add codecov reports

circle.yml

@@ -4,4 +4,4 @@ machine:
 
 test:
   override:
-    - npm run build
+    - npm run codecov

jest.config.js

@@ -7,5 +7,7 @@ module.exports = {
   ],
   "moduleNameMapper": {
     "^[./a-zA-Z0-9$_-]+\.css\!?$": "<rootDir>/dist/test/test-setup/cssStub.js",
-  }
+  },
+  "coverageDirectory": "<rootDir>/tmp/coverage/",
+  "collectCoverage": false
 };

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "test": "./node_modules/.bin/grunt buildTest && jest",
     "build": "./node_modules/.bin/grunt && jest",
-    "watch": "./node_modules/.bin/grunt watch"
+    "watch": "./node_modules/.bin/grunt watch",
+    "codecov": "jest --coverage && codecov"
   },
   "repository": {
     "type": "git",
@@ -23,6 +24,7 @@
     "babel-plugin-transform-es2015-modules-systemjs": "^6.5.0",
     "babel-preset-es2015": "^6.5.0",
     "benchmark": "^2.1.4",
+    "codecov": "^3.0.0",
     "grunt": "~0.4.5",
     "grunt-babel": "~6.0.0",
     "grunt-benchmark": "^1.0.0",