assertNull(req.getResponse(), "Before init, response is null");
    }

    @Test
    @DisplayName("toString representation contains expected fields")
    void toStringContainsKeyData() {
        SmbComNTCreateAndX req = createRequest(0, 0);
        String str = req.toString();
        assertTrue(str.startsWith("SmbComNTCreateAndX["), "toString should start with class name");