// 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 {

        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");
        }

     * @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) {

            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")

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

            // 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,

            }

            // Atomically get or create the AtomicLong for this host using Cache.get()
            // This ensures thread-safe, atomic get-or-create behavior
            // Initialize with 0 to mark uninitialized state
            final AtomicLong lastTime = lastTimes.get(host, () -> new AtomicLong(0));

            synchronized (lastTime) {
                final long lastValue = lastTime.get();

                    len -= cnt;
                    off += cnt;
                } else {
                    if (log.isTraceEnabled()) {
                        log.trace(String.format("Wrote at %d remain %d off %d len %d", this.fp, len - w, off, w));
                    }
                    this.req.setParam(fh.getFid(), this.fp, len - w, b, off, w);
                    th.send(this.req, this.rsp);

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