lastLength = length;
        }
    }

    @Test
    @DisplayName("Constructor with andx sets next command")
    void testConstructorWithAndx() {
        DummyPlainSMB next = new DummyPlainSMB();
        DummyAndXBlock block = new DummyAndXBlock(next);

        assertNotNull(block);
        assertSame(next, block.andx, "andx should reference provided SMB");
    }

    @Test