We can also check the result before and after calling act and pass an initial value to our Hook.

Let's now test the initial value of our Hook:

1. Define a new test function, passing the initial value 123 to the Hook:

test('should use initial value', () => {
    const { result } = renderHook(() => useCounter(123))

2. Now we can check if the current value equals the initial value, call increment, and ensure the count was increased from the initial value:

    expect(result.current.count).toBe(123)
    act(() => result.current.increment())
    expect(result.current.count).toBe(124)
})

As we can see, we can simply pass the initial value to the Hook and check whether the value is the same.