public void Doctor_DeletePatients_DeletesAllOfDoctorsPatients()
        {
            Doctor doctor = new Doctor("Tom", "tom567", "567", "Cardiology");

            doctor.Save();
            Patient patient1 = new Patient("John", "john123", "123", new DateTime(1996, 04, 25));

            patient1.Save();
            Patient patient2 = new Patient("Tom", "john123", "123", new DateTime(1996, 04, 25));

            patient2.Save();


            doctor.AddPatient(patient1);
            doctor.AddPatient(patient2);
            doctor.DeletePatients();

            List <Patient> testList    = doctor.GetPatients();
            List <Patient> controlList = new List <Patient> {
            };

            Assert.Equal(controlList, testList);
        }