public void ChangeTicketStateToClosed_ChangeOpenStateToClosed_StateHasChanged()
{
//Arrange
TicketManager ticketManager = new TicketManager(ticketRepository);
//Act
ticketManager.AddTicket(1, "Unit test");
ticketManager.ChangeTicketStateToClosed(1);
var result = ticketManager.GetTicket(1);
//Assert
Assert.AreEqual(result.State, TicketState.Closed);
}