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fix(test): Unflake LCP test #13741

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Sep 23, 2024
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fix(test): Unflake LCP test #13741

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37 changes: 22 additions & 15 deletions dev-packages/browser-integration-tests/suites/tracing/metrics/handlers-lcp/test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,32 +20,39 @@ sentryTest(
);

const url = await getLocalTestPath({ testDir: __dirname });

const [eventData] = await Promise.all([
getFirstSentryEnvelopeRequest<Event>(page),
page.goto(url),
page.click('button'),
page.locator('button').click(),
]);

expect(eventData.measurements).toBeDefined();
expect(eventData.measurements?.lcp?.value).toBeDefined();

expect(eventData.contexts?.trace?.data?.['lcp.element']).toBe('body > img');
expect(eventData.contexts?.trace?.data?.['lcp.size']).toBe(107400);
expect(eventData.contexts?.trace?.data?.['lcp.url']).toBe('https://example.com/path/to/image.png');
// This should be body > img, but it can be flakey as sometimes it will report
// the button as LCP.
expect(eventData.contexts?.trace?.data?.['lcp.element'].startsWith('body >')).toBe(true);

// Working around flakiness
// Only testing this when the LCP element is an image, not a button
if (eventData.contexts?.trace?.data?.['lcp.element'] === 'body > img') {
expect(eventData.contexts?.trace?.data?.['lcp.size']).toBe(107400);

const lcp = await (await page.waitForFunction('window._LCP')).jsonValue();
const lcp2 = await (await page.waitForFunction('window._LCP2')).jsonValue();
const lcp3 = await page.evaluate('window._LCP3');
const lcp = await (await page.waitForFunction('window._LCP')).jsonValue();
const lcp2 = await (await page.waitForFunction('window._LCP2')).jsonValue();
const lcp3 = await page.evaluate('window._LCP3');

expect(lcp).toEqual(107400);
expect(lcp2).toEqual(107400);
// this has not been triggered yet
expect(lcp3).toEqual(undefined);
expect(lcp).toEqual(107400);
expect(lcp2).toEqual(107400);
// this has not been triggered yet
expect(lcp3).toEqual(undefined);

// Adding a handler after LCP is completed still triggers the handler
await page.evaluate('window.ADD_HANDLER()');
const lcp3_2 = await (await page.waitForFunction('window._LCP3')).jsonValue();
// Adding a handler after LCP is completed still triggers the handler
await page.evaluate('window.ADD_HANDLER()');
const lcp3_2 = await (await page.waitForFunction('window._LCP3')).jsonValue();

expect(lcp3_2).toEqual(107400);
expect(lcp3_2).toEqual(107400);
}
},
);
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