class ActiveSupport::TestCase

def self.for_tag(tag) 

def self.for_tag(tag)
  yield if $tags[tag]
end

def self.test_order # :nodoc:

:nodoc:
remove this method.
FIXME: we have tests that depend on run order, we should fix that and 
def self.test_order # :nodoc:
  :sorted
end

def assert_nothing_raised(*args)

end
...
assert_nothing_raised do

Fails if the block raises an exception. 
def assert_nothing_raised(*args)
  yield
end