diff --git a/packages/backend/server/src/__tests__/models/user.spec.ts b/packages/backend/server/src/__tests__/models/user.spec.ts
index a7a590c51..6109cc143 100644
--- a/packages/backend/server/src/__tests__/models/user.spec.ts
+++ b/packages/backend/server/src/__tests__/models/user.spec.ts
@@ -5,7 +5,7 @@ import { EmailAlreadyUsed, EventBus } from '../../base';
 import { WorkspaceRole } from '../../core/permission';
 import { UserModel } from '../../models/user';
 import { WorkspaceMemberStatus } from '../../models/workspace';
-import { createTestingModule, type TestingModule } from '../utils';
+import { createTestingModule, sleep, type TestingModule } from '../utils';
 
 interface Context {
   module: TestingModule;
@@ -272,6 +272,9 @@ test('should trigger user.deleted event', async t => {
   t.true(
     spy.calledOnceWithExactly({ ...user, ownedWorkspaces: ['test-workspace'] })
   );
+  // await for 'user.deleted' event to be emitted and executed
+  // avoid race condition cause database dead lock
+  await sleep(100);
 });
 
 test('should paginate users', async t => {
diff --git a/packages/backend/server/src/__tests__/utils/testing-app.ts b/packages/backend/server/src/__tests__/utils/testing-app.ts
index 2271c547d..2bc499656 100644
--- a/packages/backend/server/src/__tests__/utils/testing-app.ts
+++ b/packages/backend/server/src/__tests__/utils/testing-app.ts
@@ -156,8 +156,15 @@ export class TestingApp extends ApplyType<INestApplication>() {
       .send({
         query,
         variables,
-      })
-      .expect(200);
+      });
+
+    if (res.status !== 200) {
+      throw new Error(
+        `Failed to execute gql: ${query}, status: ${res.status}, body: ${JSON.stringify(
+          res.body
+        )}`
+      );
+    }
 
     if (res.body.errors?.length) {
       throw new Error(res.body.errors[0].message);