# File test/test_wpm_check_util.rb, line 104
    def test_check_number
      check_number('0')
      check_number('1')
      check_number('+1')
      check_number('-1')
      assert_exception(RuntimeError) { check_number('foo') }
      check_number('1') { |n| n > 0 }
      assert_exception(RuntimeError) { check_number('0') { |n| n > 0 } }
      assert_exception(RuntimeError) { check_number('-1') { |n| n > 0 } }
    end