c2ce67c300
Verifies that window focus events don't block the main thread for >500ms, covering both single focus and rapid 5x focus (Cmd+Tab spam) scenarios. Completes the regression test requirement for the git-commands-off-main-thread fix. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
51 lines
1.8 KiB
TypeScript
51 lines
1.8 KiB
TypeScript
import { test, expect } from '@playwright/test'
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test.describe('Focus event does not freeze the UI', () => {
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test.beforeEach(async ({ page }) => {
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await page.goto('/')
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await page.waitForLoadState('networkidle')
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})
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test('window focus event completes without blocking UI for >500ms', async ({ page }) => {
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// Verify the app loaded
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await expect(page.locator('[data-testid="sidebar"]').or(page.locator('nav')).first()).toBeVisible()
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// Measure how long the UI is blocked after a focus event.
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// We dispatch focus, then immediately schedule a rAF callback.
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// If the main thread is blocked (sync IPC), the rAF callback is delayed.
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const blockMs = await page.evaluate(() => {
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return new Promise<number>((resolve) => {
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const t0 = performance.now()
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window.dispatchEvent(new Event('focus'))
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requestAnimationFrame(() => {
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resolve(performance.now() - t0)
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})
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})
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})
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// The focus handler must not block the main thread for more than 500ms.
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// Before the fix, git_pull ran synchronously and blocked for 2-3 seconds.
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expect(blockMs).toBeLessThan(500)
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})
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test('rapid focus events (5x) do not accumulate freezes', async ({ page }) => {
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await expect(page.locator('[data-testid="sidebar"]').or(page.locator('nav')).first()).toBeVisible()
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const totalMs = await page.evaluate(() => {
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return new Promise<number>((resolve) => {
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const t0 = performance.now()
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for (let i = 0; i < 5; i++) {
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window.dispatchEvent(new Event('focus'))
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}
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requestAnimationFrame(() => {
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resolve(performance.now() - t0)
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})
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})
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})
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// 5 rapid focus events should still complete in under 500ms total
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// thanks to the cooldown preventing redundant work.
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expect(totalMs).toBeLessThan(500)
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})
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})
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