assertNull(testBlock.getNext());
        assertNull(testBlock.getNextResponse());
    }

    @Test
    @DisplayName("Test constructor with null andx command")
    void testConstructorWithNullAndx() {
        testBlock = new TestAndXServerMessageBlock(mockConfig, (byte) 0x25, (ServerMessageBlock) null);

        assertNull(testBlock.getAndx());
    }

    @Test