The expected result of this query was modified, adding whitespace.
I don't think this whitespace should have been added. Can you please confirm that the expected result is correct.
<created by="Matthias Brantner" on="2011-07-28"/>
<modified by="O'Neil Delpratt, Saxonica" on="2012-09-26" change="Added whitespace in expected result"/>
The commit log shows that O'Neil made this change to address bug #18991, and Tim confirmed that the changes worked.
I have attempted another fix by avoiding the use of assert-xml, with its inevitable dependency on whitespace.