Rate#for should handle invalid users. #1920

spec/models/rate_spec.rb

@@ -190,6 +190,12 @@ describe Rate, 'for' do
       Rate.for(@user).should eql(@rate.amount)
     end
   end
+  
+  it 'with an invalid user should be nil' do
+    object = mock('random_object_with_id_attribute')
+    Rate.should_not_receive(:for_user_project_and_date)
+    Rate.for(object).should be_nil
+  end
 end
 
 describe Rate, 'for_user_project_and_date (private)' do