Upgraded to Rails 2.1. This can have wide ranging consequences, so please help track down any issues introduced by the upgrade. Requires environment.rb modifications.

Changes you will need to make:

 * In your environment.rb, you will need to update references to a few files per environment.rb.tmpl
 * In your environment.rb, you will need to specify the local time zone of the computer that is running your Tracks install.

Other notes on my changes:

 * Modified our code to take advantage of Rails 2.1's slick time zone support.
 * Upgraded will_paginate for compatibility
 * Hacked the Selenium on Rails plugin, which has not been updated in some time and does not support Rails 2.1
 * Verified that all tests pass on my machine, including Selenium tests -- I'd like confirmation from others, too.

vendor/rails/activeresource/lib/active_resource/http_mock.rb

@@ -3,14 +3,58 @@ require 'active_resource/connection'
 module ActiveResource
   class InvalidRequestError < StandardError; end #:nodoc:
 
+  # One thing that has always been a pain with remote web services is testing.  The HttpMock
+  # class makes it easy to test your Active Resource models by creating a set of mock responses to specific
+  # requests.
+  #
+  # To test your Active Resource model, you simply call the ActiveResource::HttpMock.respond_to
+  # method with an attached block.  The block declares a set of URIs with expected input, and the output
+  # each request should return.  The passed in block has any number of entries in the following generalized
+  # format:
+  #
+  #   mock.http_method(path, request_headers = {}, body = nil, status = 200, response_headers = {})
+  #
+  # * <tt>http_method</tt> - The HTTP method to listen for.  This can be +get+, +post+, +put+, +delete+ or
+  #   +head+.
+  # * <tt>path</tt> - A string, starting with a "/", defining the URI that is expected to be
+  #   called.
+  # * <tt>request_headers</tt> - Headers that are expected along with the request.  This argument uses a
+  #   hash format, such as <tt>{ "Content-Type" => "application/xml" }</tt>.  This mock will only trigger
+  #   if your tests sends a request with identical headers.
+  # * <tt>body</tt> - The data to be returned.  This should be a string of Active Resource parseable content,
+  #   such as XML.
+  # * <tt>status</tt> - The HTTP response code, as an integer, to return with the response.
+  # * <tt>response_headers</tt> - Headers to be returned with the response.  Uses the same hash format as
+  #   <tt>request_headers</tt> listed above.
+  #
+  # In order for a mock to deliver its content, the incoming request must match by the <tt>http_method</tt>,
+  # +path+ and <tt>request_headers</tt>.  If no match is found an InvalidRequestError exception
+  # will be raised letting you know you need to create a new mock for that request.
+  #
+  # ==== Example
+  #   def setup
+  #     @matz  = { :id => 1, :name => "Matz" }.to_xml(:root => "person")
+  #     ActiveResource::HttpMock.respond_to do |mock|
+  #       mock.post   "/people.xml",   {}, @matz, 201, "Location" => "/people/1.xml"
+  #       mock.get    "/people/1.xml", {}, @matz
+  #       mock.put    "/people/1.xml", {}, nil, 204
+  #       mock.delete "/people/1.xml", {}, nil, 200
+  #     end
+  #   end
+  #   
+  #   def test_get_matz
+  #     person = Person.find(1)
+  #     assert_equal "Matz", person.name
+  #   end
+  #
   class HttpMock
-    class Responder
+    class Responder #:nodoc:
       def initialize(responses)
         @responses = responses
       end
 
-      for method in [ :post, :put, :get, :delete ]
-        module_eval <<-EOE
+      for method in [ :post, :put, :get, :delete, :head ]
+        module_eval <<-EOE, __FILE__, __LINE__
           def #{method}(path, request_headers = {}, body = nil, status = 200, response_headers = {})
             @responses[Request.new(:#{method}, path, nil, request_headers)] = Response.new(body || "", status, response_headers)
           end
@@ -19,15 +63,41 @@ module ActiveResource
     end
 
     class << self
+
+      # Returns an array of all request objects that have been sent to the mock.  You can use this to check
+      # wether or not your model actually sent an HTTP request.
+      #
+      # ==== Example
+      #   def setup
+      #     @matz  = { :id => 1, :name => "Matz" }.to_xml(:root => "person")
+      #     ActiveResource::HttpMock.respond_to do |mock|
+      #       mock.get "/people/1.xml", {}, @matz
+      #     end
+      #   end
+      #   
+      #   def test_should_request_remote_service
+      #     person = Person.find(1)  # Call the remote service
+      #     
+      #     # This request object has the same HTTP method and path as declared by the mock
+      #     expected_request = ActiveResource::Request.new(:get, "/people/1.xml")
+      #     
+      #     # Assert that the mock received, and responded to, the expected request from the model
+      #     assert ActiveResource::HttpMock.requests.include?(expected_request)
+      #   end
       def requests
         @@requests ||= []
       end
 
+      # Returns a hash of <tt>request => response</tt> pairs for all all responses this mock has delivered, where +request+
+      # is an instance of ActiveResource::Request and the response is, naturally, an instance of
+      # ActiveResource::Response.
       def responses
         @@responses ||= {}
       end
 
-      def respond_to(pairs = {})
+      # Accepts a block which declares a set of requests and responses for the HttpMock to respond to. See the main
+      # ActiveResource::HttpMock description for a more detailed explanation.
+      def respond_to(pairs = {}) #:yields: mock
         reset!
         pairs.each do |(path, response)|
           responses[path] = response
@@ -40,6 +110,7 @@ module ActiveResource
         end
       end
 
+      # Deletes all logged requests and responses.
       def reset!
         requests.clear
         responses.clear
@@ -47,26 +118,26 @@ module ActiveResource
     end
 
     for method in [ :post, :put ]
-      module_eval <<-EOE
+      module_eval <<-EOE, __FILE__, __LINE__
         def #{method}(path, body, headers)
           request = ActiveResource::Request.new(:#{method}, path, body, headers)
           self.class.requests << request
-          self.class.responses[request] || raise(InvalidRequestError.new("No response recorded for: \#{request.inspect}"))
+          self.class.responses[request] || raise(InvalidRequestError.new("No response recorded for \#{request}"))
         end
       EOE
     end
 
-    for method in [ :get, :delete ]
-      module_eval <<-EOE
+    for method in [ :get, :delete, :head ]
+      module_eval <<-EOE, __FILE__, __LINE__
         def #{method}(path, headers)
           request = ActiveResource::Request.new(:#{method}, path, nil, headers)
           self.class.requests << request
-          self.class.responses[request] || raise(InvalidRequestError.new("No response recorded for: \#{request.inspect}"))
+          self.class.responses[request] || raise(InvalidRequestError.new("No response recorded for \#{request}"))
         end
       EOE
     end
 
-    def initialize(site)
+    def initialize(site) #:nodoc:
       @site = site
     end
   end
@@ -75,8 +146,7 @@ module ActiveResource
     attr_accessor :path, :method, :body, :headers
 
     def initialize(method, path, body = nil, headers = {})
-      @method, @path, @body, @headers = method, path, body, headers.dup
-      @headers.update('Content-Type' => 'application/xml')
+      @method, @path, @body, @headers = method, path, body, headers.reverse_merge('Content-Type' => 'application/xml')
     end
 
     def ==(other_request)