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Merge pull request #41 from nickovchinnikov/nick/useEffect
Nick/useState
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| import React from 'react'; | ||
| import { render, screen, fireEvent } from '@testing-library/react'; | ||
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| import { ClickCounter } from './ClickCounter'; | ||
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| describe('Test ClickCounter', () => { | ||
| it('should inc/dec counter when buttons inc/dec clicked', () => { | ||
| render(<ClickCounter />); | ||
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| const counter = screen.getByRole('heading'); | ||
| const increaseBtn = screen.getByRole('button', { name: 'Increase' }); | ||
| const decreaseBtn = screen.getByRole('button', { name: 'Decrease' }); | ||
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| expect(counter.textContent).toBe('Counter: 0'); | ||
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| fireEvent.click(increaseBtn); | ||
| expect(counter.textContent).toBe('Counter: 1'); | ||
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| fireEvent.click(increaseBtn); | ||
| expect(counter.textContent).toBe('Counter: 2'); | ||
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| fireEvent.click(decreaseBtn); | ||
| expect(counter.textContent).toBe('Counter: 1'); | ||
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| fireEvent.click(decreaseBtn); | ||
| expect(counter.textContent).toBe('Counter: 0'); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| import React, { FC, useState } from 'react'; | ||
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| interface Props { | ||
| defaultCount?: number; | ||
| } | ||
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| export const ClickCounter: FC<Props> = ({ defaultCount = 0 }) => { | ||
| const [count, setCount] = useState(defaultCount); | ||
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| return ( | ||
| <div> | ||
| <h1>Counter: {count}</h1> | ||
| <button onClick={() => setCount(count + 1)}>Increase</button> | ||
| <button onClick={() => setCount(count - 1)}>Decrease</button> | ||
| </div> | ||
| ); | ||
| }; |