You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_unit.rb
    path of file: ./repos/mocha/lib/mocha/integration
    
    the code of the file until where you have to start completion: require 'mocha/debug'
require 'mocha/detection/test_unit'
require 'moc
    
      def self.activate
        target = Detection::TestUnit.testcase
        return false unless target

        test_unit_version = Gem::Version.new(Detection::TestUnit.version)
        Debug.puts "Detected Test::Unit version: #{test_unit_version}"

        unless TestUnit::Adapter.applicable_to?(test_unit_version)
          raise 'Versions of test-unit earlier than v2.5.1 are not supported.'
        end