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Directory Structure

.
|-- dist/
|-- src/
|-- test/
|  `-- setup.jsx    # jsdom for renderIntoDocument()
|-- .babelrc
|-- .coveralls.yml
|-- .istanbul.yml
|-- package.json

Settings

.babelrc

{
  "presets": ["react", "es2015", "stage-0"],
  "env": {
    "test": {
      "plugins": [
        "babel-plugin-rewire"
      ]
    }
  }
}

.coveralls.yml

repo_token: [your-token]

.istanbul.yml

instrumentation:
  root: src
  extensions:
    - .jsx
    - .js

.travis.yml

sudo: false
language: node_js
node_js:
- "4"
before_install:
- "npm install -g npm@'>=3.5.1'"
after_script:
- "npm run test:cov"
- "npm install coveralls && cat ./coverage/lcov.info | coveralls"

Old version of npm can't handle caret for dependency versions, be sure to upgrade it so that it can work properly. Then run test with coverage calculation, send it to coveralls after all done.

Ref:

• Build#27
• NPM Update Issue of Travis-CI

package.json

{
  "scripts": {
    "test": "NODE_ENV=test NODE_PATH=./src mocha --compilers js:babel-core/register 'test/**/*.test.jsx' --recursive --require 'test/setup.jsx'",
    "test:cov": "NODE_ENV=test NODE_PATH=./src babel-node -- ./node_modules/.bin/isparta cover -x 'dist/*.js' --include '**/*.js' --include '**/*.jsx' _mocha -- 'test/**/*.test.jsx' --recursive --require 'test/setup.jsx'"
  }
}

Mocha Options

--compilers # compile with
--recursive # include sub directories
--require   # include libraries

Istanbul Options

--exclude   # coverage calculation exclude files
--include   # coverage calculation include files

Ref:

• 在Github上使用Coveralls顯示程式覆蓋率 - Node.js
• 實戰寫 redux code 測試
• How to cover JSX / React components?
• Node.js, Travis CI and Coveralls