def METHOD_NAME(self):
    asin = '144930544X'
    response = self.mws.get_product_categories_for_asin(
        MarketplaceId=self.marketplace_id,
        ASIN=asin)
    self.assertEqual(len(response._result.Self), 3)
    categoryids = [x.ProductCategoryId for x in response._result.Self]
    self.assertSequenceEqual(categoryids, ['285856', '21', '491314'])