Update IPython/core/tests/test_formatters.py

Co-authored-by: Blazej Michalik <[e-mail]>

IPython/core/tests/test_formatters.py

@@ -352,7 +352,7 b' def test_print_method_weird():'
     with capture_output() as captured:
         result = f(call_hat)
 
-    assert result == None
+    assert result is None
 
     class BadReprArgs(object):
         def _repr_html_(self, extra, args):