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25639176ff
Summary:
This change only affects tests run with Jest. `require('/images/image1.png')` will be replaced with
```
Object {
"testUri": "relative/path/to/images/image1.png",
}
```
in the Jest snapshot instead of always being 1 returned by RelativeImageStub. This change makes it possible to test conditional asset loading in components.
The problem with this change is that it will probably break a lot of existing snapshots, but that should be easily fixed when a project updates to a new version of React Native by running `jest -u` to update all snapshots.
A component can have conditional asset loading based on its props, this logic would be nice to test with Jest snapshots. This problem has been discussed in https://github.com/facebook/jest/issues/2838.
* **Who does this affect**: Everyone using `Image` in Jest snapshots
* **How to migrate**: Running `jest -u` will update the snapshots, the snapshots should be reviewed that they are correct.
* **Why make this breaking change**: It enables testing of conditional asset loading.
* **Severity (number of people affected x effort)**: Low.
Closes https://github.com/facebook/react-native/pull/13319
Reviewed By: rafeca
Differential Revision: D5708180
Pulled By: mjesun
fbshipit-source-id: 16ac42004d597db08545a21d4fffe95c5ee7e21f
27 lines
908 B
JavaScript
27 lines
908 B
JavaScript
/**
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* Copyright (c) 2017-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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/* eslint-env node */
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const path = require('path');
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const createCacheKeyFunction = require('fbjs-scripts/jest/createCacheKeyFunction');
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module.exports = {
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// Mocks asset requires to return the filename. Makes it possible to test that
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// the correct images are loaded for components. Essentially
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// require('img1.png') becomes `Object { "testUri": 'path/to/img1.png' }` in
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// the Jest snapshot.
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process: (_, filename) =>
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`module.exports = {
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testUri: ${JSON.stringify(path.relative('.', filename))}
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};`,
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getCacheKey: createCacheKeyFunction([__filename]),
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};
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