| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @jest-environment node |
| 8 | */ |
| 9 | |
| 10 | // sanity tests for act() |
| 11 | |
| 12 | const React = require('react'); |
| 13 | const ReactNoop = require('react-noop-renderer'); |
| 14 | const Scheduler = require('scheduler'); |
| 15 | const act = require('internal-test-utils').act; |
| 16 | const {assertLog, waitForAll} = require('internal-test-utils'); |
| 17 | |
| 18 | // TODO: These tests are no longer specific to the noop renderer |
| 19 | // implementation. They test the internal implementation we use in the React |
| 20 | // test suite. |
| 21 | describe('internal act()', () => { |
| 22 | it('can use act to flush effects', async () => { |
| 23 | function App(props) { |
| 24 | React.useEffect(props.callback); |
| 25 | return null; |
| 26 | } |
| 27 | |
| 28 | const calledLog = []; |
| 29 | await act(() => { |
| 30 | ReactNoop.render( |
| 31 | <App |
| 32 | callback={() => { |
| 33 | calledLog.push(calledLog.length); |
| 34 | }} |
| 35 | />, |
| 36 | ); |
| 37 | }); |
| 38 | await waitForAll([]); |
| 39 | expect(calledLog).toEqual([0]); |
| 40 | }); |
| 41 | |
| 42 | it('should work with async/await', async () => { |
| 43 | function App() { |
| 44 | const [ctr, setCtr] = React.useState(0); |
| 45 | async function someAsyncFunction() { |
| 46 | Scheduler.log('stage 1'); |
| 47 | await null; |
| 48 | Scheduler.log('stage 2'); |
| 49 | await null; |
| 50 | setCtr(1); |
| 51 | } |
| 52 | React.useEffect(() => { |
| 53 | someAsyncFunction(); |
| 54 | }, []); |
| 55 | return ctr; |
| 56 | } |
| 57 | await act(() => { |
| 58 | ReactNoop.render(<App />); |
| 59 | }); |
| 60 | assertLog(['stage 1', 'stage 2']); |
| 61 | await waitForAll([]); |
| 62 | expect(ReactNoop).toMatchRenderedOutput('1'); |
| 63 | }); |
| 64 | }); |