Is this error caused by the test-unit gem?

On Tue, Jun 8, 2010 at 9:57 PM, Sam Ruby <rubys / intertwingly.net> wrote:
> I run a series of tests on Ruby on Rails against a number of different
> vesions of Ruby:
>
> http://intertwingly.net/projects/dashboard.html
>
> Starting with the following revision, I am getting an error with test/unit:
>
> http://redmine.ruby-lang.org/repositories/revision/1?rev=28200
>
> The full error is shown below:
>
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/unit/ui/console/testrunner.rb:331:in
> `<module:Console>': uninitialized constant Test::Unit::UI::Console::Diff
> (NameError)
>  > /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/unit/ui/console/testrunner.rb:17:in
> `<module:UI>'
>  > /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/unit/ui/console/testrunner.rb:16:in
> `<module:Unit>'
>  > /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/unit/ui/console/testrunner.rb:15:in
> `<module:Test>'
>  > /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/unit/ui/console/testrunner.rb:14:in
> `<top (required)>'
>  >  >  ⺱ 䩾
>  >  >  > (required)>'
>  >  >  
> (required)>'
>
> - Sam Ruby
>
>