public void PutGuestTest() { Guest guest = new Guest(); guest.Id = Guid.Parse("BA3279A7-AB43-41EC-9867-6F7B7E646C0E"); guest.Name = "Edith"; guest.Surname = "Hanson"; _GuestController.PutGuest(guest); var GuestAfter = _context.Guest.Find(guest.Id); Assert.IsNotNull(GuestAfter, "The method returned null."); Assert.AreEqual(guest.Name, GuestAfter.Name, "Guest name is not equal to GuestsAfter name."); Assert.AreEqual(guest.Surname, GuestAfter.Surname, "Guest Surname and GuestAfter Surname are not equel."); }