public async Task EditAsync_ShouldWorkCorrectly()
        {
            // Arrange
            var context = ApplicationDbContextInMemoryFactory.InitializeContext();
            var seeder  = new FlightsServiceTestsSeeder();
            await seeder.SeedFlightAsync(context);

            var flightRepository = new EfDeletableEntityRepository <Flight>(context);

            var service = new FlightsService(flightRepository);
            var flight  = flightRepository.All().First();
            var model   = new FlightViewModel
            {
                Id                = flight.Id,
                FlightNumber      = flight.FlightNumber,
                AvailableSeats    = flight.AvailableSeats,
                PricePerPerson    = flight.PricePerPerson,
                ReservationType   = flight.ReservationType,
                StartPointId      = flight.StartPointId,
                StartPointAirPort = flight.StartPointAirPort,
                EndPointId        = flight.EndPointId,
                EndPointAirPort   = flight.EndPointAirPort,
                DepartureDateTime = flight.DepartureDateTime,
                FlightTime        = flight.FlightTime,
                CompanyId         = flight.CompanyId,
            };

            model.FlightNumber      = "EditedFlightNumber";
            model.AvailableSeats    = 20;
            model.PricePerPerson    = 50;
            model.ReservationType   = ReservationType.Flight;
            model.StartPointId      = 1;
            model.StartPointAirPort = "EditedStartAirPort";
            model.EndPointId        = 2;
            model.EndPointAirPort   = "EditedEndAirPort";
            model.DepartureDateTime = new DateTime(2020, 03, 03, 13, 00, 00);
            model.FlightTime        = new TimeSpan(30, 30, 00);
            model.CompanyId         = 1;

            // Act
            await service.EditAsync(model.Id, model);

            var actualResult   = flightRepository.All().First();
            var expectedResult = model;

            // Assert
            Assert.True(expectedResult.FlightNumber == actualResult.FlightNumber);
            Assert.True(expectedResult.AvailableSeats == actualResult.AvailableSeats);
            Assert.True(expectedResult.PricePerPerson == actualResult.PricePerPerson);
            Assert.True(expectedResult.ReservationType == actualResult.ReservationType);
            Assert.True(expectedResult.StartPointId == actualResult.StartPointId);
            Assert.True(expectedResult.StartPointAirPort == actualResult.StartPointAirPort);
            Assert.True(expectedResult.EndPointId == actualResult.EndPointId);
            Assert.True(expectedResult.EndPointAirPort == actualResult.EndPointAirPort);
            Assert.True(expectedResult.DepartureDateTime == actualResult.DepartureDateTime);
            Assert.True(expectedResult.FlightTime == actualResult.FlightTime);
            Assert.True(expectedResult.CompanyId == actualResult.CompanyId);
        }