old_contents: import unittest
  
  from mtglib.constants import base_url, card_flags
  
  class DescribeConstants(unittest.TestCase):
  
      def should_have_base_url(self):
          url = ('http://gatherer.wizards.com/Pages/Search/Default.aspx'
                 '?output=standard&')
          assert base_url == url
  
      def should_have_card_flags(self):
          assert card_flags == ['text', 'color', 'subtype', 'type', 'set', 'cmc',
                                'power', 'tough', 'rarity', 'name', 'block']
new_contents: import unittest
  
  from mtglib.constants import base_url, card_flags
  
  class DescribeConstants(unittest.TestCase):
  
      def should_have_base_url(self):
          url = ('http://gatherer.wizards.com/Pages/Search/Default.aspx'
                 '?output=standard&action=advanced&')
          assert base_url == url
  
      def should_have_card_flags(self):
          assert card_flags == ['text', 'color', 'subtype', 'type', 'set', 'cmc',
                                'power', 'tough', 'rarity', 'name', 'block']
subject: Update base url in tests.