resolve todos in website

core/identity/application/use-cases/SignupUseCase.test.ts

@@ -0,0 +1,71 @@
+import { describe, it, expect, vi, type Mock } from 'vitest';
+import { SignupUseCase } from './SignupUseCase';
+import { EmailAddress } from '../../domain/value-objects/EmailAddress';
+import { UserId } from '../../domain/value-objects/UserId';
+import { User } from '../../domain/entities/User';
+import type { IAuthRepository } from '../../domain/repositories/IAuthRepository';
+import type { IPasswordHashingService } from '../../domain/services/PasswordHashingService';
+
+vi.mock('../../domain/value-objects/PasswordHash', () => ({
+  PasswordHash: {
+    fromHash: (hash: string) => ({ value: hash }),
+  },
+}));
+
+describe('SignupUseCase', () => {
+  let authRepo: {
+    findByEmail: Mock;
+    save: Mock;
+  };
+  let passwordService: {
+    hash: Mock;
+  };
+  let useCase: SignupUseCase;
+
+  beforeEach(() => {
+    authRepo = {
+      findByEmail: vi.fn(),
+      save: vi.fn(),
+    };
+    passwordService = {
+      hash: vi.fn(),
+    };
+
+    useCase = new SignupUseCase(
+      authRepo as unknown as IAuthRepository,
+      passwordService as unknown as IPasswordHashingService,
+    );
+  });
+
+  it('creates and saves a new user when email is free', async () => {
+    const email = 'new@example.com';
+    const password = 'password123';
+    const displayName = 'New User';
+
+    authRepo.findByEmail.mockResolvedValue(null);
+    passwordService.hash.mockResolvedValue('hashed-password');
+
+    const result = await useCase.execute(email, password, displayName);
+
+    expect(authRepo.findByEmail).toHaveBeenCalledWith(EmailAddress.create(email));
+    expect(passwordService.hash).toHaveBeenCalledWith(password);
+    expect(authRepo.save).toHaveBeenCalled();
+
+    expect(result).toBeInstanceOf(User);
+    expect(result.getDisplayName()).toBe(displayName);
+  });
+
+  it('throws when user already exists', async () => {
+    const email = 'existing@example.com';
+
+    const existingUser = User.create({
+      id: UserId.create(),
+      displayName: 'Existing User',
+      email,
+    });
+
+    authRepo.findByEmail.mockResolvedValue(existingUser);
+
+    await expect(useCase.execute(email, 'password', 'Existing User')).rejects.toThrow('User already exists');
+  });
+});