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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useTimer } from './useTimer.js';
describe('useTimer', () => {
beforeEach(() => {
vi.useFakeTimers();
});
afterEach(() => {
vi.restoreAllMocks();
});
it('should initialize with 0', () => {
const { result } = renderHook(() => useTimer(false, 0));
expect(result.current).toBe(0);
});
it('should not increment time if isActive is false', () => {
const { result } = renderHook(() => useTimer(false, 0));
act(() => {
vi.advanceTimersByTime(5000);
});
expect(result.current).toBe(0);
});
it('should increment time every second if isActive is true', () => {
const { result } = renderHook(() => useTimer(true, 0));
act(() => {
vi.advanceTimersByTime(1000);
});
expect(result.current).toBe(1);
act(() => {
vi.advanceTimersByTime(2000);
});
expect(result.current).toBe(3);
});
it('should reset to 0 and start incrementing when isActive becomes true from false', () => {
const { result, rerender } = renderHook(
({ isActive, resetKey }) => useTimer(isActive, resetKey),
{ initialProps: { isActive: false, resetKey: 0 } },
);
expect(result.current).toBe(0);
rerender({ isActive: true, resetKey: 0 });
expect(result.current).toBe(0); // Should reset to 0 upon becoming active
act(() => {
vi.advanceTimersByTime(1000);
});
expect(result.current).toBe(1);
});
it('should reset to 0 when resetKey changes while active', () => {
const { result, rerender } = renderHook(
({ isActive, resetKey }) => useTimer(isActive, resetKey),
{ initialProps: { isActive: true, resetKey: 0 } },
);
act(() => {
vi.advanceTimersByTime(3000); // 3s
});
expect(result.current).toBe(3);
rerender({ isActive: true, resetKey: 1 }); // Change resetKey
expect(result.current).toBe(0); // Should reset to 0
act(() => {
vi.advanceTimersByTime(1000);
});
expect(result.current).toBe(1); // Starts incrementing from 0
});
it('should be 0 if isActive is false, regardless of resetKey changes', () => {
const { result, rerender } = renderHook(
({ isActive, resetKey }) => useTimer(isActive, resetKey),
{ initialProps: { isActive: false, resetKey: 0 } },
);
expect(result.current).toBe(0);
rerender({ isActive: false, resetKey: 1 });
expect(result.current).toBe(0);
});
it('should clear timer on unmount', () => {
const { unmount } = renderHook(() => useTimer(true, 0));
const clearIntervalSpy = vi.spyOn(global, 'clearInterval');
unmount();
expect(clearIntervalSpy).toHaveBeenCalledOnce();
});
it('should preserve elapsedTime when isActive becomes false, and reset to 0 when it becomes active again', () => {
const { result, rerender } = renderHook(
({ isActive, resetKey }) => useTimer(isActive, resetKey),
{ initialProps: { isActive: true, resetKey: 0 } },
);
act(() => {
vi.advanceTimersByTime(3000); // Advance to 3 seconds
});
expect(result.current).toBe(3);
rerender({ isActive: false, resetKey: 0 });
expect(result.current).toBe(3); // Time should be preserved when timer becomes inactive
// Now make it active again, it should reset to 0
rerender({ isActive: true, resetKey: 0 });
expect(result.current).toBe(0);
act(() => {
vi.advanceTimersByTime(1000);
});
expect(result.current).toBe(1);
});
});
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