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Jest mocks for React Redux
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import { useSelector, useDispatch } from 'react-redux' | |
import { render, fireEvent } from '@testing-library/react'; | |
// It can receive two more parameters, the second one is to specify a factory instead of the jest's automocking feature | |
jest.mock('react-redux') | |
it('should load some items in the component', () => { | |
// Returning a mock data from the store to test the behavior of the component | |
useSelector.mockImplementation((cb) => cb({items: ['Hello World']}) | |
const { getByTestId } = render(<List />) | |
expect(getByTestId).toContainTextElement('Hello World') | |
) | |
it('should be able to add new item', () => { | |
const { getByTestId } = render(<List />) | |
// Unused mock function that can be used to custom implementations or to test calls | |
const dispatch = jest.fn() | |
// Every time that the useDispatch be called, it's gonna call the mock function | |
useDispatch.mockReturnValue(dispatch) | |
fireEvent.change(getByTestId('input', { target: { value: 'Hello World' } }) | |
fireEvent.submit(getByTestId('form')) | |
expect(dispatch).toBeCalledWith({type: 'ADD_ITEM', payload: { item: 'Hello World'}}) | |
}) |
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