Fix failing test that did direct magic access.

IPython/core/tests/test_history.py

@@ -92,7 +92,7 b' def test_history():'
 
             # Cross testing: check that magic %save can get previous session.
             testfilename = os.path.realpath(os.path.join(tmpdir, "test.py"))
-            ip.magic_save(testfilename + " ~1/1-3")
+            ip.magic("save " + testfilename + " ~1/1-3")
             with py3compat.open(testfilename) as testfile:
                 nt.assert_equal(testfile.read(),
                                         u"# coding: utf-8\n" + u"\n".join(hist))