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[react-native] Add unit test to ReactNativeAttributePayload #28955

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Apr 30, 2024
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[react-native] Add unit test to ReactNativeAttributePayload #28955

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13 changes: 13 additions & 0 deletions packages/react-native-renderer/src/__tests__/ReactNativeAttributePayload-test.internal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -204,6 +204,19 @@ describe('ReactNativeAttributePayload', () => {
).toEqual({foo: null}); // this should ideally be null. heuristic.
});

it('handles attributes defined multiple times', () => {
const validAttributes = {foo: true, style: {foo: true}};
expect(diff({}, {foo: 4, style: {foo: 2}}, validAttributes)).toEqual({
foo: 2,
});
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Wow really?

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Yuup.. which means code like https://github.com/facebook/react-native/blob/main/packages/react-native/Libraries/Components/View/View.js#L103 is unnecessary

For most native props on View etc, we allow them as valid attributes as a direct prop and as style..

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Oh wait is this only for style properties, I remember that now.

But what happens if you have custom native component that defines a backgroundColor prop?

expect(diff({foo: 4}, {style: {foo: 2}}, validAttributes)).toEqual({
foo: 2,
});
expect(diff({style: {foo: 2}}, {foo: 4}, validAttributes)).toEqual({
foo: 4,
});
});

// Function properties are just markers to native that events should be sent.
it('should convert functions to booleans', () => {
// Note that if the property changes from one function to another, we don't
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