diff --git a/spec/lgtm_spec.rb b/spec/lgtm_spec.rb
index e7a8177..0d472bf 100644
--- a/spec/lgtm_spec.rb
+++ b/spec/lgtm_spec.rb
@@ -25,13 +25,21 @@ module Danger
         expect(@dangerfile.status_report[:markdowns].length).to eq(1)
       end
 
+      it 'lgtm with default url is OverQuota' do
+        allow(Net::HTTP).to receive(:start).and_return(mock(code: '503'))
+
+        expect(@dangerfile.status_report[:markdowns]).to be_empty
+      end
+
       def mock(request_url: 'https://lgtm.in/p/sSuI4hm0q',
-               actual_image_url: 'https://example.com/image.jpg')
+               actual_image_url: 'https://example.com/image.jpg',
+               code: '200')
         double(
           :[] => request_url,
           body: JSON.generate(
             actualImageUrl: actual_image_url
-          )
+          ),
+          code: code
         )
       end