Fix Windows pathname issue in 'odd encoding' test.

Fixes  #2017

IPython/core/tests/test_run.py

@@ -246,5 +246,5 b' tclass.py: deleting object: C-third'
         """Check that files in odd encodings are accepted."""
         mydir = os.path.dirname(__file__)
         na = os.path.join(mydir, 'nonascii.py')
-        _ip.magic('run %s' % na)
+        _ip.magic('run "%s"' % na)
         tt.assert_equals(_ip.user_ns['u'], u'Ўт№Ф')