How to Test onChange Events in React Testing Library
To test onChange events in React Testing Library, use the fireEvent.change API in the following way:
import React from 'react'
import { fireEvent, render, screen } from '@testing-library/react'
describe('onChange events', () => {
it('should test onChange behavior', () => {
render(<Dropdown />)
const select = screen.getByRole('select')
const testingLibrary = screen.getByRole('option', { name: 'React Testing Library' })
const jest = screen.getByRole('option', { name: 'Jest' })
fireEvent.change(select, { target: { value: '🐙' } })
expect(select.value).toBe('🐙')
expect(testingLibrary.selected).toBe(true)
fireEvent.change(select, { target: { value: '🎴' } })
expect(select.value).toBe('🎴')
expect(jest.selected).toBe(true)
})
})Copied to clipboard!
To select an option from an HTML select element, you will need to grab the element with either screen.getByTestId or screen.getByRole, and pass it over to fireEvent.change with a target.value object for targeting the right option.
Notice that you can also grab elements by specifying the value of their attributes inside an object, passed as a second parameter to screen.getByRole.
Finally, to test if the correct element is selected, we can use select.value and option.selected for assertions.
expect(select.value).toBe('🎴')
expect(jest.selected).toBe(true)Copied to clipboard!
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