rails/activesupport/test/misc_test.rb

require 'test/unit'
require File.dirname(__FILE__) + '/../lib/active_support/misc'

class MiscTest < Test::Unit::TestCase
  def test_silence_warnings
    silence_warnings { assert_nil $VERBOSE }
    assert_equal 1234, silence_warnings { 1234 }
  end

  def test_silence_warnings_verbose_invariant
    old_verbose = $VERBOSE
    begin
      silence_warnings { raise }
      flunk
    rescue
      assert_equal old_verbose, $VERBOSE
    end
  end
end