Fix: Wait for session before navigating to avoid race condition

Co-authored-by: aprasad <aprasad@sentry.io>

Author: cursoragent

dev-packages/browser-integration-tests/suites/sessions/initial-scope/test.ts

@@ -2,7 +2,7 @@ import type { Route } from '@playwright/test';
 import { expect } from '@playwright/test';
 import type { SessionContext } from '@sentry/core';
 import { sentryTest } from '../../../utils/fixtures';
-import { getFirstSentryEnvelopeRequest } from '../../../utils/helpers';
+import { getFirstSentryEnvelopeRequest, waitForSession } from '../../../utils/helpers';
 
 sentryTest('should start a new session on pageload.', async ({ getLocalTestUrl, page }) => {
   const url = await getLocalTestUrl({ testDir: __dirname });
@@ -22,9 +22,12 @@ sentryTest('should start a new session with navigation.', async ({ getLocalTestU
 
   const initSession = await getFirstSentryEnvelopeRequest<SessionContext>(page, url);
 
+  // Set up session listener BEFORE clicking to avoid race condition
+  // between the click-triggered navigation and a second page.goto() call
+  const newSessionPromise = waitForSession(page);
   await page.click('#navigate');
 
-  const newSession = await getFirstSentryEnvelopeRequest<SessionContext>(page, url);
+  const newSession = await newSessionPromise;
 
   expect(newSession).toBeDefined();
   expect(newSession.init).toBe(true);