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Add jest coverage configuration docs #3279

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Oct 21, 2017
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Add jest coverage configuration docs #3279

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35 changes: 35 additions & 0 deletions packages/react-scripts/template/README.md
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Expand Up @@ -1374,6 +1374,41 @@ Run `npm test -- --coverage` (note extra `--` in the middle) to include a covera

Note that tests run much slower with coverage so it is recommended to run it separately from your normal workflow.

#### Configuration

The default Jest coverage configuration can be overriden by adding any of the following supported keys to a Jest config in your package.json.

Supported overrides:
- [`collectCoverageFrom`](https://facebook.github.io/jest/docs/en/configuration.html#collectcoveragefrom-array)
- [`coverageReporters`](https://facebook.github.io/jest/docs/en/configuration.html#coveragereporters-array-string)
- [`coverageThreshold`](https://facebook.github.io/jest/docs/en/configuration.html#coveragethreshold-object)
- [`snapshotSerializers`](https://facebook.github.io/jest/docs/en/configuration.html#snapshotserializers-array-string)

Example package.json:

```json
{
"name": "your-package",
"jest": {
"collectCoverageFrom" : [
"src/**/*.{js,jsx}",
"!<rootDir>/node_modules/",
"!<rootDir>/path/to/dir/"
],
"coverageThreshold": {
"global": {
"branches": 90,
"functions": 90,
"lines": 90,
"statements": 90
}
},
"coverageReporters": ["text"],
"snapshotSerializers": ["my-serializer-module"]
}
}
```

### Continuous Integration

By default `npm test` runs the watcher with interactive CLI. However, you can force it to run tests once and finish the process by setting an environment variable called `CI`.
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