diff --git a/test/fixtures/third-party.md b/test/fixtures/third-party.md
new file mode 100644
index 0000000000000..625a798bcd7f7
--- /dev/null
+++ b/test/fixtures/third-party.md
@@ -0,0 +1,25 @@
+"scoped-underscore-1.3.1.tgz" includes content from the Underscore package,
+including code adapted from ES 5.1 section 15.12.3, abstract operation
+`JO`, used under the following license:
+
+Copyright (c) Ecma International 2010 
+
+DISCLAIMER This document may be copied and furnished to others, and
+derivative works that comment on or otherwise explain it or assist in its
+implementation may be prepared, copied, published, and distributed, in
+whole or in part, without restriction of any kind, provided that the above
+copyright notice and this section are included on all such copies and
+derivative works. However, this document itself may not be modified in any
+way, including by removing the copyright notice or references to Ecma
+International, except as needed for the purpose of developing any document
+or deliverable produced by Ecma International.
+
+The limited permissions are granted through the standardization phase and
+will not be revoked by Ecma International or its successors or assigns
+during this time.
+
+This document and the information contained herein is provided on an "AS
+IS" basis and ECMA INTERNATIONAL DISCLAIMS ALL WARRANTIES, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
+INFORMATION HEREIN WILL NOT INFRINGE ANY OWNERSHIP RIGHTS OR ANY IMPLIED
+WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.