Remove useless MockModel class

spec/paperclip/url_generator_spec.rb

@@ -43,7 +43,7 @@ describe Paperclip::UrlGenerator do
   end
   end
 
 
   it "executes the method named by the symbol as the default URL when no file is assigned" do
   it "executes the method named by the symbol as the default URL when no file is assigned" do
-    mock_model = MockModel.new
+    mock_model = FakeModel.new
     mock_attachment = MockAttachment.new(model: mock_model)
     mock_attachment = MockAttachment.new(model: mock_model)
     mock_interpolator = MockInterpolator.new
     mock_interpolator = MockInterpolator.new
     default_url = :to_s
     default_url = :to_s

spec/support/mock_model.rb

-class MockModel
-end