React Toastify test snippet example

react-toastify-test-example.js

jest.useFakeTimers()

test('should inform user of task completion', () => {
    const { getByRole } = render(<App />) 

    jest.advanceTimersByTime(1000); // You can vary the time depending on how long you have set the toast in question to be visible for
    const toast = getByRole('alert') // Toasts generated by the library have a role of alert

    expect(toast).toBeInTheDocument();
})

// You can also do it like so
test('should inform user of task completion', () => {
    const { getByRole } = render(<App />)

    act(() => {
        jest.advanceTimersByTime(1000);
    })
    
    const toast = getByRole('alert')    
    expect(toast).toBeInTheDocument();
})