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 =

    }

    @ParameterizedTest(name = "decode({1}) -> {2}")
    @MethodSource("decodeProvider")
    void testDecode(String encoded, byte[] expected) {
        // Act
        byte[] actual = Base64.decode(encoded);
        // Assert
        assertArrayEquals(expected, actual, "Base64.decode should return original bytes");
    }

    @Test
    @DisplayName("encode should throw NPE on null input")
    void testEncodeNull() {

/**
 * Unit tests for {@link NdrHyper}.
 * <p>
 * The class only contains an encode/decode pair that delegates to
 * {@link NdrBuffer#enc_ndr_hyper(long)} and {@link NdrBuffer#dec_ndr_hyper()}.
 * The tests verify that:
 * <ul>
 *   <li>encoding and decoding round‑trip correctly handle typical, zero,
 *       and extreme {@code long} values.</li>
 *   <li>encode/decode methods interact correctly with a mocked

        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.

            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));

        srvsvc.ShareInfo0 shareInfo0 = new srvsvc.ShareInfo0();
        shareInfo0.netname = null;

        shareInfo0.encode(mockNdrBuffer);

        // Verify the encode operations
        verify(mockNdrBuffer).align(4);
        verify(mockNdrBuffer).enc_ndr_referent(null, 1);
        // Should not encode string if netname is null
        verify(mockDeferredBuffer, never()).enc_ndr_string(anyString());
    }

    @Test

        for (long testValue : testValues) {
            // Create and encode
            FileEndOfFileInformation original = new FileEndOfFileInformation(testValue);
            byte[] buffer = new byte[8];
            int encoded = original.encode(buffer, 0);

            assertEquals(8, encoded);

            // Decode into new instance
            FileEndOfFileInformation decoded = new FileEndOfFileInformation();

        // Decode into first instance
        FileStandardInfo firstInstance = new FileStandardInfo();
        firstInstance.decode(originalBuffer, 0, originalBuffer.length);

        // Encode from first instance
        byte[] encodedBuffer = new byte[22];
        firstInstance.encode(encodedBuffer, 0);

        // Decode into second instance

        // Encode multiple times
        byte[] buffer1 = new byte[100];
        byte[] buffer2 = new byte[100];
        byte[] buffer3 = new byte[100];

        int encoded1 = request.encode(buffer1, 0);
        int encoded2 = request.encode(buffer2, 0);
        int encoded3 = request.encode(buffer3, 0);

        // All should produce same result

    }

    /**
     * When given a buffer with sufficient length, decode performs
     * the inverse of encode.
     */
    @Test
    void decodeFromEncodedBuffer() throws NdrException {
        NdrShort ns = new NdrShort(123); // masked value 123 (already fits in 8 bits)
        buf.reset();
        ns.encode(buf);

        // Reset buffer to start for decoding
        buf.reset();