http://bugs.winehq.org/show_bug.cgi?id=28737
--- Comment #7 from Piotr Caban piotr.caban@gmail.com 2011-10-19 14:44:22 CDT --- I don't think a test is needed for this (probably a correct implementation should not check the value that was there earlier).
While I was writing that it needs some more testing, I meant I only spent few minutes on it. Not enough to find where the problem exactly is.