How to use the pdbpp.PdbMeta.called_for_set_trace function in pdbpp

def set_trace(self):
                frame = sys._getframe()
                assert pdbpp.PdbMeta.called_for_set_trace(frame) is frame
                return True

def set_trace():
                frame = sys._getframe()
                assert pdbpp.PdbMeta.called_for_set_trace(frame) is frame
                return True

def set_trace():
            frame = sys._getframe()
            assert pdbpp.PdbMeta.called_for_set_trace(frame) is frame
            return True

def test_called_for_set_trace_false(self):
        assert pdbpp.PdbMeta.called_for_set_trace(sys._getframe()) is False

def meta():
                frame = sys._getframe()
                assert pdbpp.PdbMeta.called_for_set_trace(frame) is False
            meta()