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chore: add basic test suite for hooks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| module.exports = { | ||
| presets: ['module:metro-react-native-babel-preset'], | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| import React from 'react'; | ||
| import { Button, Text } from 'react-native'; | ||
| import { | ||
| act, | ||
| fireEvent, | ||
| render, | ||
| renderHook, | ||
| screen, | ||
| } from '@testing-library/react-native'; | ||
| import { MMKV, useMMKVNumber, useMMKVString } from '../src'; | ||
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| const mmkv = new MMKV(); | ||
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| beforeEach(() => { | ||
| mmkv.clearAll(); | ||
| }); | ||
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| test('hooks update when the value is changed directly through the instance', () => { | ||
| const { result } = renderHook(() => useMMKVString('string-key', mmkv)); | ||
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| expect(result.current[0]).toBeUndefined(); | ||
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| // First, make a "normal" change | ||
| act(() => { | ||
| result.current[1]('value 1'); | ||
| }); | ||
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| expect(result.current[0]).toStrictEqual('value 1'); | ||
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| // Now, make the change directly through the instance. | ||
| act(() => { | ||
| mmkv.set('string-key', 'value 2'); | ||
| }); | ||
| expect(result.current[0]).toStrictEqual('value 2'); | ||
| }); | ||
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| test('functional updates to hooks', () => { | ||
| const Component: React.FC = () => { | ||
| const [state, setState] = React.useState(0); | ||
| const [value, setValue] = useMMKVNumber('number-key', mmkv); | ||
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| return ( | ||
| <> | ||
| <Button | ||
| testID="button" | ||
| title="Double Increment Me" | ||
| onPress={() => { | ||
| // Increment the state value twice, using the function form of useState. | ||
| setState((current) => current + 1); | ||
| setState((current) => current + 1); | ||
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| // Increment the MMKV value twice, using the same function form. | ||
| setValue((current) => (current ?? 0) + 1); | ||
| setValue((current) => (current ?? 0) + 1); | ||
| }} | ||
| /> | ||
| <Text testID="state-value">State: {state.toString()}</Text> | ||
| <Text testID="mmkv-value">MMKV: {(value ?? 0).toString()}</Text> | ||
| </> | ||
| ); | ||
| }; | ||
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| render(<Component />); | ||
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| const button = screen.getByTestId('button'); | ||
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| // Why these assertions: | ||
| // https://github.com/mrousavy/react-native-mmkv/issues/599 | ||
| fireEvent.press(button); | ||
| expect(screen.getByTestId('state-value').children).toStrictEqual([ | ||
| 'State: ', | ||
| '2', | ||
| ]); | ||
| expect(screen.getByTestId('mmkv-value').children).toStrictEqual([ | ||
| 'MMKV: ', | ||
| '2', | ||
| ]); | ||
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| fireEvent.press(button); | ||
| expect(screen.getByTestId('state-value').children).toStrictEqual([ | ||
| 'State: ', | ||
| '4', | ||
| ]); | ||
| expect(screen.getByTestId('mmkv-value').children).toStrictEqual([ | ||
| 'MMKV: ', | ||
| '4', | ||
| ]); | ||
| }); |
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