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feat(waitForExpect): add waitForExpect (#25)
* added waitForExpect with test * added typescript and simplified version of the waitForExpect, used and exports its typings * added initial notes about waitForExpect * fixed styling * minor stylistic change * updated tests to remove the nesting * updated readme * fixed d .md syntax * improved style Closes #21
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| import React from 'react' | ||
| import {render, waitForExpect} from '../' | ||
|
|
||
| const fetchAMessage = () => | ||
| new Promise(resolve => { | ||
| // we are using random timeout here to simulate a real-time example | ||
| // of an async operation calling a callback at a non-deterministic time | ||
| const randomTimeout = Math.floor(Math.random() * 100) | ||
| setTimeout(() => { | ||
| resolve({returnedMessage: 'Hello World'}) | ||
| }, randomTimeout) | ||
| }) | ||
|
|
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| class ComponentWithLoader extends React.Component { | ||
| state = {loading: true} | ||
| async componentDidMount() { | ||
| const data = await fetchAMessage() | ||
| this.setState({data, loading: false}) // eslint-disable-line | ||
| } | ||
| render() { | ||
| if (this.state.loading) { | ||
| return <div>Loading...</div> | ||
| } else { | ||
| return ( | ||
| <div data-testid="message"> | ||
| Loaded this message: {this.state.data.returnedMessage}! | ||
| </div> | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| test('it waits for the data to be loaded', async () => { | ||
| const {queryByText, queryByTestId} = render(<ComponentWithLoader />) | ||
|
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| expect(queryByText('Loading...')).toBeTruthy() | ||
|
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| await waitForExpect(() => expect(queryByText('Loading...')).toBeNull()) | ||
| expect(queryByTestId('message').textContent).toMatch(/Hello World/) | ||
| }) |
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