95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
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import { TimerService } from '@cozy-games/utils/timer/timer.js'
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describe('TimerService.pretty', () => {
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const timer = new TimerService()
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it('returns undefined for a falsy duration', () => {
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expect(timer.pretty(0)).toBeUndefined()
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expect(timer.pretty(undefined)).toBeUndefined()
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})
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it('drops leading zero-value units', () => {
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// 1500ms -> 1 second, 5 tenths, with hours/minutes stripped
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expect(timer.pretty(1500)).toBe('01.5')
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})
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it('keeps minutes once they are non-zero', () => {
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// 65_000ms -> 1 minute 5 seconds
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expect(timer.pretty(65_000)).toBe('01:05.0')
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})
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})
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describe('TimerService.clean', () => {
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const timer = new TimerService()
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it('blanks out a zeroed unit', () => {
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expect(timer.clean('00', ':')).toBe('')
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})
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it('appends the separator to a non-zero unit', () => {
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expect(timer.clean('05', ':')).toBe('05:')
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})
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})
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describe('TimerService rendering', () => {
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let display
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beforeEach(() => {
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vi.useFakeTimers()
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display = document.createElement('span')
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})
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afterEach(() => {
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vi.useRealTimers()
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})
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it('shows 0 before the timer starts', () => {
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const timer = new TimerService()
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timer.initialize(display)
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expect(display.innerHTML).toBe('0')
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})
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it('drives updates with requestAnimationFrame, not a 1ms interval', () => {
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const raf = vi.spyOn(window, 'requestAnimationFrame')
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const interval = vi.spyOn(window, 'setInterval')
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const timer = new TimerService()
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timer.initialize(display)
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timer.start()
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expect(raf).toHaveBeenCalled()
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expect(interval).not.toHaveBeenCalled()
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})
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it('only touches the DOM when the displayed value changes', () => {
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const timer = new TimerService()
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timer.initialize(display)
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timer.start()
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let writes = 0
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const span = { set innerHTML(_v) { writes++ } }
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timer.display = span
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// Same tenth-of-a-second value across frames -> a single DOM write.
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timer.time = 1500
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timer.render()
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timer.render()
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timer.render()
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expect(writes).toBe(1)
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// A new value -> one more write.
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timer.time = 1600
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timer.render()
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expect(writes).toBe(2)
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})
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it('returns the elapsed time in milliseconds from stop()', () => {
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const timer = new TimerService()
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timer.initialize(display)
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timer.start()
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vi.advanceTimersByTime(2500)
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timer.tick()
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expect(timer.stop()).toBe(2500)
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})
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})
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