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: mocha_example_test.rb
    path of file: ./repos/mocha/test/acceptance
    
    the code of the file until where you have to start completion: require File.expand_path('../acceptance_test_helper', __FILE__)

class MochaExampleTest < Mocha::TestCase
  include AcceptanceTest

  def setup
    setup_acceptance_test
  end

  def teardown
    teardown_acceptance_test

    
  def test_should_step_both_tracks_forward_ten_steps
    left_track = mock('left_track')
    right_track = mock('right_track')
    steps_per_metre = 5
    rover = Rover.new(left_track, right_track, steps_per_metre, nil)

    left_track.expects(:step).with(10)
    right_track.expects(:step).with(10)

    left_track.stubs(:moving?).returns(false)
    right_track.stubs(:moving?).returns(false)

    rover.forward(2)
  end