update test

Author: RulaKhaled

packages/cloudflare/test/request.test.ts

@@ -90,10 +90,15 @@ describe('withSentry', () => {
   });
 
   test('flush must be called when all waitUntil are done', async () => {
-    const flushSpy = vi.spyOn(SentryCore.Client.prototype, 'flush');
+    // Reset all mocks to ensure clean state
+    vi.clearAllMocks();
+    vi.restoreAllMocks();
+
+    const flushSpy = vi.spyOn(SentryCore.Client.prototype, 'flush').mockResolvedValue(true);
     vi.useFakeTimers();
     onTestFinished(() => {
       vi.useRealTimers();
+      flushSpy.mockRestore();
     });
     const waits: Promise<unknown>[] = [];
     const waitUntil = vi.fn(promise => waits.push(promise));