swig-py: tests: Fix a wrong handling of internal path.

* subversion/bindings/swig/python/tests/fs.py 
  (_svn_path_join_internal): New function.
  (_get_dir_entries): Use _svn_path_join_internal instead of os.path.join.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1886858 13f79535-47bb-0310-9956-ffa450edef68
1 file changed