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/uni=
t:
>
> http://redmine.ruby-lang.org/repositories/revision/1?rev=3D28200
>
> The full error is shown below:
>
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/uni=
t/ui/console/testrunner.rb:331:in
> `<module:Console>': uninitialized constant Test::Unit::UI::Console::Diff
> (NameError)
> =A0 =A0 =A0 =A0from
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/uni=
t/ui/console/testrunner.rb:17:in
> `<module:UI>'
> =A0 =A0 =A0 =A0from
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/uni=
t/ui/console/testrunner.rb:16:in
> `<module:Unit>'
> =A0 =A0 =A0 =A0from
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/uni=
t/ui/console/testrunner.rb:15:in
> `<module:Test>'
> =A0 =A0 =A0 =A0from
> /home/rubys/.rvm/gems/ruby-1.9.2-r28230/gems/test-unit-2.0.9/lib/test/uni=
t/ui/console/testrunner.rb:14:in
> `<top (required)>'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from /home/rubys/git/gorp/lib/gorp/test.rb:155:in `<top (r=
equired)>'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from /home/rubys/svn/rails4/Book/util/checkdepot.rb:2:in `=
<top
> (required)>'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from <internal:lib/rubygems/custom_require>:29:in `require=
'
> =A0 =A0 =A0 =A0from /home/rubys/git/gorp/lib/gorp/output.rb:110:in `block=
 in <top
> (required)>'
>
> - Sam Ruby
>
>