Adding option to ActiveResource to allow you to not reset the previously stored requests and responses by passing false to respond_to

activeresource/lib/active_resource/http_mock.rb

@@ -133,8 +133,44 @@ module ActiveResource
       #   pairs = {create_matz => created_response, get_matz => ok_response}
       # 
       #   ActiveResource::HttpMock.respond_to(pairs)
-      def respond_to(pairs = {}) #:yields: mock
-        reset!
+      #
+      # Note, by default, every time you call +respond_to+, any previous request and response pairs stored
+      # in HttpMock will be deleted giving you a clean slate to work on.
+      # 
+      # If you want to override this behaviour, pass in +false+ as the last argument to +respond_to+
+      # 
+      # === Example
+      # 
+      #   ActiveResource::HttpMock.respond_to do |mock|
+      #     mock.send(:get, "/people/1", {}, "XML1")
+      #   end
+      #   ActiveResource::HttpMock.responses.length #=> 1
+      #   
+      #   ActiveResource::HttpMock.respond_to(false) do |mock|
+      #     mock.send(:get, "/people/2", {}, "XML2")
+      #   end
+      #   ActiveResource::HttpMock.responses.length #=> 2
+      # 
+      # This also works with passing in generated pairs of requests and responses, again, just pass in false
+      # as the last argument:
+      # 
+      # === Example
+      # 
+      #   ActiveResource::HttpMock.respond_to do |mock|
+      #     mock.send(:get, "/people/1", {}, "XML1")
+      #   end
+      #   ActiveResource::HttpMock.responses.length #=> 1
+      # 
+      #   get_matz         = ActiveResource::Request.new(:get, '/people/1.xml', nil)
+      #   ok_response      = ActiveResource::Response.new("", 200, {})
+      # 
+      #   pairs = {get_matz => ok_response}
+      #
+      #   ActiveResource::HttpMock.respond_to(pairs, false)
+      #   ActiveResource::HttpMock.responses.length #=> 2
+      def respond_to(*args) #:yields: mock
+        pairs = args.first || {}
+        reset! if args.last.class != FalseClass
         responses.concat pairs.to_a
         if block_given?
           yield Responder.new(responses)

activeresource/test/cases/http_mock_test.rb

@@ -88,7 +88,7 @@ class HttpMockTest < ActiveSupport::TestCase
     assert_equal matz, ActiveResource::HttpMock.responses.assoc(get_matz)[1].body
   end
 
-  test "resets all mocked responses on each call to respond_to by default" do
+  test "resets all mocked responses on each call to respond_to with a block by default" do
     ActiveResource::HttpMock.respond_to do |mock|
       mock.send(:get, "/people/1", {}, "XML1")
     end
@@ -100,6 +100,46 @@ class HttpMockTest < ActiveSupport::TestCase
     assert_equal 1, ActiveResource::HttpMock.responses.length
   end
 
+  test "resets all mocked responses on each call to respond_to by passing pairs by default" do
+    ActiveResource::HttpMock.respond_to do |mock|
+      mock.send(:get, "/people/1", {}, "XML1")
+    end
+    assert_equal 1, ActiveResource::HttpMock.responses.length
+
+    matz  = { :id => 1, :name => "Matz" }.to_xml(:root => "person")
+    get_matz = ActiveResource::Request.new(:get, '/people/1.xml', nil)
+    ok_response = ActiveResource::Response.new(matz, 200, {})
+    ActiveResource::HttpMock.respond_to({get_matz => ok_response})
+
+    assert_equal 1, ActiveResource::HttpMock.responses.length
+  end
+
+  test "allows you to add new responses to the existing responses by calling a block" do
+    ActiveResource::HttpMock.respond_to do |mock|
+      mock.send(:get, "/people/1", {}, "XML1")
+    end
+    assert_equal 1, ActiveResource::HttpMock.responses.length
+
+    ActiveResource::HttpMock.respond_to(false) do |mock|
+      mock.send(:get, "/people/2", {}, "XML2")
+    end
+    assert_equal 2, ActiveResource::HttpMock.responses.length
+  end
+
+  test "allows you to add new responses to the existing responses by passing pairs" do
+    ActiveResource::HttpMock.respond_to do |mock|
+      mock.send(:get, "/people/1", {}, "XML1")
+    end
+    assert_equal 1, ActiveResource::HttpMock.responses.length
+
+    matz  = { :id => 1, :name => "Matz" }.to_xml(:root => "person")
+    get_matz = ActiveResource::Request.new(:get, '/people/1.xml', nil)
+    ok_response = ActiveResource::Response.new(matz, 200, {})
+    ActiveResource::HttpMock.respond_to({get_matz => ok_response}, false)
+
+    assert_equal 2, ActiveResource::HttpMock.responses.length
+  end
+
   def request(method, path, headers = {}, body = nil)
     if [:put, :post].include? method
       @http.send(method, path, body, headers)