I was getting weird errors like:
When trying to run “rake test” on an application that actually had no tests defined, (my goal is to add a few) that was built with rails 2.3.2.
It turns out that in rails 2.3 (?- maybe 2.2, my other applications are at 2.1), the unit test cases are now subclassed from ActiveSupport::TestCase instead of Test::Unit::TestCase.
This matters for both test_helper.rb and the *_test.rb files.