public async Task UpdateStudent_Success() { var student = _universityDbContext.Students.Add(new Student() { FirstName = "Name", LastName = "Original" }); _universityDbContext.SaveChanges(); var x = await _studentRepository.ChangeLastName(student.Id, "New"); var updatedStudent = _universityDbContext.Students.AsNoTracking().FirstOrDefault(s => s.Id.Equals(student.Id)); Assert.IsNotNull(updatedStudent); Assert.AreEqual("New", updatedStudent.LastName); }