Make ActiveResource::InvalidRequestError more user friendly

Signed-off-by: Xavier Noria <fxn@hashref.com>

activeresource/lib/active_resource/http_mock.rb

@@ -126,7 +126,7 @@ module ActiveResource
         #   if response = self.class.responses.assoc(request)
         #     response[1]
         #   else
-        #     raise InvalidRequestError.new("No response recorded for #{request}")
+        #     raise InvalidRequestError.new("Could not find a response recorded for #{request.to_s} - Responses recorded are: - #{inspect_responses}")
         #   end
         # end
         module_eval <<-EOE, __FILE__, __LINE__ + 1
@@ -136,7 +136,7 @@ module ActiveResource
             if response = self.class.responses.assoc(request)
               response[1]
             else
-              raise InvalidRequestError.new("No response recorded for \#{request}")
+              raise InvalidRequestError.new("Could not find a response recorded for \#{request.to_s} - Responses recorded are: \#{inspect_responses}")
             end
           end
         EOE
@@ -146,6 +146,10 @@ module ActiveResource
     def initialize(site) #:nodoc:
       @site = site
     end
+
+    def inspect_responses #:nodoc:
+      self.class.responses.map { |r| r[0].to_s }.inspect
+    end
   end
 
   class Request

activeresource/test/cases/http_mock_test.rb

@@ -59,6 +59,17 @@ class HttpMockTest < ActiveSupport::TestCase
       assert_equal "XML", request(method, "/people/1", FORMAT_HEADER[method] => "application/xml").body
       assert_equal "Json", request(method, "/people/1", FORMAT_HEADER[method] => "application/json").body
     end
+
+    test "raises InvalidRequestError if no response found for the #{method} request" do
+      ActiveResource::HttpMock.respond_to do |mock|
+        mock.send(method, "/people/1", {FORMAT_HEADER[method] => "application/xml"}, "XML")
+      end
+
+      assert_raise(::ActiveResource::InvalidRequestError) do
+        request(method, "/people/1", FORMAT_HEADER[method] => "application/json")
+      end
+    end
+    
   end
 
   def request(method, path, headers = {}, body = nil)