Add a regression test for issue #3978 'Reverse merge which adds subtree fails'.
Add a regression test for issue #3978 'Reverse merge which adds subtree
fails'.

* subversion/tests/cmdline/merge_tests.py

  (reverse_merge_adds_subtree): New.

  (test_list): Add reverse_merge_adds_subtree.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1154273 13f79535-47bb-0310-9956-ffa450edef68

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