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/actionpack/test/controller/url_rewriter_test.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/../abstract_unit'
+require 'abstract_unit'
 
 ActionController::UrlRewriter
 
@@ -149,27 +149,91 @@ class UrlWriterTests < Test::Unit::TestCase
     )
   end
 
-  def test_named_route
+  def test_trailing_slash
+    add_host!
+    options = {:controller => 'foo', :trailing_slash => true, :action => 'bar', :id => '33'}
+    assert_equal('http://www.basecamphq.com/foo/bar/33/', W.new.url_for(options) )
+  end
+
+  def test_trailing_slash_with_protocol
+    add_host!
+    options = { :trailing_slash => true,:protocol => 'https', :controller => 'foo', :action => 'bar', :id => '33'}
+    assert_equal('https://www.basecamphq.com/foo/bar/33/', W.new.url_for(options) )
+    assert_equal 'https://www.basecamphq.com/foo/bar/33/?query=string', W.new.url_for(options.merge({:query => 'string'}))
+  end
+
+  def test_trailing_slash_with_only_path
+    options = {:controller => 'foo', :trailing_slash => true}
+    assert_equal '/foo/', W.new.url_for(options.merge({:only_path => true}))
+    options.update({:action => 'bar', :id => '33'})
+    assert_equal '/foo/bar/33/', W.new.url_for(options.merge({:only_path => true}))
+    assert_equal '/foo/bar/33/?query=string', W.new.url_for(options.merge({:query => 'string',:only_path => true}))
+  end
+
+  def test_trailing_slash_with_anchor
+    options = {:trailing_slash => true, :controller => 'foo', :action => 'bar', :id => '33', :only_path => true, :anchor=> 'chapter7'}
+    assert_equal '/foo/bar/33/#chapter7', W.new.url_for(options)
+    assert_equal '/foo/bar/33/?query=string#chapter7', W.new.url_for(options.merge({:query => 'string'}))
+  end
+
+  def test_trailing_slash_with_params
+    url = W.new.url_for(:trailing_slash => true, :only_path => true, :controller => 'cont', :action => 'act', :p1 => 'cafe', :p2 => 'link')
+    params = extract_params(url)
+    assert_equal params[0], { :p1 => 'cafe' }.to_query
+    assert_equal params[1], { :p2 => 'link' }.to_query
+  end
+
+  def test_relative_url_root_is_respected
+    orig_relative_url_root = ActionController::AbstractRequest.relative_url_root
+    ActionController::AbstractRequest.relative_url_root = '/subdir'
+
+    add_host!
+    assert_equal('https://www.basecamphq.com/subdir/c/a/i',
+      W.new.url_for(:controller => 'c', :action => 'a', :id => 'i', :protocol => 'https')
+    )
+  ensure
+    ActionController::AbstractRequest.relative_url_root = orig_relative_url_root
+  end
+
+  def test_named_routes
     ActionController::Routing::Routes.draw do |map|
       map.no_args '/this/is/verbose', :controller => 'home', :action => 'index'
       map.home '/home/sweet/home/:user', :controller => 'home', :action => 'index'
       map.connect ':controller/:action/:id'
     end
-    
+
     # We need to create a new class in order to install the new named route.
     kls = Class.new { include ActionController::UrlWriter }
     controller = kls.new
     assert controller.respond_to?(:home_url)
     assert_equal 'http://www.basecamphq.com/home/sweet/home/again',
       controller.send(:home_url, :host => 'www.basecamphq.com', :user => 'again')
-      
+
     assert_equal("/home/sweet/home/alabama", controller.send(:home_path, :user => 'alabama', :host => 'unused'))
     assert_equal("http://www.basecamphq.com/home/sweet/home/alabama", controller.send(:home_url, :user => 'alabama', :host => 'www.basecamphq.com'))
     assert_equal("http://www.basecamphq.com/this/is/verbose", controller.send(:no_args_url, :host=>'www.basecamphq.com'))
   ensure
     ActionController::Routing::Routes.load!
   end
-  
+
+  def test_relative_url_root_is_respected_for_named_routes
+    orig_relative_url_root = ActionController::AbstractRequest.relative_url_root
+    ActionController::AbstractRequest.relative_url_root = '/subdir'
+
+    ActionController::Routing::Routes.draw do |map|
+      map.home '/home/sweet/home/:user', :controller => 'home', :action => 'index'
+    end
+
+    kls = Class.new { include ActionController::UrlWriter }
+    controller = kls.new
+
+    assert_equal 'http://www.basecamphq.com/subdir/home/sweet/home/again',
+      controller.send(:home_url, :host => 'www.basecamphq.com', :user => 'again')
+  ensure
+    ActionController::Routing::Routes.load!
+    ActionController::AbstractRequest.relative_url_root = orig_relative_url_root
+  end
+
   def test_only_path
     ActionController::Routing::Routes.draw do |map|
       map.home '/home/sweet/home/:user', :controller => 'home', :action => 'index'