diff --git a/apps/backend/package.json b/apps/backend/package.json
index f482c65..4905b44 100644
--- a/apps/backend/package.json
+++ b/apps/backend/package.json
@@ -4,7 +4,7 @@
     "dev": "bun run --hot src/server.ts",
     "start": "bun src/server.ts",
     "build": "tsc -b",
-    "test": "bun test",
+    "test": "bun test --preload ./test/support/prisma.mock.ts ./test",
     "lint": "biome check .",
     "lint:fix": "biome check --write .",
     "format": "biome format --write .",
diff --git a/apps/backend/test/complex/invite-complex-user.handler.test.ts b/apps/backend/test/complex/invite-complex-user.handler.test.ts
index 6277a66..5e7ee33 100644
--- a/apps/backend/test/complex/invite-complex-user.handler.test.ts
+++ b/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 () => {
diff --git a/apps/backend/test/complex/invite-complex-user.test.ts b/apps/backend/test/complex/invite-complex-user.test.ts
index 10d59ec..9d13302 100644
--- a/apps/backend/test/complex/invite-complex-user.test.ts
+++ b/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', {
diff --git a/apps/backend/test/sport/create-sport.handler.test.ts b/apps/backend/test/sport/create-sport.handler.test.ts
index 6b4a2b5..5cff821 100644
--- a/apps/backend/test/sport/create-sport.handler.test.ts
+++ b/apps/backend/test/sport/create-sport.handler.test.ts
@@ -49,7 +49,6 @@ function createContext(body: unknown) {
 
 beforeEach(() => {
   createSportMock.mockReset();
-  mock.clearAllMocks();
 });
 
 test('returns 201 with the created sport', async () => {
diff --git a/apps/backend/test/sport/sport.service.test.ts b/apps/backend/test/sport/sport.service.test.ts
index 92e4f81..8fc85d9 100644
--- a/apps/backend/test/sport/sport.service.test.ts
+++ b/apps/backend/test/sport/sport.service.test.ts
@@ -6,7 +6,6 @@ import type { PrismaClient } from '@/generated/prisma/client';
 import type { PrismaClientMock } from 'bun-mock-prisma';
 
 const prismaMock = createPrismaMock<PrismaClient>() as PrismaClientMock<PrismaClient>;
-const uuidV7Mock = mock(() => '00000000-0000-4000-8000-000000000001');
 
 mock.module('@/lib/prisma', () => ({
   __esModule: true,
@@ -15,10 +14,7 @@ mock.module('@/lib/prisma', () => ({
   },
 }));
 
-mock.module('uuid', () => ({
-  __esModule: true,
-  v7: uuidV7Mock,
-}));
+const { uuidV7Mock } = await import('../support/prisma.mock');
 
 const { createSport, getSportById, listSports, updateSport } = await import(
   '@/modules/sport/services/sport.service'
@@ -26,7 +22,7 @@ const { createSport, getSportById, listSports, updateSport } = await import(
 
 beforeEach(() => {
   prismaMock._reset();
-  mock.clearAllMocks();
+  uuidV7Mock.mockClear();
 });
 
 test('listSports returns sports ordered by name', async () => {
diff --git a/apps/backend/test/support/prisma.mock.ts b/apps/backend/test/support/prisma.mock.ts
index 3f706a4..8249478 100644
--- a/apps/backend/test/support/prisma.mock.ts
+++ b/apps/backend/test/support/prisma.mock.ts
@@ -33,3 +33,10 @@ mock.module('@/lib/mailer', () => ({
   __esModule: true,
   sendMail: sendMailMock,
 }));
+
+export const uuidV7Mock = mock(() => '00000000-0000-4000-8000-000000000001');
+
+mock.module('uuid', () => ({
+  __esModule: true,
+  v7: uuidV7Mock,
+}));
diff --git a/bunfig.toml b/bunfig.toml
new file mode 100644
index 0000000..1ef362d
--- /dev/null
+++ b/bunfig.toml
@@ -0,0 +1,2 @@
+[test]
+preload = ["./apps/backend/test/support/prisma.mock.ts"]
diff --git a/package.json b/package.json
index c2be90e..c33d2ca 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "lint:frontend": "bun --filter frontend lint",
     "lint:frontend:fix": "bun --filter frontend lint:fix",
     "lint:backend": "bun --filter backend lint",
-    "lint:backend:fix": "bun --filter backend lint:fix"
+    "lint:backend:fix": "bun --filter backend lint:fix",
+    "test": "bun --filter backend test"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.9.4",