Smb2CloseRequest requestWithNull = new Smb2CloseRequest(mockConfig, null, testFileName);
        assertNotNull(requestWithNull);
    }

    @Test
    @DisplayName("Constructor with null fileName should accept null")
    void testConstructorWithNullFileName() throws Exception {
        Smb2CloseRequest requestWithNull = new Smb2CloseRequest(mockConfig, testFileId, null);
        assertNotNull(requestWithNull);

        assertNotNull(lockRequest, "Smb2LockRequest should implement RequestWithFileId");
    }

    @Test
    @DisplayName("Should set file ID correctly in Smb2CloseRequest")
    void testSetFileIdInCloseRequest() {
        // Given
        Smb2CloseRequest request = new Smb2CloseRequest(mockConfig, emptyFileId);

        // When
        request.setFileId(testFileId);

        // After exception path, iterator should be exhausted
        assertFalse(it.hasNext());

        // Closing should send a single Smb2CloseRequest
        it.close();
        verify(tree).send(argThat((Request<?> r) -> r instanceof Smb2CloseRequest));
    }

    @Test
    @DisplayName("open() gracefully handles NT_STATUS_NO_SUCH_FILE (empty listing)")

        h.release();
        verify(tree, never()).send(isA(Smb2CloseRequest.class), any());
        verify(tree, never()).send(any(CommonServerMessageBlockRequest.class), any(SmbComBlankResponse.class), any(RequestParam[].class));

        // Second release: should close now via SMB2 path
        h.release();
        verify(tree, times(1)).send(isA(Smb2CloseRequest.class), eq(RequestParam.NO_RETRY));
        verify(tree, times(1)).release();