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Note about setting up jest environment (io.js etc)

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Spencer Ahrens 2015-07-08 14:01:28 +02:00
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@ -19,6 +19,8 @@ We don't have perfect test coverage of course, especially for complex end-to-end
[Jest](http://facebook.github.io/jest/) tests are JS-only tests run on the command line with node. The tests themselves live in the `__tests__` directories of the files they test, and there is a large emphasis on aggressively mocking out functionality that is not under test for failure isolation and maximum speed. You can run the existing React Native jest tests with `npm test` from the react-native root, and we encourage you to add your own tests for any components you want to contribute to. See [`getImageSource-test.js`](https://github.com/facebook/react-native/blob/master/Examples/Movies/__tests__/getImageSource-test.js) for a basic example.
Note: you may have to install/upgrade/link io.js and other parts of your environment in order for the tests to run correctly. Check out the latest setup in [.travis.yml](https://github.com/facebook/react-native/blob/master/.travis.yml#L11-24)
## Integration Tests
React Native provides facilities to make it easier to test integrated components that require both native and JS components to communicate across the bridge. The two main components are `RCTTestRunner` and `RCTTestModule`. `RCTTestRunner` sets up the ReactNative environment and provides facilities to run the tests as `XCTestCase`s in Xcode (`runTest:module` is the simplest method). `RCTTestModule` is exported to JS as `NativeModules.TestModule`. The tests themselves are written in JS, and must call `TestModule.markTestCompleted()` when they are done, otherwise the test will timeout and fail. Test failures are primarily indicated by throwing a JS exception. It is also possible to test error conditions with `runTest:module:initialProps:expectErrorRegex:` or `runTest:module:initialProps:expectErrorBlock:` which will expect an error to be thrown and verify the error matches the provided criteria. See [`IntegrationTestHarnessTest.js`](https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/UIExplorerIntegrationTests/js/IntegrationTestHarnessTest.js), [`IntegrationTestsTests.m`](https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/UIExplorerIntegrationTests/IntegrationTestsTests.m), and [IntegrationTestsApp.js](https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/UIExplorerIntegrationTests/js/IntegrationTestsApp.js) for example usage and integration points.