public CriacaoDaMatriculaTest()
        {
            _cursoRepositorio     = new Mock <ICourseRepository>();
            _alunoRepositorio     = new Mock <IStudentRepository>();
            _matriculaRepositorio = new Mock <IEnrollmentRepository>();

            _aluno = StudentBuilder.New().WithId(23).WithTargetAudience(TargetAudience.Graduate).Build();
            _alunoRepositorio.Setup(r => r.GetById(_aluno.Id)).Returns(_aluno);

            _course = CursoBuilder.Novo().ComId(45).ComPublicoAlvo(TargetAudience.Graduate).Build();
            _cursoRepositorio.Setup(r => r.GetById(_course.Id)).Returns(_course);

            _enrollmentDto = new EnrollmentDto {
                StudentId = _aluno.Id, CourseId = _course.Id, PaidAmount = _course.Amount
            };

            _enrollmentCreation = new EnrollmentCreation(_alunoRepositorio.Object, _cursoRepositorio.Object, _matriculaRepositorio.Object);
        }