Cleanup of "cross method" test on the Bulldog, by removing the unfinished test and also Bulldog.growl method, which becomes obsolete.

koans/about_inheritance.rb

@@ -60,10 +60,6 @@ class AboutInheritance < EdgeCase::Koan
     def bark
       super + ", GROWL"
     end
-
-    def growl
-      super.bark + ", GROWL"
-    end
   end
 
   def test_subclasses_can_invoke_parent_behavior_via_super
@@ -71,11 +67,6 @@ class AboutInheritance < EdgeCase::Koan
     assert_equal __, ralph.bark
   end
 
-  def test_super_does_not_work_cross_method
-    ralph = BullDog.new("Ralph")
-    
-  end
-
   # ------------------------------------------------------------------
 
   class GreatDane < Dog