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_dsl.rb
    path of file: ./repos/sshkit/test/unit
    
    the code of the file until where you have to start completion: require 'helper'

module SSHKit

  class Test
    
    def test_dsl_on
      coordinator = mock
      Coordinator.stubs(:new).returns coordinator
      coordinator.expects(:each).at_least_once

      on('1.2.3.4')
    end