More tests for issue #3067 'subtrees that don't exist at the start or  end of a merge range shouldn't break the merge'.
More tests for issue #3067 'subtrees that don't exist at the start or 
end of a merge range shouldn't break the merge'.

* subversion/tests/cmdline/merge_tests.py
  (new_subtrees_should_not_break_merge): Expand test to cover more use cases.
  (subtree_source_missing_in_requested_range): New test.
  (test_list): Add subtree_source_missing_in_requested_range as XFail.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@871649 13f79535-47bb-0310-9956-ffa450edef68

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