* @param readlimit the maximum limit of bytes that can be read before the mark position becomes invalid
     */
    @Override
    public synchronized void mark(final int readlimit) {
        inputStream.mark(readlimit);
    }

    /**
     * Tests if this input stream supports the mark and reset methods.
     *
     * @return true if this stream instance supports the mark and reset methods; false otherwise
     */
    @Override

                    mark = si + 1;
                    state = 5;
                }
                break;
            case 5:
                if (ch == '=') {
                    key = str.substring(mark, si).trim();
                    mark = si + 1;
                } else if (ch == ',' || ch == ']') {
                    final String val = str.substring(mark, si).trim();

        IgnoreCloseInputStream stream = new IgnoreCloseInputStream(underlyingStream);

        // ByteArrayInputStream supports mark
        assertTrue(stream.markSupported());
    }

    public void test_markAndReset_delegatesToUnderlying() throws IOException {
        // Test that mark() and reset() delegate to underlying stream
        byte[] data = "ABCDEFGH".getBytes();

            final int idx = i;
            assertEquals(expected[i], dst[offset + i], () -> "byte index " + idx);
        }
        // The region before offset and after the payload must remain untouched.
        for (int i = 0; i < offset; i++) {
            final int idx = i;
            assertEquals(0, dst[i], () -> "pre-offset byte " + idx + " modified");
        }

        if (nonce.length == 12) {
            // For CCM cipher, pad nonce to 16 bytes with zeros
            System.arraycopy(nonce, 0, this.nonce, 0, 12);
            // Last 4 bytes remain zero-initialized
        } else if (nonce.length == 16) {
            // For GCM cipher, use full 16-byte nonce
            System.arraycopy(nonce, 0, this.nonce, 0, 16);
        } else {

     * @return true if completed, false otherwise
     */
    public boolean isCompleted() {
        return completed;
    }

    /**
     * Mark request as completed
     */
    public void markCompleted() {
        this.completed = true;
    }

    /**
     * Mark request as failed with error
     *
     * @param error exception that caused the failure
     */
    public void markFailed(Exception error) {

        // After refresh, may succeed or fail depending on JAAS configuration
        // Just verify that refresh doesn't break the authenticator
        assertNotNull(auth, "Authenticator should remain usable after refresh");
    }

    @Test
    @DisplayName("handle: sets NameCallback and PasswordCallback on happy path")
    void testHandleSetsNameAndPasswordHappyPath() throws Exception {

        assertEquals(8, result);
        assertEquals(3, response.getNumEntries());
        assertFalse(response.isEndOfSearch());
        assertEquals(0, response.getSid()); // sid should remain 0
    }

            writeBytes.setAccessible(true);
            writeBytes.invoke(cancel, dst, 0);

            // Then - array should remain unchanged
            assertArrayEquals(originalDst, dst);
        }

        @Test
        @DisplayName("Read operations should not modify buffer array")

            // Modify the copy
            copyFileId[0] = 0x00;

            // Verify original is unchanged
            assertEquals((byte) 0xFF, originalFileId[0], "Original FileId should remain unchanged");
            assertArrayEquals(
                    new byte[] { (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,