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test(browser:) Add test about re-sampling new traces #16730

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merged 2 commits into from
Jun 25, 2025
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Merged

test(browser:) Add test about re-sampling new traces #16730

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test(browser:) Add test about re-sampling new traces
mydea Jun 25, 2025
4a82d78
Update dev-packages/browser-integration-tests/suites/tracing/trace-li…
mydea Jun 25, 2025
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19 changes: 19 additions & 0 deletions ...ges/browser-integration-tests/suites/tracing/trace-lifetime/startNewTraceSampling/init.js
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import * as Sentry from '@sentry/browser';

window.Sentry = Sentry;

// Force this so that the initial sampleRand is consistent
Math.random = () => 0.45;

Sentry.init({
dsn: 'https://public@dsn.ingest.sentry.io/1337',
integrations: [Sentry.browserTracingIntegration()],
tracePropagationTargets: ['http://sentry-test-site.example'],
tracesSampler: ({ name }) => {
if (name === 'new-trace') {
return 0.9;
}

return 0.5;
},
});
13 changes: 13 additions & 0 deletions .../browser-integration-tests/suites/tracing/trace-lifetime/startNewTraceSampling/subject.js
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const newTraceBtn = document.getElementById('newTrace');
newTraceBtn.addEventListener('click', async () => {
Sentry.startNewTrace(() => {
// We want top ensure the new trace is sampled, so we force the sample_rand to a value above 0.9
Sentry.getCurrentScope().setPropagationContext({
...Sentry.getCurrentScope().getPropagationContext(),
sampleRand: 0.85,
});
Sentry.startSpan({ op: 'ui.interaction.click', name: 'new-trace' }, async () => {
await fetch('http://sentry-test-site.example');
});
});
});
9 changes: 9 additions & 0 deletions ...owser-integration-tests/suites/tracing/trace-lifetime/startNewTraceSampling/template.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<button id="newTrace">new Trace</button>
</body>
</html>
89 changes: 89 additions & 0 deletions ...ges/browser-integration-tests/suites/tracing/trace-lifetime/startNewTraceSampling/test.ts
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import { expect } from '@playwright/test';
import { sentryTest } from '../../../../utils/fixtures';
import type { EventAndTraceHeader } from '../../../../utils/helpers';
import {
eventAndTraceHeaderRequestParser,
getFirstSentryEnvelopeRequest,
shouldSkipTracingTest,
waitForTransactionRequest,
} from '../../../../utils/helpers';

sentryTest(
'new trace started with `startNewTrace` is sampled according to the `tracesSampler`',
async ({ getLocalTestUrl, page }) => {
if (shouldSkipTracingTest()) {
sentryTest.skip();
}

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

await page.route('http://sentry-test-site.example/**', route => {
return route.fulfill({
status: 200,
contentType: 'application/json',
body: JSON.stringify({}),
});
});

const [pageloadEvent, pageloadTraceHeaders] = await getFirstSentryEnvelopeRequest<EventAndTraceHeader>(
page,
url,
eventAndTraceHeaderRequestParser,
);

const pageloadTraceContext = pageloadEvent.contexts?.trace;

expect(pageloadEvent.type).toEqual('transaction');

expect(pageloadTraceContext).toMatchObject({
op: 'pageload',
trace_id: expect.stringMatching(/^[0-9a-f]{32}$/),
span_id: expect.stringMatching(/^[0-9a-f]{16}$/),
data: {
'sentry.sample_rate': 0.5,
},
});
expect(pageloadTraceContext).not.toHaveProperty('parent_span_id');

expect(pageloadTraceHeaders).toEqual({
environment: 'production',
public_key: 'public',
sample_rate: '0.5',
sampled: 'true',
trace_id: pageloadTraceContext?.trace_id,
sample_rand: '0.45',
});

const transactionPromise = waitForTransactionRequest(page, event => {
return event.transaction === 'new-trace';
});

await page.locator('#newTrace').click();

const [newTraceTransactionEvent, newTraceTransactionTraceHeaders] = eventAndTraceHeaderRequestParser(
await transactionPromise,
);

const newTraceTransactionTraceContext = newTraceTransactionEvent.contexts?.trace;
expect(newTraceTransactionTraceContext).toMatchObject({
op: 'ui.interaction.click',
trace_id: expect.stringMatching(/^[0-9a-f]{32}$/),
span_id: expect.stringMatching(/^[0-9a-f]{16}$/),
data: {
'sentry.sample_rate': 0.9,
},
});

expect(newTraceTransactionTraceHeaders).toEqual({
environment: 'production',
public_key: 'public',
sample_rate: '0.9',
sampled: 'true',
trace_id: newTraceTransactionTraceContext?.trace_id,
transaction: 'new-trace',
sample_rand: '0.85',
});

expect(newTraceTransactionTraceContext?.trace_id).not.toEqual(pageloadTraceContext?.trace_id);
},
);
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