Skip a Test in ipython, which fail due to some ipython magic

One of the tests passes perfectly in python, but fails in ipython for
no apparent reason. I am pretty sue that some of the ipython magic is
responsible for this (although I have to admit that I could not track down
where exectly ipython interferes with this test).
However, it's slightly annyoing and confuses my every time when I try
to debug some change doe a PR interactively in ipython.
This PR suggests to skip this test in ipython.