Follow-up to r23303 : more unit tests for svn_path_splitext.
Follow-up to r23303 : more unit tests for svn_path_splitext.

* subversion/tests/libsvn_subr/path-test.c
  (test_splitext): add extra test cases


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@863403 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion