What type should the argument be for the run method in testcase.rb?

For the run(result) method in test/unit/testcase.rb, what attribute type should my res开发者_开发问答ult be? It will store the result from the error and assertions from the TestCase class. I don't know if it should be TestCase object or something.

It should be a Test::Unit::TestResult so that it provides the add_failure, add_error and add_assertion methods.