| 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 | |
| 8 | import {render, screen, fireEvent} from '@testing-library/react'; |
| 9 | import * as React from 'react'; |
| 10 | import {useState} from 'react'; |
| 11 | import {expectLogsAndClear, log} from './expectLogs'; |
| 12 | |
| 13 | function Counter() { |
| 14 | let [state, setState] = useState(0); |
| 15 | return ( |
| 16 | <div> |
| 17 | <Title text="Counter" /> |
| 18 | <span>{state}</span> |
| 19 | <button data-testid="button" onClick={() => setState(state + 1)}> |
| 20 | increment |
| 21 | </button> |
| 22 | </div> |
| 23 | ); |
| 24 | } |
| 25 | |
| 26 | function Title({text}) { |
| 27 | log(`rendering: ${text}`); |
| 28 | return <h1>{text}</h1>; |
| 29 | } |
| 30 | |
| 31 | test('use-state', async () => { |
| 32 | const {asFragment} = render(<Counter />); |
| 33 | |
| 34 | expect(asFragment()).toMatchInlineSnapshot(` |
| 35 | <DocumentFragment> |
| 36 | <div> |
| 37 | <h1> |
| 38 | Counter |
| 39 | </h1> |
| 40 | <span> |
| 41 | 0 |
| 42 | </span> |
| 43 | <button |
| 44 | data-testid="button" |
| 45 | > |
| 46 | increment |
| 47 | </button> |
| 48 | </div> |
| 49 | </DocumentFragment> |
| 50 | `); |
| 51 | |
| 52 | expectLogsAndClear(['rendering: Counter']); |
| 53 | |
| 54 | fireEvent.click(screen.getByTestId('button')); |
| 55 | await screen.findByText('1'); |
| 56 | |
| 57 | expectLogsAndClear(__FORGET__ ? [] : ['rendering: Counter']); |
| 58 | }); |