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SchedulerMock.unstable_yieldValue -> SchedulerMock.log (#26312)
(This only affects our own internal repo; it's not a public API.) I think most of us agree this is a less confusing name. It's possible someone will confuse it with `console.log`. If that becomes a problem we can warn in dev or something.
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packages/internal-test-utils/__tests__/ReactInternalTestUtils-test.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @emails react-core | ||
| * @jest-environment node | ||
| */ | ||
|
|
||
| 'use strict'; | ||
|
|
||
| const React = require('react'); | ||
| const {startTransition, useDeferredValue} = React; | ||
| const ReactNoop = require('react-noop-renderer'); | ||
| const { | ||
| waitFor, | ||
| waitForAll, | ||
| waitForPaint, | ||
| waitForThrow, | ||
| assertLog, | ||
| } = require('internal-test-utils'); | ||
| const act = require('jest-react').act; | ||
| const Scheduler = require('scheduler/unstable_mock'); | ||
|
|
||
| describe('ReactInternalTestUtils', () => { | ||
| test('waitFor', async () => { | ||
| const Yield = ({id}) => { | ||
| Scheduler.log(id); | ||
| return id; | ||
| }; | ||
|
|
||
| const root = ReactNoop.createRoot(); | ||
| startTransition(() => { | ||
| root.render( | ||
| <div> | ||
| <Yield id="foo" /> | ||
| <Yield id="bar" /> | ||
| <Yield id="baz" /> | ||
| </div> | ||
| ); | ||
| }); | ||
|
|
||
| await waitFor(['foo', 'bar']); | ||
| expect(root).toMatchRenderedOutput(null); | ||
| await waitFor(['baz']); | ||
| expect(root).toMatchRenderedOutput(null); | ||
| await waitForAll([]); | ||
| expect(root).toMatchRenderedOutput(<div>foobarbaz</div>); | ||
| }); | ||
|
|
||
| test('waitForAll', async () => { | ||
| const Yield = ({id}) => { | ||
| Scheduler.log(id); | ||
| return id; | ||
| }; | ||
|
|
||
| const root = ReactNoop.createRoot(); | ||
| startTransition(() => { | ||
| root.render( | ||
| <div> | ||
| <Yield id="foo" /> | ||
| <Yield id="bar" /> | ||
| <Yield id="baz" /> | ||
| </div> | ||
| ); | ||
| }); | ||
|
|
||
| await waitForAll(['foo', 'bar', 'baz']); | ||
| expect(root).toMatchRenderedOutput(<div>foobarbaz</div>); | ||
| }); | ||
|
|
||
| test('waitForThrow', async () => { | ||
| const Yield = ({id}) => { | ||
| Scheduler.log(id); | ||
| return id; | ||
| }; | ||
|
|
||
| function BadRender() { | ||
| throw new Error('Oh no!'); | ||
| } | ||
|
|
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| function App() { | ||
| return ( | ||
| <div> | ||
| <Yield id="A" /> | ||
| <Yield id="B" /> | ||
| <BadRender /> | ||
| <Yield id="C" /> | ||
| <Yield id="D" /> | ||
| </div> | ||
| ); | ||
| } | ||
|
|
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| const root = ReactNoop.createRoot(); | ||
| root.render(<App />); | ||
|
|
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| await waitForThrow('Oh no!'); | ||
| assertLog([ | ||
| 'A', | ||
| 'B', | ||
| 'C', | ||
| 'D', | ||
| // React will try one more time before giving up. | ||
| 'A', | ||
| 'B', | ||
| 'C', | ||
| 'D', | ||
| ]); | ||
| }); | ||
|
|
||
| test('waitForPaint', async () => { | ||
| function App({prop}) { | ||
| const deferred = useDeferredValue(prop); | ||
| const text = `Urgent: ${prop}, Deferred: ${deferred}`; | ||
| Scheduler.log(text); | ||
| return text; | ||
| } | ||
|
|
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| const root = ReactNoop.createRoot(); | ||
| root.render(<App prop="A" />); | ||
|
|
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| await waitForAll(['Urgent: A, Deferred: A']); | ||
| expect(root).toMatchRenderedOutput('Urgent: A, Deferred: A'); | ||
|
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| // This update will result in two separate paints: an urgent one, and a | ||
| // deferred one. | ||
| root.render(<App prop="B" />); | ||
| // Urgent paint | ||
| await waitForPaint(['Urgent: B, Deferred: A']); | ||
| expect(root).toMatchRenderedOutput('Urgent: B, Deferred: A'); | ||
|
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| // Deferred paint | ||
| await waitForPaint(['Urgent: B, Deferred: B']); | ||
| expect(root).toMatchRenderedOutput('Urgent: B, Deferred: B'); | ||
| }); | ||
|
|
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| test('assertLog', async () => { | ||
| const Yield = ({id}) => { | ||
| Scheduler.log(id); | ||
| return id; | ||
| }; | ||
|
|
||
| function App() { | ||
| return ( | ||
| <div> | ||
| <Yield id="A" /> | ||
| <Yield id="B" /> | ||
| <Yield id="C" /> | ||
| </div> | ||
| ); | ||
| } | ||
|
|
||
| const root = ReactNoop.createRoot(); | ||
| await act(async () => { | ||
| root.render(<App />); | ||
| }); | ||
| assertLog(['A', 'B', 'C']); | ||
| }); | ||
| }); |
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