public void GetAllVehiclesModels_ShouldReturnAllVehiclesModels()
        {
            var vehiclesModels = new List <VehicleModel>
            {
                new VehicleModel {
                    Id = 1
                },
                new VehicleModel {
                    Id = 2
                },
                new VehicleModel {
                    Id = 3
                }
            };
            var mockContext = new Mock <InstantDeliveryContext>();

            mockContext.Setup(c => c.VehicleModels).ReturnsDbSet(vehiclesModels);
            var controller = new VehiclesController(mockContext.Object);

            var result = controller.GetModels() as OkNegotiatedContentResult <List <VehicleModel> >;
            var count  = result?.Content.Count;

            Assert.Equal(count, 3);
        }