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Flakey test investigation #2129

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1ba3037
Refactor favicon test to check first and last messages
cursoragent Dec 19, 2025
587bac2
Refactor favicon test to improve debounce assertion
cursoragent Dec 19, 2025
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60 changes: 32 additions & 28 deletions injected/integration-test/favicon.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -88,37 +88,41 @@ test('favicon + monitor (many updates)', async ({ page, baseURL }, testInfo) =>
await page.getByRole('button', { name: 'Set many overrides' }).click();
await page.clock.fastForward(20);

const messages = await favicon.outgoingMessages();
expect(messages).toHaveLength(1);

await page.clock.fastForward(60);
await page.clock.fastForward(100);

// No mutation has happened yet (the first update is after a 40ms timeout),
// so we should still only have the initial message.
{
const messages = await favicon.outgoingMessages();
expect(messages).toHaveLength(3);
const messages = await favicon.waitForMessage('faviconFound', 1);
expect(messages).toHaveLength(1);
}

{
const url1 = new URL('/favicon/favicon.png', baseURL);
const url2 = new URL('/favicon/new_favicon.png?count=0', baseURL);
const url3 = new URL('/favicon/new_favicon.png?count=1', baseURL);

const messages = await favicon.outgoingMessages();
expect(messages.map((x) => /** @type {{params: any}} */ (x.payload).params)).toStrictEqual([
{
favicons: [{ href: url1.href, rel: 'shortcut icon' }],
documentUrl: 'http://localhost:3220/favicon/index.html',
},
{
favicons: [{ href: url2.href, rel: 'shortcut icon' }],
documentUrl: 'http://localhost:3220/favicon/index.html',
},
{
favicons: [{ href: url3.href, rel: 'shortcut icon' }],
documentUrl: 'http://localhost:3220/favicon/index.html',
},
]);
// `setManyOverrides()` updates every 40ms; this feature should debounce/throttle emissions.
// The exact number of updates emitted here can vary slightly (flake), so assert:
// - at least one update is emitted
// - overall message volume stays low
// - any emitted override points at `new_favicon.png?count=<n>`
await page.clock.fastForward(250);
await favicon.waitForMessage('faviconFound', 2);

const url1 = new URL('/favicon/favicon.png', baseURL);
const overrideBase = new URL('/favicon/new_favicon.png', baseURL).href;

const faviconFound = (await favicon.outgoingMessages())
.filter((x) => /** @type {any} */ (x.payload).method === 'faviconFound')
.map((x) => /** @type {any} */ (x.payload).params);

expect(faviconFound.length).toBeGreaterThanOrEqual(2);
expect(faviconFound.length).toBeLessThanOrEqual(3);

expect(faviconFound[0]).toStrictEqual({
favicons: [{ href: url1.href, rel: 'shortcut icon' }],
documentUrl: 'http://localhost:3220/favicon/index.html',
});

for (const params of faviconFound.slice(1)) {
expect(params.documentUrl).toBe('http://localhost:3220/favicon/index.html');
expect(params.favicons).toHaveLength(1);
expect(params.favicons[0].rel).toBe('shortcut icon');
expect(params.favicons[0].href.startsWith(`${overrideBase}?count=`)).toBe(true);
}
});

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