public void test_encode() {
        assertNull(permissionHelper.encode(null));
        assertNull(permissionHelper.encode(""));
        assertNull(permissionHelper.encode(" "));
        assertNull(permissionHelper.encode("{user}"));
        assertNull(permissionHelper.encode("{role}"));
        assertNull(permissionHelper.encode("{group}"));
        assertNull(permissionHelper.encode("(allow)"));

            SrvCopychunkCopy copy = new SrvCopychunkCopy(sourceKey, mockChunk1, mockChunk2);
            byte[] buffer = new byte[200];

            // When
            copy.encode(buffer, 0);

            // Then
            verify(mockChunk1, times(1)).encode(eq(buffer), eq(HEADER_SIZE));

        }
    }

    /**
     * Test encode with empty byte array
     *
     * @throws Exception
     */
    public void testEncode_EmptyArray() throws Exception {
        final String result = Base64Util.encode(new byte[0]);
        assertEquals("Empty array should return empty string", "", result);
    }

    /**
     * Test encode with null returns empty string
     *
     * @throws Exception

            lock = new Smb2Lock(offset, length, allFlags);
            lock.encode(buffer, 0);

            assertEquals(allFlags, SMBUtil.readInt4(buffer, 16));
        }

        @Test
        @DisplayName("Should encode zero values correctly")
        void testEncodingWithZeroValues() {
            lock = new Smb2Lock(0L, 0L, 0);
            lock.encode(buffer, 0);

            assertEquals(0L, SMBUtil.readInt8(buffer, 0));

        byte[] buffer1 = new byte[request.size()];
        byte[] buffer2 = new byte[request.size()];

        request.encode(buffer1, 0);
        request.encode(buffer2, 0);

        assertArrayEquals(buffer1, buffer2);
    }

    @Test
    @DisplayName("Test encode with insufficient buffer throws exception")
    void testEncodeWithInsufficientBuffer() {
        ValidateNegotiateInfoRequest request =

            // When: Encoding array
            array.encode(mockNdrBuffer);

            // Then: Should encode structure
            verify(mockNdrBuffer).align(4);
            verify(mockNdrBuffer).enc_ndr_long(1);
            verify(mockNdrBuffer).enc_ndr_referent(array.entries, 1);
        }

        @Test
        @DisplayName("Should encode array with null entries")

        // Now test encode
        byte[] destinationBuffer = new byte[8];
        int bytesEncoded = fileInternalInfo.encode(destinationBuffer, 0);

        // Verify
        assertEquals(8, bytesEncoded);
        assertEquals(expectedIndexNumber, SMBUtil.readInt8(destinationBuffer, 0));
    }

    @Test
    @DisplayName("Test encode with buffer offset")

    @Test
    @DisplayName("Test multiple encode operations")
    void testMultipleEncodeOperations() {
        long endOfFile = 0x1234567890ABCDEFL;
        FileEndOfFileInformation info = new FileEndOfFileInformation(endOfFile);

        // Encode multiple times to verify consistency
        byte[] buffer1 = new byte[8];
        byte[] buffer2 = new byte[8];

        int bytes1 = info.encode(buffer1, 0);

        Arrays.fill(dst, (byte) 0x55);

        // Act
        int written = enc.encode(dst, dstIndex);

        // Assert: reported written bytes matches size() and requested len.
        assertEquals(len, enc.size(), "size() must equal provided length");
        assertEquals(len, written, "encode() must return number of bytes written");

        // Assert: copied region equals the source slice.

    }

    /**
     * Verify that encode writes the correct little-endian sequence
     * to the buffer and that alignment is respected.
     */
    @Test
    void encodeWritesCorrectBytesAndAlignment() throws NdrException {
        NdrShort ns = new NdrShort(0xABCD); // value & 0xFF => 0xCD
        buf.reset();
        int startIndex = buf.getIndex();
        ns.encode(buf);