public void GetStudentById_ShouldReturnOneStudent()
        {
            var repository = new FakeRepository<Student>();

            var studentToAdd1 = new Student()
            {
                FirstName = "Pesho"
            };
            var studentToAdd2 = new Student()
            {
                FirstName = "Pesho"
            };
            var studentToAdd3 = new Student()
            {
                FirstName = "Pesho"
            };
            repository.entities.Add(studentToAdd1);
            repository.entities.Add(studentToAdd2);
            repository.entities.Add(studentToAdd3);

            var controller = new StudentsController(repository);

            var studentModels = controller.GetSingle(studentToAdd3.StudentId);
            Assert.IsNotNull(studentModels);
            Assert.AreEqual(studentModels.FirstName, studentToAdd3.FirstName);
        }