fix spec to cover this case

Author: Michael Chen

elasticsearch-model/spec/elasticsearch/model/module_spec.rb

@@ -42,12 +42,15 @@
     before(:all) do
       class ::DummyIncludingModel; end
       class ::DummyIncludingModelWithSearchMethodDefined
+
+
         def self.search(query, options={})
           "SEARCH"
         end
       end
 
       DummyIncludingModel.__send__ :include, Elasticsearch::Model
+      DummyIncludingModelWithSearchMethodDefined.__send__ :include, Elasticsearch::Model
     end
 
     after(:all) do