Rails3 not reloading code in lib while in development mode

THE SITUATION:

1. I have code in lib/foo/bar.rb with a simple method defined as such:

   module Foo
     class Bar
       def test
         "FooBar"
       end
     end
   end
   

2. In my helper, FooBarHelper, I have:

   require `lib/foo/bar`
   module FooBarHelper
     def test_foo_bar
       fb = Foo::Bar.new
       fb.test
     end
   end
   

3. In my view, I call this helper method like so:

   <%= test_foo_bar =>
   

4. In my config/environments/development.rb, I added the directory to my config.autoload_paths:

   config.autoload_paths += ["#{config.root}/lib/foo"]
   

THE PROBLEM:

When I change the return value of Foo::Bar.test to, for example, "MODIFIED FOOBAR", the original return value, "FooBar", is still being displayed on the view and not the new value.

Since I'm in development mode, shouldn't the code reload the code on every request?

Could someone tell me what I'm missing?

Thanks!