diff --git a/nestjs-BE/server/src/users/dto/create-user.dto.ts b/nestjs-BE/server/src/users/dto/create-user.dto.ts
index 800cad26..9e8fe879 100644
--- a/nestjs-BE/server/src/users/dto/create-user.dto.ts
+++ b/nestjs-BE/server/src/users/dto/create-user.dto.ts
@@ -1,3 +1,3 @@
-export class CreateUserDto {
+export class CreateUserPrismaDto {
   readonly email: string;
 }
diff --git a/nestjs-BE/server/src/users/users.service.spec.ts b/nestjs-BE/server/src/users/users.service.spec.ts
index 59fae04a..81f58428 100644
--- a/nestjs-BE/server/src/users/users.service.spec.ts
+++ b/nestjs-BE/server/src/users/users.service.spec.ts
@@ -2,6 +2,7 @@ import { Test, TestingModule } from '@nestjs/testing';
 import { UsersService } from './users.service';
 import { PrismaService } from '../prisma/prisma.service';
 import { v4 as uuid } from 'uuid';
+import { KakaoUser, User } from '@prisma/client';
 
 describe('UsersService', () => {
   let usersService: UsersService;
@@ -9,40 +10,63 @@ describe('UsersService', () => {
 
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
-      providers: [UsersService, PrismaService],
+      providers: [
+        UsersService,
+        {
+          provide: PrismaService,
+          useValue: {
+            $transaction: jest.fn(),
+            user: { create: jest.fn(), findUnique: jest.fn() },
+            kakaoUser: { create: jest.fn(), findUnique: jest.fn() },
+          },
+        },
+      ],
     }).compile();
 
     usersService = module.get<UsersService>(UsersService);
     prisma = module.get<PrismaService>(PrismaService);
-
-    await prisma.kakaoUser.deleteMany({});
-    await prisma.user.deleteMany({});
   });
 
-  it('getOrCreateUser', async () => {
-    const testUserUuid = uuid();
-    const testEmail = 'test@email.com';
-    const testUser = { uuid: testUserUuid };
-    await prisma.user.create({
-      data: { uuid: testUserUuid },
-    });
-    await prisma.kakaoUser.create({
-      data: {
-        email: testEmail,
-        userUuid: testUserUuid,
-      },
-    });
-
-    const user = usersService.getOrCreateUser({ email: testEmail });
+  it('getOrCreateUser user exist', async () => {
+    const testUser: User = { uuid: uuid() };
+    const testKakaoUser: KakaoUser = {
+      id: 0,
+      email: 'test@email.com',
+      userUuid: testUser.uuid,
+    };
+
+    jest
+      .spyOn(prisma, '$transaction')
+      .mockImplementation(async (callback) => callback(prisma));
+    jest.spyOn(prisma.kakaoUser, 'findUnique').mockResolvedValue(testKakaoUser);
+    jest.spyOn(prisma.user, 'findUnique').mockResolvedValue(testUser);
+
+    const user = usersService.getOrCreateUser({ email: testKakaoUser.email });
+
     await expect(user).resolves.toEqual(testUser);
+    expect(prisma.user.create).not.toHaveBeenCalled();
+    expect(prisma.user.findUnique).toHaveBeenCalled();
   });
 
   it("getOrCreateUser user doesn't exist", async () => {
-    const testEmail = 'test@email.com';
+    const newUser: User = { uuid: uuid() };
+    const newKakaoUser: KakaoUser = {
+      id: 0,
+      email: 'test@email.com',
+      userUuid: newUser.uuid,
+    };
+
+    jest
+      .spyOn(prisma, '$transaction')
+      .mockImplementation(async (callback) => callback(prisma));
+    jest.spyOn(prisma.kakaoUser, 'findUnique').mockResolvedValue(null);
+    jest.spyOn(prisma.kakaoUser, 'create').mockResolvedValue(newKakaoUser);
+    jest.spyOn(prisma.user, 'create').mockResolvedValue(newUser);
+
+    const user = usersService.getOrCreateUser({ email: newKakaoUser.email });
 
-    const user = await usersService.getOrCreateUser({ email: testEmail });
-    expect(user.uuid).toMatch(
-      /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/,
-    );
+    await expect(user).resolves.toEqual(newUser);
+    expect(prisma.user.create).toHaveBeenCalled();
+    expect(prisma.user.findUnique).not.toHaveBeenCalled();
   });
 });
diff --git a/nestjs-BE/server/src/users/users.service.ts b/nestjs-BE/server/src/users/users.service.ts
index e04bd8d1..72f28a0a 100644
--- a/nestjs-BE/server/src/users/users.service.ts
+++ b/nestjs-BE/server/src/users/users.service.ts
@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
-import { CreateUserDto } from './dto/create-user.dto';
+import { CreateUserPrismaDto } from './dto/create-user.dto';
 import { User } from '@prisma/client';
 import { v4 as uuid } from 'uuid';
 
@@ -8,7 +8,7 @@ import { v4 as uuid } from 'uuid';
 export class UsersService {
   constructor(private prisma: PrismaService) {}
 
-  async getOrCreateUser(data: CreateUserDto): Promise<User> {
+  async getOrCreateUser(data: CreateUserPrismaDto): Promise<User> {
     return this.prisma.$transaction(async () => {
       const kakaoUser = await this.prisma.kakaoUser.findUnique({
         where: { email: data.email },