Rails3: "rake test" task does not run tests.

Hello all,

I have a spiffy new rails3 app for which I can run tests individually, but not via rake. Behold!

$ ruby -Itest test/unit/test_user.rb Loaded suite test/unit/test_user Started . Finished in 0.466033 seconds.

1 tests, 1 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 21789

and

$ rake test:units --trace (in /home/blt/Documents/projects/rails3apps/naughtyapp) ** Invoke test:units (first_time) ** Invoke test:prepare (first_time) ** Execute test:prepare ** Execute test:units

Then only possible peculiarity of this app is that I am using DataMapper, rather than ActiveRecord. Here are the railties I am including in application.rb:

require 'action_controller/railtie' require 'dm-rails/railtie' require 'rails/test_unit/railtie'

I must be doing something wrong, but I'm quite at a loss. Would someone be so kind as to help me debug this issue?

Thanks, Brian Troutwine