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* Remove `jest` global check in concurrent roots In concurrent mode, instead of checking `jest`, we check the new `IS_REACT_ACT_ENVIRONMENT` global. The default behavior is `false`. Legacy mode behavior is unchanged. React's own internal test suite use a custom version of `act` that works by mocking the Scheduler — rather than the "real" act used publicly. So we don't enable the flag in our repo. * Warn if `act` is called in wrong environment Adds a warning if `act` is called but `IS_REACT_ACT_ENVIRONMENT` is not enabled. The goal is to prompt users to correctly configure their testing environment, so that if they forget to use `act` in a different test, we can detect and warn about. It's expected that the environment flag will be configured by the testing framework. For example, a Jest plugin. We will link to the relevant documentation page, once it exists. The warning only fires in concurrent mode. Legacy roots will keep the existing behavior.
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packages/react-reconciler/src/__tests__/ReactActWarnings-test.js
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/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
* @jest-environment node | ||
*/ | ||
|
||
let React; | ||
let Scheduler; | ||
let ReactNoop; | ||
let useState; | ||
let act; | ||
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// These tests are mostly concerned with concurrent roots. The legacy root | ||
// behavior is covered by other older test suites and is unchanged from | ||
// React 17. | ||
describe('act warnings', () => { | ||
beforeEach(() => { | ||
jest.resetModules(); | ||
React = require('react'); | ||
Scheduler = require('scheduler'); | ||
ReactNoop = require('react-noop-renderer'); | ||
act = React.unstable_act; | ||
useState = React.useState; | ||
}); | ||
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function Text(props) { | ||
Scheduler.unstable_yieldValue(props.text); | ||
return props.text; | ||
} | ||
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function withActEnvironment(value, scope) { | ||
const prevValue = global.IS_REACT_ACT_ENVIRONMENT; | ||
global.IS_REACT_ACT_ENVIRONMENT = value; | ||
try { | ||
return scope(); | ||
} finally { | ||
global.IS_REACT_ACT_ENVIRONMENT = prevValue; | ||
} | ||
} | ||
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test('warns about unwrapped updates only if environment flag is enabled', () => { | ||
let setState; | ||
function App() { | ||
const [state, _setState] = useState(0); | ||
setState = _setState; | ||
return <Text text={state} />; | ||
} | ||
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const root = ReactNoop.createRoot(); | ||
root.render(<App />); | ||
expect(Scheduler).toFlushAndYield([0]); | ||
expect(root).toMatchRenderedOutput('0'); | ||
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// Default behavior. Flag is undefined. No warning. | ||
expect(global.IS_REACT_ACT_ENVIRONMENT).toBe(undefined); | ||
setState(1); | ||
expect(Scheduler).toFlushAndYield([1]); | ||
expect(root).toMatchRenderedOutput('1'); | ||
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// Flag is true. Warn. | ||
withActEnvironment(true, () => { | ||
expect(() => setState(2)).toErrorDev( | ||
'An update to App inside a test was not wrapped in act', | ||
); | ||
expect(Scheduler).toFlushAndYield([2]); | ||
expect(root).toMatchRenderedOutput('2'); | ||
}); | ||
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// Flag is false. No warning. | ||
withActEnvironment(false, () => { | ||
setState(3); | ||
expect(Scheduler).toFlushAndYield([3]); | ||
expect(root).toMatchRenderedOutput('3'); | ||
}); | ||
}); | ||
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// @gate __DEV__ | ||
test('act warns if the environment flag is not enabled', () => { | ||
let setState; | ||
function App() { | ||
const [state, _setState] = useState(0); | ||
setState = _setState; | ||
return <Text text={state} />; | ||
} | ||
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const root = ReactNoop.createRoot(); | ||
root.render(<App />); | ||
expect(Scheduler).toFlushAndYield([0]); | ||
expect(root).toMatchRenderedOutput('0'); | ||
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// Default behavior. Flag is undefined. Warn. | ||
expect(global.IS_REACT_ACT_ENVIRONMENT).toBe(undefined); | ||
expect(() => { | ||
act(() => { | ||
setState(1); | ||
}); | ||
}).toErrorDev( | ||
'The current testing environment is not configured to support act(...)', | ||
{withoutStack: true}, | ||
); | ||
expect(Scheduler).toHaveYielded([1]); | ||
expect(root).toMatchRenderedOutput('1'); | ||
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// Flag is true. Don't warn. | ||
withActEnvironment(true, () => { | ||
act(() => { | ||
setState(2); | ||
}); | ||
expect(Scheduler).toHaveYielded([2]); | ||
expect(root).toMatchRenderedOutput('2'); | ||
}); | ||
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// Flag is false. Warn. | ||
withActEnvironment(false, () => { | ||
expect(() => { | ||
act(() => { | ||
setState(1); | ||
}); | ||
}).toErrorDev( | ||
'The current testing environment is not configured to support act(...)', | ||
{withoutStack: true}, | ||
); | ||
expect(Scheduler).toHaveYielded([1]); | ||
expect(root).toMatchRenderedOutput('1'); | ||
}); | ||
}); | ||
}); |
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