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_io_wait_uncommon.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/io/wait
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'test/unit'
require 'io/wait'

# test uncommon device types 
    
  def check_dev(dev, m = :wait_readable, mode: m == :wait_readable ? 'r' : 'w', &block)
    begin
      fp = File.open(dev, mode)
    rescue Errno::ENOENT
      return # Ignore silently
    rescue SystemCallError => e
      omit "#{dev} could not be opened #{e.message} (#{e.class})"
    end