Async test example with act function

async-test-example-with-act.js

test('should let user know their input was invalid or incorrect', async () => {
	const {findByPlaceholderText, findByTestId} = render(<AuthComp />) // Or whatever you call you authentication component

	const inputElement = await findByPlaceholderText('Age') // any query function prefixed with findBy* is asynchronous

	await act(async () => {
		fireEvent.input(inputElement, {target: {value: 12}})
	})

	const validationErrorElement = await findByTestId('validation-error');

	expect(validationErrorElement).toHaveTextContent('You are too young')
})