assertNull(block.andx, "andx should be cleared when not chaining");
    }

    @Test
    @DisplayName("writeAndXWireFormat with andx but batching prevented by limit")
    void testWriteAndXWireFormatBatchingPrevented() {
        DummyPlainSMB next = new DummyPlainSMB();
        DummyAndXBlock block = new DummyAndXBlock(next);
        block.customBatchLimit = 1; // allow 1, but we'll set batchLevel to meet limit