def test_add_to_cart(self):
        # self.api_client.client.login(username=self.username, password=self.password)

        # get categories
        response = self.api_client.get(
            '/api/v1/category/',
            # authentication=self.get_credentials()
        )
        categories = self.deserialize(response)

        # get single category
        category = categories['objects'][0]

        # get products list from category
        response = self.api_client.get(
            '/api/v1/product/?category={}'.format(category['id']),
            # authentication=self.get_credentials()
        )
        products = self.deserialize(response)
        product = products['objects'][0]

        # get cart
        response = self.api_client.get(
            '/api/v1/cart/{}/'.format(self.user.cart.id),
            # authentication=self.get_credentials()
        )
        cart = self.deserialize(response)

        # insert product to cart (create cart item)
        response = self.api_client.post(
            '/api/v1/cart_item/1/',
            data=dict(
                cart=cart,
                product=product,
                amount=1,
            ),
            # authentication=self.get_credentials()
        )

        print response
        print response.status_code