public void Add_WhenAddingNullObject_ThrowArgumentNullException()
        {
            var storage = new InMemoryEntityStorage<TestEntity>() as IEntityStorage<TestEntity>;

            storage.Add(null);
        }
        public void Add_WhenAddingNullObject_ThrowArgumentNullException()
        {
            var storage = new InMemoryEntityStorage <TestEntity>() as IEntityStorage <TestEntity>;

            storage.Add(null);
        }