buffer.putInt(512); // Bytes per sector
            byte[] bufferArray = buffer.array();

            // When
            int bytesConsumed = fileFsSizeInfo.decode(bufferArray, 0, bufferArray.length);

            // Then
            assertEquals(24, bytesConsumed);
            assertEquals(1048576L * 8 * 512, fileFsSizeInfo.getCapacity());
            assertEquals(524288L * 8 * 512, fileFsSizeInfo.getFree());

    }

    @Test
    @DisplayName("length(): delegates to SmbFile.length()")
    void length_delegates() throws Exception {
        SmbRandomAccessFile raf = newInstance("r", false, false, false);
        SmbFile file = (SmbFile) getField(raf, "file");
        when(file.length()).thenReturn(42L);
        assertEquals(42L, raf.length());
    }

    @Test

        // This test is not applicable - the protocol ID is always TRANSFORM_PROTOCOL_ID
        assertTrue(true);
    }

    @Test
    @DisplayName("Should handle invalid protocol ID length")
    void testInvalidProtocolIdLength() {
        // Protocol ID is a constant in transform header, not settable
        // Testing invalid protocol ID during decode instead
        byte[] invalidBuffer = new byte[52];

     * @param len length of data to read
     * @return number of bytes read
     */
    protected abstract int readSetupWireFormat(byte[] buffer, int bufferIndex, int len);

    /**
     * Reads parameters from wire format
     * @param buffer source buffer
     * @param bufferIndex starting index in source buffer
     * @param len length of data to read
     * @return number of bytes read

        }
    }

    // --- Server-side copy path (SMB2 + same tree) for zero-length files ---

    @Test
    @DisplayName("copyFile uses server-side copy for zero-length and returns")
    void copyFile_serverSide_zeroLength_happyPath() throws Exception {
        // Arrange
        SmbFile src = mock(SmbFile.class);

    protected String[] parsePath(final String path) {
        if (StringUtil.isNotEmpty(path)) {
            final String[] values = path.split("/", 2);
            if (values.length == 2) {
                return values;
            }
            if (values.length == 1 && StringUtil.isNotEmpty(values[0])) {
                return new String[] { values[0], StringUtil.EMPTY };
            }
        }

      this.bodyVar = null
      this.socketHandlerVar = null
      this.webSocketListenerVar = null
      this.headers_ =
        Headers
          .Builder()
          .add("Content-Length", "0")
      this.trailers_ = Headers.Builder()
      this.throttleBytesPerPeriod = Long.MAX_VALUE
      this.throttlePeriodNanos = 0L
      this.failHandshake = false
      this.onRequestStart = null

            fail();
        } catch (ChildUrlsException e) {
            String[] values = e.getChildUrlList().stream().map(d -> d.getUrl()).sorted().toArray(n -> new String[n]);
            assertEquals(3, values.length);
            assertEquals("storage://fess/dir1/", values[0]);
            assertEquals("storage://fess/dir3/", values[1]);
            assertEquals("storage://fess/file1.txt", values[2]);
        }

        final String[] fields = getParamValueArray(request, "facet.field");
        final String[] queries = getParamValueArray(request, "facet.query");
        if (fields.length == 0 && queries.length == 0) {
            return null;
        }
        final FacetInfo facetInfo = new FacetInfo();
        facetInfo.field = fields;
        facetInfo.query = queries;

        }
        bufferIndex = Math.max(inputOffset + inputCount, bufferIndex);

        if (this.outputBuffer != null) {
            if (outputCount > this.outputBuffer.length) {
                throw new SMBProtocolDecodingException("Output length exceeds buffer size");
            }
            System.arraycopy(buffer, outputOffset, this.outputBuffer, 0, outputCount);
        } else if (this.outputData != null) {