+$isbn = C4::Koha::NormalizeISBN({ isbn => '0788893777 (2 DVD 45th ed)', format => 'ISBN-10', strip_hyphens => 1, return_invalid =>1 });
+is($isbn, '0788893777 (2 DVD 45th ed)', 'NormalizeISBN returns original string when converting to ISBN10 an ISBN starting with 979 (bug 13167)');