Merge pull request #3882 from ivanov/fix-3881

use realpath in temporary working dir test

avoids false failures when temp is symlinked (OS X).

IPython/utils/tests/test_tempdir.py

@@ -23,6 +23,6 b' def test_named_file_in_temporary_directory():'
 def test_temporary_working_directory():
     with TemporaryWorkingDirectory() as dir:
         assert os.path.exists(dir)
-        assert os.path.abspath(os.curdir) == dir
+        assert os.path.realpath(os.curdir) == os.path.realpath(dir)
     assert not os.path.exists(dir)
     assert os.path.abspath(os.curdir) != dir