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docs: add test example for context. (#60)
* Add Test and add myself to list of contributors * Change getByTestId to getByText * Chage how value is set on Provider because it is better on performance * Add test to list of examples in README
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| import React from 'react' | ||
| import {render, Simulate} from '../' | ||
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| const StateContext = React.createContext() | ||
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| const MyButton = () => ( | ||
| <StateContext.Consumer> | ||
| {({handleToggle}) => <button onClick={handleToggle}>Push Me</button>} | ||
| </StateContext.Consumer> | ||
| ) | ||
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| const SecretMessage = () => ( | ||
| <StateContext.Consumer> | ||
| {({toggleStatus}) => <h1>{toggleStatus ? 'Secret Message' : 'Hidden'}</h1>} | ||
| </StateContext.Consumer> | ||
| ) | ||
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| class Container extends React.Component { | ||
| handleToggle = () => { | ||
| this.setState(prevState => ({ | ||
| toggleStatus: !prevState.toggleStatus, | ||
| })) | ||
| } | ||
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| state = { | ||
| toggleStatus: false, | ||
| handleToggle: this.handleToggle, | ||
| } | ||
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| render() { | ||
| return ( | ||
| <div> | ||
| <StateContext.Provider value={this.state}> | ||
| <MyButton /> | ||
| <SecretMessage /> | ||
| </StateContext.Provider> | ||
| </div> | ||
| ) | ||
| } | ||
| } | ||
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| test('Component renders with the correct message then correctly changes message after clicking button', () => { | ||
| const {getByText} = render(<Container />) | ||
| expect(getByText('Hidden').textContent).toBe('Hidden') | ||
| Simulate.click(getByText('Push Me')) | ||
| expect(getByText('Secret Message').textContent).toBe('Secret Message') | ||
| }) |