add basic failing transaction test

Author: nicohrubec

dev-packages/e2e-tests/test-applications/tanstackstart-react/tests/transaction.test.ts

@@ -0,0 +1,20 @@
+import { expect, test } from '@playwright/test';
+import { waitForTransaction } from '@sentry-internal/test-utils';
+
+test('Sends a server function transaction', async ({ page }) => {
+  const transactionEventPromise = waitForTransaction('tanstackstart-react', transactionEvent => {
+    return transactionEvent?.contexts?.trace?.op === 'http.server' && transactionEvent?.transaction === 'GET /';
+  });
+
+  await page.goto('/');
+
+  await expect(page.locator('button').filter({ hasText: 'Break server function' })).toBeVisible();
+
+  await page.locator('button').filter({ hasText: 'Break server function' }).click();
+
+  const transactionEvent = await transactionEventPromise;
+
+  // TODO: verify correct span data
+  expect(Array.isArray(transactionEvent?.spans)).toBe(true);
+  expect(transactionEvent?.spans?.length).toBeGreaterThan(0);
+});