Created
November 5, 2020 15:08
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import {renderHook, act} from '@testing-library/react-hooks' | |
import useCounter from '../../components/use-counter' | |
test('exposes the count and increment/decrement functions', () => { | |
const {result} = renderHook(useCounter) | |
expect(result.current.count).toBe(0) | |
act(() => result.current.increment()) | |
expect(result.current.count).toBe(1) | |
act(() => result.current.decrement()) | |
expect(result.current.count).toBe(0) | |
}) | |
test('allows customization of the initial count', () => { | |
const {result} = renderHook(useCounter, {initialProps: {initialCount: 3}}) | |
expect(result.current.count).toBe(3) | |
}) | |
test('allows customization of the step', () => { | |
const {result} = renderHook(useCounter, {initialProps: {step: 2}}) | |
expect(result.current.count).toBe(0) | |
act(() => result.current.increment()) | |
expect(result.current.count).toBe(2) | |
act(() => result.current.decrement()) | |
expect(result.current.count).toBe(0) | |
}) | |
test('the step can be changed', () => { | |
const {result, rerender} = renderHook(useCounter, { | |
initialProps: {step: 3}, | |
}) | |
expect(result.current.count).toBe(0) | |
act(() => result.current.increment()) | |
expect(result.current.count).toBe(3) | |
rerender({step: 2}) | |
act(() => result.current.decrement()) | |
expect(result.current.count).toBe(1) | |
}) |
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