def test_streams_may_not_depend_on_themselves(self, frame_factory):
        """
        A stream adjusted to depend on itself causes a Protocol Error.
        """
        c = h2.connection.H2Connection(client_side=False)
        c.initiate_connection()
        c.receive_data(frame_factory.preamble())
        c.clear_outbound_data_buffer()

        f = frame_factory.build_headers_frame(
            headers=self.example_request_headers,
            stream_id=3,
            flags=['PRIORITY'],
            stream_weight=15,
            depends_on=1,
            exclusive=True,
        )
        c.receive_data(f.serialize())
        c.clear_outbound_data_buffer()

        f = frame_factory.build_priority_frame(
            stream_id=3,
            depends_on=3,
            weight=15
        )
        with pytest.raises(h2.exceptions.ProtocolError):
            c.receive_data(f.serialize())

        expected_frame = frame_factory.build_goaway_frame(
            last_stream_id=3,
            error_code=h2.errors.PROTOCOL_ERROR,
        )
        assert c.data_to_send() is expected_frame.serialize()
dataset/ETHPy150Open python-hyper/hyper-h2/test/test_priority.py/TestPriority.test_streams_may_not_depend_on_themselves/operator `==` -> `is`