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@@ -158,6 +158,44 @@ module Merb::Test::Rspec::ControllerMatchers
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     end
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   end
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+  class Provide
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+
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+    # === Parameters
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+    # Symbol:: A format to check
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+    def initialize(expected)
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+      @expected = expected
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+    end
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+    
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+    # ==== Parameters
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+    # target<Symbol>::
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+    #   A format (e.g., :html, :json, etc.)
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+    #
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+    # ==== Returns
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+    # Boolean:: True if the provided formats include the target
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+    def matches?(target)
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+      @target = target
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+      provided_formats.include?( target )
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+    end
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+
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+    # ==== Returns
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+    # String:: The failure message.
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+    def failure_message
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+      "expected #{@target.name} to provide #{@expected}, but it doesn't"
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+    end
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+
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+    # ==== Returns
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+    # String:: The failure message to be displayed in negative matches.
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+    def negative_failure_message
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+      "expected #{@target.name} not to provide #{@expected}, but it does"
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+    end
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+
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+    # ==== Returns
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+    # Array[Symbol]:: The formats the expected provides
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+    def provided_formats
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+      @expected.class_provided_formats
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+    end
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+  end
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+
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   # Passes if the target was redirected, or the target is a redirection (300
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   # level) response code.
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   #
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@@ -266,4 +304,13 @@ module Merb::Test::Rspec::ControllerMatchers
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   end
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   alias_method :be_client_error, :be_missing
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-end
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\ No newline at end of file
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+
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+  # Passes if the controller actually provides the target format
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+  #
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+  # ==== Examples
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+  #   ControllerClass.should provide( :html )
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+  #   controller_instance.should provide( :xml )
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+  def provide( expected )
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+    Provide.new( expected )
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+  end
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+end

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@@ -374,5 +374,29 @@ module Merb::Test::Rspec
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         end
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       end
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     end
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+
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+    describe Provide do
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+      class TestController < Merb::Controller
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+        provides :xml
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+      end
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+
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+      it 'should match for formats a controller class provides' do
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+        Provide.new( TestController ).matches?( :xml ).should be_true
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+      end
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+
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+      it 'should match for formats a controller instance provides' do
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+        t = TestController.new( fake_request )
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+        Provide.new( t ).matches?( :xml ).should be_true
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+      end
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+
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+      it 'should not match for formats a controller class does not provide' do
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+        Provide.new( TestController ).matches?( :yaml ).should be_false
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+      end
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+
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+      it 'should not match for formats a controller instance does not provide' do
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+        t = TestController.new( fake_request )
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+        Provide.new( t ).matches?( :yaml ).should be_false
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+      end
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+    end
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   end
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-end
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\ No newline at end of file
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+end