feat: ✨ add GetUserUsecase

libs/user/usecase/src/lib/get-user.usecase.spec.ts

@@ -0,0 +1,49 @@
+import { GetUserUsecase } from './get-user.usecase';
+import { UserRepository } from '@user/domain';
+
+describe('GetUserUsecase', () => {
+  let getUserUsecase: GetUserUsecase;
+  let userRepository: jest.Mocked<UserRepository>;
+
+  beforeEach(() => {
+    userRepository = {
+      findById: jest.fn(),
+      findAll: jest.fn(),
+    } as unknown as jest.Mocked<UserRepository>;
+
+    getUserUsecase = new GetUserUsecase(userRepository);
+  });
+
+  describe('execute', () => {
+    it('should return a user when found', async () => {
+      const user = { id: '1', name: 'John Doe' };
+      userRepository.findById.mockResolvedValue(user);
+
+      const result = await getUserUsecase.execute('1');
+
+      expect(result).toEqual(user);
+      expect(userRepository.findById).toHaveBeenCalledWith('1');
+    });
+
+    it('should return null when user is not found', async () => {
+      userRepository.findById.mockResolvedValue(null);
+
+      const result = await getUserUsecase.execute('1');
+
+      expect(result).toBeNull();
+      expect(userRepository.findById).toHaveBeenCalledWith('1');
+    });
+  });
+
+  describe('executeAll', () => {
+    it('should return all users', async () => {
+      const users = [{ id: '1', name: 'John Doe' }, { id: '2', name: 'Jane Doe' }];
+      userRepository.findAll.mockResolvedValue(users);
+
+      const result = await getUserUsecase.executeAll();
+
+      expect(result).toEqual(users);
+      expect(userRepository.findAll).toHaveBeenCalled();
+    });
+  });
+});

libs/user/usecase/src/lib/get-user.usecase.ts

@@ -0,0 +1,13 @@
+import { User, UserRepository } from '@user/domain';
+
+export class GetUserUsecase {
+  constructor(private readonly userRepository: UserRepository) {}
+
+  async execute(id: string): Promise<User | null> {
+    return this.userRepository.findById(id);
+  }
+
+  async executeAll(): Promise<User[]> {
+    return this.userRepository.findAll();
+  }
+}