Fix: test must track encoding comment not the whole file

Author: Artūrs Mekšs

spec/annotate/annotate_models_spec.rb

@@ -407,7 +407,7 @@ class User < ActiveRecord::Base
 
         annotate_one_file :position => :before
 
-        File.read(@model_file_name).should == "#{encoding_comment}\n#{@schema_info}#{@file_content}"
+        File.open(@model_file_name, &:readline).should == "#{encoding_comment}\n"
       end
     end