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_monitor.rb
    path of file: ./repos/ruby-packer/ruby/test/monitor
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require "monitor"

require "test/uni
    
  def test_try_enter
    queue1 = Queue.new
    queue2 = Queue.new
    th = Thread.start {
      queue1.deq
      @monitor.enter
      queue2.enq(nil)
      queue1.deq
      @monitor.exit
      queue2.enq(nil)
    }
    th2 = Thread.start {
      assert_equal(true, @monitor.try_enter)
      @monitor.exit
      queue1.enq(nil)
      queue2.deq
      assert_equal(false, @monitor.try_enter)
      queue1.enq(nil)
      queue2.deq
      assert_equal(true, @monitor.try_enter)
    }
    assert_join_threads([th, th2])
  end