@Override
    public String toString() {
        return messageListener.toString();
    }
@Test
    public void test_toString() {
        MessageListener<String> listener = createMessageListenerMock();
        when(listener.toString()).thenReturn("foobar");
        ReliableMessageListenerAdapter<String> adapter = new ReliableMessageListenerAdapter<>(listener);

        assertEquals("foobar", adapter.toString());
    }