同步 sgs-frontend-mobile 源码

tests/unit/BackgroundPreloadScheduler.spec.ts

@@ -0,0 +1,95 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import {
+  createBackgroundPreloadScheduler,
+  getBackgroundPreloadPolicy
+} from '@/services/performance/backgroundPreloadScheduler'
+
+describe('backgroundPreloadScheduler', () => {
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('waits for an idle window after the defer delay', () => {
+    vi.useFakeTimers()
+    let idleCallback: (() => void) | null = null
+    const task = vi.fn()
+    const scheduler = createBackgroundPreloadScheduler({
+      setTimeout,
+      clearTimeout,
+      requestIdleCallback: (callback) => {
+        idleCallback = () => callback({ didTimeout: false })
+        return 1
+      },
+      cancelIdleCallback: vi.fn()
+    })
+
+    expect(scheduler.schedule(task, { delayMs: 500 })).toBe(true)
+    vi.advanceTimersByTime(499)
+    expect(task).not.toHaveBeenCalled()
+
+    vi.advanceTimersByTime(1)
+    expect(task).not.toHaveBeenCalled()
+    idleCallback?.()
+    expect(task).toHaveBeenCalledTimes(1)
+  })
+
+  it('cancels work that has not entered the idle window', () => {
+    vi.useFakeTimers()
+    const task = vi.fn()
+    const scheduler = createBackgroundPreloadScheduler({
+      setTimeout,
+      clearTimeout,
+      requestIdleCallback: vi.fn(() => 1),
+      cancelIdleCallback: vi.fn()
+    })
+
+    scheduler.schedule(task, { delayMs: 500 })
+    scheduler.cancel()
+    vi.advanceTimersByTime(1000)
+
+    expect(task).not.toHaveBeenCalled()
+  })
+
+  it('skips background work for data-saving and slow-network connections', () => {
+    expect(getBackgroundPreloadPolicy({ saveData: true })).toEqual({
+      allowed: false,
+      reason: 'save-data',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '2g' })).toEqual({
+      allowed: false,
+      reason: 'slow-network',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: 'slow-2g' })).toEqual({
+      allowed: false,
+      reason: 'slow-network',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '4g', downlink: 1.49, rtt: 80 })).toEqual({
+      allowed: false,
+      reason: 'slow-network',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '4g', downlink: 8, rtt: 500 })).toEqual({
+      allowed: false,
+      reason: 'slow-network',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '3g', downlink: 1.2, rtt: 120 })).toEqual({
+      allowed: false,
+      reason: 'slow-network',
+      delayMs: 0
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '3g' })).toEqual({
+      allowed: true,
+      reason: 'normal',
+      delayMs: 2400
+    })
+    expect(getBackgroundPreloadPolicy({ effectiveType: '4g', downlink: 1.5, rtt: 499 })).toEqual({
+      allowed: true,
+      reason: 'normal',
+      delayMs: 900
+    })
+  })
+})