feat(tests): update test configurations and improve mocking setup

apps/backend/test/complex/invite-complex-user.handler.test.ts

@@ -1,6 +1,5 @@
 import { beforeEach, expect, mock, test } from 'bun:test';
 
-import { createInviteComplexUserHandler } from '@/modules/complex/handlers/invite-complex-user.handler';
 import type { InviteComplexUserResponse } from '@repo/api-contract';
 
 const inviteComplexUserMock = mock(async () => undefined as unknown as InviteComplexUserResponse);
@@ -15,6 +14,10 @@ class MockComplexMembersError extends Error {
   }
 }
 
+const { createInviteComplexUserHandler } = await import(
+  '@/modules/complex/handlers/invite-complex-user.handler'
+);
+
 const inviteComplexUserHandler = createInviteComplexUserHandler({
   inviteComplexUser: inviteComplexUserMock,
   ComplexMembersError: MockComplexMembersError,
@@ -59,7 +62,6 @@ function createContext(input: {
 
 beforeEach(() => {
   inviteComplexUserMock.mockReset();
-  mock.clearAllMocks();
 });
 
 test('returns 201 with the service result', async () => {

apps/backend/test/complex/invite-complex-user.test.ts

@@ -1,14 +1,15 @@
-import { beforeEach, expect, mock, test } from 'bun:test';
+import { beforeEach, expect, test } from 'bun:test';
 
-import {
-  ComplexMembersError,
-  inviteComplexUser,
-} from '@/modules/complex/services/complex-members.service';
 import { prismaMock, sendMailMock, transactionMock } from '../support/prisma.mock';
 
+const { ComplexMembersError, inviteComplexUser } = await import(
+  '@/modules/complex/services/complex-members.service'
+);
+
 beforeEach(() => {
   prismaMock._reset();
-  mock.clearAllMocks();
+  sendMailMock.mockClear();
+  transactionMock.mockClear();
 });
 
 test('creates a pending invitation and sends the email', async () => {
@@ -21,10 +22,10 @@ test('creates a pending invitation and sends the email', async () => {
     complexId: 'complex-1',
     email: 'new.member@example.com',
     tokenHash: 'token-hash',
-    expiresAt: new Date('2026-04-29T00:00:00.000Z'),
+    expiresAt: new Date('2027-01-01T00:00:00.000Z'),
     acceptedAt: null,
     revokedAt: null,
-    createdAt: new Date('2026-04-22T00:00:00.000Z'),
+    createdAt: new Date('2026-12-01T00:00:00.000Z'),
   } as never);
 
   const result = await inviteComplexUser('admin-1', 'complex-1', {