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test('submits form with user input', async () => { const handleSubmit = jest.fn() render(<LoginForm onSubmit={handleSubmit} />)

When components make API calls or have delays, elements appear after a delay. Use findBy or waitFor . react testing library

fireEvent.change(input, { target: { value: 'Hello' } }); test('submits form with user input', async () =&gt;

// 4. Interact (simulate user events) fireEvent.click(buttonElement); test('submits form with user input'