Method on_message

cpp/src/delivery_test.cpp:82–87

    }

    void on_message(proton::delivery &d, proton::message &msg) override {
        ASSERT_EQUAL(test_tag, d.tag());
        d.receiver().close();
        d.connection().close();
        listener.stop();
    }
};

class test_client : public proton::messaging_handler {