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@@ -256,7 +256,7 @@
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     #---
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     # @public
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     def only_provides(*formats)
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-      self._provided_formats = *formats
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+      _set_provided_formats(*formats)
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     end
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     # Removes formats from the list of provided formats for this particular 

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@@ -15,25 +15,37 @@
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   class HtmlDefault < Responder; end
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-  class ClassProvides < Responder; 
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+  class ClassProvides < Responder
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     provides :xml
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   end
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-  class LocalProvides < Responder; 
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-    
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+  class LocalProvides < Responder
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     def index
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       provides :xml
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       render
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     end
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   end
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-  class MultiProvides < Responder; 
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-    
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+  class MultiProvides < Responder
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     def index
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       provides :html, :js
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       render
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     end
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   end
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-
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+  
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+  class ClassOnlyProvides < Responder
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+    only_provides :text, :xml
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+    
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+    def index
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+      "nothing"
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+    end
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+  end
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+  
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+  class OnlyProvides < Responder
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+    def index
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+      only_provides :text, :xml
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+      "nothing"
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+    end
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+  end
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 end

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@@ -62,5 +62,25 @@
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     controller = dispatch_to(Merb::Test::Fixtures::Controllers::LocalProvides, :index, :format => "xml")
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     controller.content_type.should == :xml    
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   end
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+  
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+  it "should properly add formats when only_provides is called in action" do
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+    controller = dispatch_to(Merb::Test::Fixtures::Controllers::OnlyProvides, :index, {}, :http_accept => "application/xml")
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+    controller.content_type.should == :xml
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+  end
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+
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+  it "should properly remove formats when only_provides is called in action" do
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+    controller = dispatch_to(Merb::Test::Fixtures::Controllers::OnlyProvides, :index, {}, :http_accept => "application/html")
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+    lambda { controller.content_type }.should raise_error(Merb::ControllerExceptions::NotAcceptable)
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+  end
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+
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+  it "should properly add formats when only_provides is called in controller" do
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+    controller = dispatch_to(Merb::Test::Fixtures::Controllers::ClassOnlyProvides, :index, {}, :http_accept => "application/xml")
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+    controller.content_type.should == :xml
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+  end
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+
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+  it "should properly remove formats when only_provides is called in controller" do
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+    controller = dispatch_to(Merb::Test::Fixtures::Controllers::ClassOnlyProvides, :index, {}, :http_accept => "application/html")
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+    lambda { controller.content_type }.should raise_error(Merb::ControllerExceptions::NotAcceptable)
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+  end
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 end