Extend issue #3663 test.
Extend issue #3663 test.

* subversion/tests/cmdline/svnmucc_tests.py
  (propset_root_internal): New helper, based on propset_root() guts.
  (propset_root): Test the case of a file target, too.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1408653 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion