114 lines
2.7 KiB
JavaScript
114 lines
2.7 KiB
JavaScript
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
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import Timer from '../Timer';
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describe('Timer', () => {
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beforeEach(() => {
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vi.useFakeTimers();
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});
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afterEach(() => {
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vi.restoreAllMocks();
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vi.useRealTimers();
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});
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describe('constructor', () => {
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it('initializes with elapsed 0 and no interval', () => {
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const timer = new Timer();
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expect(timer.elapsed).toBe(0);
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expect(timer.intervalId).toBeNull();
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});
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it('accepts an onTick callback', () => {
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const onTick = vi.fn();
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const timer = new Timer(onTick);
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expect(timer.onTick).toBe(onTick);
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});
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});
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describe('start', () => {
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it('starts the timer and increments elapsed every second', () => {
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const timer = new Timer();
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timer.start();
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expect(timer.elapsed).toBe(0);
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vi.advanceTimersByTime(1000);
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expect(timer.elapsed).toBe(1);
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vi.advanceTimersByTime(1000);
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expect(timer.elapsed).toBe(2);
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vi.advanceTimersByTime(3000);
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expect(timer.elapsed).toBe(5);
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});
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it('calls onTick callback with elapsed value', () => {
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const onTick = vi.fn();
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const timer = new Timer(onTick);
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timer.start();
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vi.advanceTimersByTime(1000);
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expect(onTick).toHaveBeenCalledWith(1);
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vi.advanceTimersByTime(1000);
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expect(onTick).toHaveBeenCalledWith(2);
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expect(onTick).toHaveBeenCalledTimes(2);
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});
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it('resets elapsed to 0 when restarted', () => {
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const timer = new Timer();
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timer.start();
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vi.advanceTimersByTime(5000);
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expect(timer.elapsed).toBe(5);
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timer.start();
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expect(timer.elapsed).toBe(0);
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vi.advanceTimersByTime(2000);
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expect(timer.elapsed).toBe(2);
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});
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it('clears previous interval when restarted', () => {
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const timer = new Timer();
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timer.start();
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const firstIntervalId = timer.intervalId;
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timer.start();
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expect(timer.intervalId).not.toBe(firstIntervalId);
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});
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});
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describe('stop', () => {
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it('stops the timer and resets elapsed to 0', () => {
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const timer = new Timer();
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timer.start();
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vi.advanceTimersByTime(3000);
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expect(timer.elapsed).toBe(3);
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timer.stop();
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expect(timer.elapsed).toBe(0);
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expect(timer.intervalId).toBeNull();
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});
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it('prevents further increments after stopping', () => {
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const timer = new Timer();
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timer.start();
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vi.advanceTimersByTime(2000);
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timer.stop();
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vi.advanceTimersByTime(5000);
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expect(timer.elapsed).toBe(0);
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});
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it('handles stop when timer is not running', () => {
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const timer = new Timer();
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expect(() => timer.stop()).not.toThrow();
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expect(timer.elapsed).toBe(0);
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});
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});
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});
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