public void Test_Update_UpdatesClientsInDatabase()
{
//Arrange
string appointmentDay = "Monday";
Client testClient = new Client("Susie", 1, appointmentDay, "11:30");
testClient.Save();
string newAppointmentDay = "Tuesday";
//Act
testClient.Update(newAppointmentDay, "11:30");
string result = testClient.GetAppointmentDay();
//Assert
Assert.Equal(newAppointmentDay, result);
}