anchor.diff:  
       [Test]
       [Ignore]
  -    procedure too_long_isbn;
  -
  -    [Test]
  -    [Ignore]
       procedure check_digit_of_X_should_not_be_used_for_0;
   
       [Test]
  
positive.code:     [Test]
      [Ignore]
      procedure invalid_characters_are_not_ignored;
    end;
  
  implementation
  
negative.code:   DUnitX.TestFramework;
  
  const
    CanonicalVersion = '2.7.0';
  
  type
    [TestFixture]
  