public void GetBodyTypeIdsByModelIdAndMakeId_ShouldReturnNeededItems_WhenModelIdIsNull()
        {
            int id    = 2;
            var items = new List <Vehicle>()
            {
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = 1
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = 2
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = 2
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = null
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = null
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = null, BodyTypeId = 2, Id = 1
                },
                new Vehicle()
                {
                    MakeId = id, ModelId = 10, BodyTypeId = id, Id = 2
                },
                new Vehicle()
                {
                    MakeId = 3, ModelId = id, BodyTypeId = id
                },
            }.AsQueryable();

            var repositoryMock = new Mock <IInternalDbRepository <Vehicle> >();

            repositoryMock.Setup(x => x.All()).Returns(() => items);

            var service = new VehiclesService(repositoryMock.Object);

            var response = service.GetBodyTypeIdsByModelIdAndMakeId(id, null);

            Assert.AreEqual(response.Count, 3);
            Assert.AreEqual(response[0], 1);
            Assert.AreEqual(response[1], 2);
            Assert.AreEqual(response[2], null);
            repositoryMock.VerifyAll();
        }