agentic-dev/packages/auth/src/application/use-cases/sign-up.use-case.test.ts

import { beforeEach, describe, expect, it } from "vitest";
import { authContainer } from "@/di/container";
import { AUTH_SYMBOLS } from "@/di/symbols";
import { MockUsersRepository } from "@/infrastructure/repositories/mock-users.repository";
import { MockAuthenticationService } from "@/infrastructure/services/mock-authentication.service";
import type { IUsersRepository } from "@/application/repositories/users-repository.interface";
import type { IAuthenticationService } from "@/application/services/authentication-service.interface";
import { AuthenticationError } from "@/entities/errors/auth";
import { signUpUseCase } from "./sign-up.use-case";

describe("signUpUseCase", () => {
  let usersRepo: MockUsersRepository;
  let authService: MockAuthenticationService;

  beforeEach(() => {
    if (authContainer.isBound(AUTH_SYMBOLS.IUsersRepository)) {
      authContainer.unbind(AUTH_SYMBOLS.IUsersRepository);
    }
    if (authContainer.isBound(AUTH_SYMBOLS.IAuthenticationService)) {
      authContainer.unbind(AUTH_SYMBOLS.IAuthenticationService);
    }
    usersRepo = new MockUsersRepository();
    authService = new MockAuthenticationService(usersRepo);
    authContainer
      .bind<IUsersRepository>(AUTH_SYMBOLS.IUsersRepository)
      .toConstantValue(usersRepo);
    authContainer
      .bind<IAuthenticationService>(AUTH_SYMBOLS.IAuthenticationService)
      .toConstantValue(authService);
  });

  it("creates a new user and returns session + cookie + user", async () => {
    const result = await signUpUseCase({
      username: "carol",
      password: "secret_password",
    });
    expect(result.user.username).toBe("carol");
    expect(result.session.userId).toBe(result.user.id);
    expect(result.cookie.name).toBe("session");
  });

  it("throws AuthenticationError when username taken", async () => {
    await expect(
      signUpUseCase({ username: "alice", password: "secret_password" }),
    ).rejects.toBeInstanceOf(AuthenticationError);
  });
});