React Testing Library And Jest- The Complete Guide Direct

const button = screen.getByRole('button') expect(button).toHaveTextContent('OFF')

import render, screen from '@testing-library/react' import UserProfile from './UserProfile' // Mock fetch globally global.fetch = jest.fn()

getBy for things that must exist, queryBy to check for absence, findBy for async. User Interactions Always use userEvent over fireEvent (it simulates full browser behavior). React Testing Library and Jest- The Complete Guide

if (!user) return <div>Loading...</div> return <div>user.name</div>

await user.click(button) expect(button).toHaveTextContent('OFF') ) test('shows error for invalid email', async () => const user = userEvent.setup() render(<SignupForm />) await user.type(screen.getByLabelText(/email/i), 'invalid') await user.click(screen.getByRole('button', name: /submit/i )) const button = screen

// Wait for the user name to appear expect(await screen.findByText('John Doe')).toBeInTheDocument()

const button = screen.getByRole('button', name: /click me/i ) expect(button).toBeInTheDocument() queryBy to check for absence

export default testEnvironment: 'jsdom', setupFilesAfterEnv: ['<rootDir>/src/setupTests.js'], transform: '^.+\\.(js,