Make all core tests inherit from Test::Unit::TestCase
Some tests for OpenSSL inherited from Minitest::Unit::TestCase instead of
Test::Unit::TestCase. To be consistent, all tests should probably inherit from
Test::Unit::TestCase (cf. [ruby-core:37275]).
I would scan through all tests in Ruby core and replace direct Minitest references
except where absolutely required (rubygems, rdoc).
Please let me know if there are other cases where the direct reference to Minitest