user/src/modules/users/tests/unit/find-all-users.usecase.spec.ts

import { Test, TestingModule } from '@nestjs/testing';
import { UsersRepository } from '../../adapters/secondaries/users.repository';
import { FindAllUsersUseCase } from '../../domain/usecases/find-all-users.usecase';
import { FindAllUsersQuery } from '../../queries/find-all-users.query';

const mockUsers = [
  {
    uuid: 'bb281075-1b98-4456-89d6-c643d3044a91',
    firstName: 'John',
    lastName: 'Doe',
    email: 'john.doe@email.com',
  },
  {
    uuid: 'bb281075-1b98-4456-89d6-c643d3044a92',
    firstName: 'Jane',
    lastName: 'Doe',
    email: 'jane.doe@email.com',
  },
  {
    uuid: 'bb281075-1b98-4456-89d6-c643d3044a93',
    firstName: 'Jimmy',
    lastName: 'Doe',
    email: 'jimmy.doe@email.com',
  },
];

const mockUsersRepository = {
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  findAll: jest.fn().mockImplementation((query?: FindAllUsersQuery) => {
    return Promise.resolve(mockUsers);
  }),
};

describe('FindAllUsersUseCase', () => {
  let findAllUsersUseCase: FindAllUsersUseCase;

  beforeAll(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        {
          provide: UsersRepository,
          useValue: mockUsersRepository,
        },
        FindAllUsersUseCase,
      ],
    }).compile();

    findAllUsersUseCase = module.get<FindAllUsersUseCase>(FindAllUsersUseCase);
  });

  it('should be defined', () => {
    expect(findAllUsersUseCase).toBeDefined();
  });

  describe('execute', () => {
    it('should return an array filled with users', async () => {
      const users = await findAllUsersUseCase.execute(new FindAllUsersQuery());

      expect(users).toBe(mockUsers);
    });
  });
});