Delphine Bugner
d53cc2b46d
Summary: ### Context - Since RN 0.73, in the jest.setup file, methods of the Image module (Image.getSize, Image.resolveAssetSource...) are mocked on the **JS side** (introduced in https://github.com/facebook/react-native/pull/36996) - It causes issues like https://github.com/facebook/react-native/issues/41907 : `Image.resolveAssetSource` returns nothing in test env with the new JS mock, when some test relies on it. - On my project, it broke the snapshots : the URL of images disappeared. I use `react-native-fast-image` which uses `Image.resolveAssetSource` to compute URLs. - I first opened a PR to fix exclusively Image.resolveAssetSource: https://github.com/facebook/react-native/pull/41957. I will close it to focus on this new one. - As suggested by ryancat and idrissakhi, it should be better to return to the previous mock, where no method is mocked on the JS side, and we can trust the actual JS to work in test. This is what this PR intends to do. ### Content Along fixing the Image module mock in jest.setup, this PR : - adds unit test on each one of the methods, ensuring they have a consistent behavior even when the module is mocked. - adds 3 missing native mocks for `NativeImageLoader`: `prefetchImageWithMetadata`, `getSizeWithHeaders` & `queryCache`. After this PR, no method from NativeImageLoader remains unmocked. ## Changelog: [GENERAL][FIXED] - fix jest setup for Image methods (resolveAssetSource, getSize, prefetch, queryCache) Pull Request resolved: https://github.com/facebook/react-native/pull/43497 Test Plan: See exhaustive unit tests in PR. You can re-use the mock with all the methods mocked and see how the new unit tests fail. I also patched those changes on my project: my snapshot did have their URL back (see demonstrative screenshots in my original PR: https://github.com/facebook/react-native/pull/41957 - NB; fixed mock was different but result was the same -> those screenshots cover only two cases, but anyway they illustrate well the case!) Reviewed By: ryancat Differential Revision: D54959063 Pulled By: tdn120 fbshipit-source-id: 837266bd6991eb8292d9f6af1774e897ac7a8890
React Native
Learn once, write anywhere:
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React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 13.4 and Android 6.0 (API 23) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
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Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
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