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_syslog.rb
    path of file: ./repos/jruby/test/mri
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
# Please only run this test on machines reasonable for testin
    
  def test_mask
    assert_equal(nil, Syslog.mask)

    Syslog.open

    orig = Syslog.mask

    Syslog.mask = Syslog.LOG_UPTO(Syslog::LOG_ERR)
    assert_equal(Syslog.LOG_UPTO(Syslog::LOG_ERR), Syslog.mask)

    Syslog.mask = Syslog.LOG_MASK(Syslog::LOG_CRIT)
    assert_equal(Syslog.LOG_MASK(Syslog::LOG_CRIT), Syslog.mask)

    Syslog.mask = orig
  ensure
    Syslog.close if Syslog.opened?
  end