Create file with exceptions for elements

shopelectro/selenium/elements/__init__.py

@@ -1,3 +1,4 @@
-from .input import Input
 from .button import Button
+from .exceptions import Unavailable
+from .input import Input
 from .product import CatalogProduct, CartPosition

shopelectro/selenium/elements/cart.py

@@ -1,14 +1,22 @@
+from shopelectro.selenium.elements import Unavailable
+
+# @todo #799:120m Reuse shopelectro.selenium.elements.cart.Cart for selenium tests.
+
+
 class Cart:
     """"Represent the cart at the site."""
 
     def __init__(self, driver: SiteDriver):
         self.driver = driver
 
-	def positions(self):
-		pass
+    def positions(self):
+        raise Unavailable('to get positions.')
+
+    def clear(self):
+        raise Unavailable('to get positions.')
 
-	def clear(self):
-		pass
+    def total(self):
+        raise Unavailable('to get positions.')
 
-	def total(self):
-		pass
+    def is_empty(self):
+        raise Unavailable('to get positions.')

shopelectro/selenium/elements/exceptions.py

@@ -0,0 +1,4 @@
+class Unavailable(NotImplementedError):
+
+    def __init__(self, msg, *args, **kwargs):
+        super().__init__(f'The element doesn\'t provide ability to {msg}', *args, **kwargs)

shopelectro/selenium/elements/product.py

@@ -1,18 +1,12 @@
 import abc
 
-from shopelectro.selenium.elements import Button
+from shopelectro.selenium.elements import Button, Unavailable
 from shopelectro.selenium.driver import SiteDriver
 
 from selenium.webdriver.common.by import By
 from selenium.webdriver.support import expected_conditions as EC
 
 
-class Unavailable(NotImplementedError):
-
-    def __init__(self, msg, *args, **kwargs):
-        super().__init__(f'The element doesn\'t provide ability to {msg}', *args, **kwargs)
-
-
 class Product(abc.ABC):
     """"Represent a product at the site."""
 

shopelectro/tests/tests_selenium.py

@@ -21,9 +21,6 @@
 from pages.models import FlatPage, CustomPage
 from pages.urls import reverse_custom_page
 
-# @todo #783:60m Create Cart class for tests.
-#  The class should replace batch of methods from this file.
-
 
 def add_to_cart(browser):
     browser.get(Product.objects.first().url)