Add doctest for mvc

Author: Alan Tan

patterns/structural/mvc.py

@@ -110,31 +110,38 @@ def show_item_information(self, item_name):
             self.view.show_item_information(item_type, item_name, item_info)
 
 
-if __name__ == "__main__":
-
-    model = ProductModel()
-    view = ConsoleView()
-    controller = Controller(model, view)
-    controller.show_items()
-    controller.show_item_information("cheese")
-    controller.show_item_information("eggs")
-    controller.show_item_information("milk")
-    controller.show_item_information("arepas")
-
-
-### OUTPUT ###
-# PRODUCT LIST:
-# cheese
-# eggs
-# milk
-#
-# PRODUCT INFORMATION:
-# Name: Cheese, Price: 2.00, Quantity: 10
-#
-# PRODUCT INFORMATION:
-# Name: Eggs, Price: 0.20, Quantity: 100
-#
-# PRODUCT INFORMATION:
-# Name: Milk, Price: 1.50, Quantity: 10
-#
-# That product "arepas" does not exist in the records
+def main():
+    """
+    >>> model = ProductModel()
+    >>> view = ConsoleView()
+    >>> controller = Controller(model, view)
+
+    >>> controller.show_items()
+    PRODUCT LIST:
+    milk
+    eggs
+    cheese
+    <BLANKLINE>
+
+    >>> controller.show_item_information("cheese")
+    PRODUCT INFORMATION:
+    Name: cheese, Price: 2.00, Quantity: 10
+    <BLANKLINE>
+
+    >>> controller.show_item_information("eggs")
+    PRODUCT INFORMATION:
+    Name: eggs, Price: 0.20, Quantity: 100
+    <BLANKLINE>
+
+    >>> controller.show_item_information("milk")
+    PRODUCT INFORMATION:
+    Name: milk, Price: 1.50, Quantity: 10
+    <BLANKLINE>
+
+    >>> controller.show_item_information("arepas")
+    That product "arepas" does not exist in the records
+    """
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()