public async Task Add_WhenAddRental_ShouldSaveTheRental() { var clientId = 1; var vehicleId = 1; _dbContext.Vehicles.Add(new Vehicle { Description = "Ford Focus", PricePerDay = 10 }); _dbContext.SaveChanges(); var rental = new RentalDto { ClientId = clientId, VehicleId = vehicleId, StartDate = new DateTime(2021, 4, 1), EndDate = new DateTime(2021, 4, 10) }; await _sut.AddNewRental(rental); _dbContext.Rentals.Count().Should().Be(1); var rentalAdded = await _dbContext.Rentals.FirstOrDefaultAsync(); rentalAdded.Id.Should().Be(1); rentalAdded.ClientId.Should().Be(clientId); rentalAdded.VehicleId.Should().Be(vehicleId); rentalAdded.StartDate.Should().Be(new DateTime(2021, 4, 1)); rentalAdded.EndDate.Should().Be(new DateTime(2021, 4, 10)); rentalAdded.Price.Should().Be(90); rentalAdded.Canceled.Should().BeFalse(); }