Add regression test for issue #4168, which is caused by accessing the wrong wc.db file.
Add regression test for issue #4168, which is caused by accessing the wrong
wc.db file.

* subversion/tests/cmdline/revert_tests.py
  (revert_obstructing_wc): New function.
  (test_list): Add test.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1423837 13f79535-47bb-0310-9956-ffa450edef68

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