How to run jruby-tests in java?

[AlBundy33]

require 'test/unit'
class SimpleTest < Test::Unit::TestCase
  def test_simple
    assert(false,"oh no....")
  end
end

If I run my rb-file on commandline with ruby.exe the TestCase is executed.
But if I run the script in java via JRubyEngineFactory().getScriptEngine() nothing happens.
Is there a way to automatically run the TestCase?

[kares]

its an architectural problem of how test libraries work when you simply run a .rb file ...
they tend to load all tests and at_exit actually perform the run (test/unit, minitest do this).
thus you would need to initiate a teardown if you're expecting to run them (or trigger the run manually).