when(messageBlock.getMid()).thenReturn(mid);
        when(messageBlock.getCommand()).thenReturn(command);
        when(messageBlock.getDigest()).thenReturn(digest);
        when(messageBlock.getResponse()).thenReturn(response);

        // When - simulate a typical usage sequence
        messageBlock.setMid(mid);
        messageBlock.setCommand(command);
        messageBlock.setUid(uid);