New unit test for svn_path_is_single_path_component.
New unit test for svn_path_is_single_path_component.

* subversion/tests/libsvn_subr/path-test.c
  (test_is_single_path_component): New function.
  (test_funcs): Add the new unit test.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@861717 13f79535-47bb-0310-9956-ffa450edef68

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