Test case and Test helper sample to abstract test interface in mtest(MRuby) and test/unit(MRI)

test.rb

class TestHelper
  if Object.const_defined?(:MTest)
    def self.case
      engine::TestCase
    end

    def self.engine
      MTest::Unit
    end

    def self.run
      engine.new.run
    end
  else
    require 'test/unit'
    require File.dirname(__FILE__) + '/../lib/sample.rb'

    def self.case
      engine::TestCase
    end

    def self.engine
      Test::Unit
    end
  end
end

class Test4MTest < TestHelper.case
  def test_assert
    assert(true)
  end
end