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Added Jest coverage configuration #179

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Added Jest coverage configuration #179

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11 changes: 8 additions & 3 deletions tutorial/02-babel-es6-eslint-flow-jest-husky.md
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Expand Up @@ -319,20 +319,25 @@ test('Dog.bark', () => {
})
```

- Add `jest` to your `test` script:
- Add `jest` to your `test` script and configure jest coverage to monitor any js file in the src directory/subdirectories:

```json
"scripts": {
"start": "babel-node src",
"test": "eslint src && flow && jest --coverage"
},
"jest":{
"testEnvironment": "node",
"collectCoverageFrom": [
"src/**/*js"
]
}
```

The `--coverage` flag makes Jest generate coverage data for your tests automatically. This is useful to see which parts of your codebase lack testing. It writes this data into a `coverage` folder.

- Add `/coverage/` to your `.gitignore`

🏁 Run `yarn test`. After linting and type checking, it should run Jest tests and show a coverage table. Everything should be green!
🏁 Run `yarn test`. After linting and type checking, it should run Jest tests and show a coverage table. Files that pass will be shown in green. Notice index.js is red, this is jest's coverage working for us as we have not created a test file for index.js.

## Git Hooks with Husky

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