public void Delete_DeleteItem_ItemRemoved()
{
// arrange
InMemoryWarehouseRepository inmemorywarehouserepository = new InMemoryWarehouseRepository();
inmemorywarehouserepository.Add(new Warehouse(1, 10, 10));
// act
inmemorywarehouserepository.Delete(new Warehouse(1, 10, 10));
// assert
Assert.IsNull(inmemorywarehouserepository.GetById(1));
}