1.simplest-hook.spec.ts

import { renderHook, act } from '@testing-library/react-hooks';
import { useSimplestHook } from './1.simplest-hook';

it('should set to true', () => {
    const { result } = renderHook(() => useSimplestHook());

    expect(result.current.isTrue).toBe(false);

    act(() => {
        result.current.toggle();
    });

    expect(result.current.isTrue).toBe(true);
});

it('should set to true after 1 second', async () => {
    const { result, waitForNextUpdate } = renderHook(() => useSimplestHook());

    expect(result.current.isTrue).toBe(false);

    await waitForNextUpdate();

    expect(result.current.isTrue).toBe(true);
});