5",
     "react": "^0.13.0",
     "react-hot-loader": "^1.2.7",