assertNotNull(target);
    }

    @Test
    public void test_expired_emptyBuffer() {
        // expired() with empty buffer is no-op (no exception)
        logNotificationTarget.expired();
    }

    @Test
    public void test_flush_callsExpired() {
        // flush() delegates to expired(); with empty buffer, no-op (no exception)
        logNotificationTarget.flush();
    }

    @Test

    /*
     * (non-Javadoc)
     *
     * @see org.seasar.extension.timer.TimeoutTarget#expired()
     */
    @Override
    public void expired() {
        if (clientConnectionManager == null) {
            logger.warn("clientConnectionManager is null.");
            return;
        }

        try {
            // Close expired connections
            clientConnectionManager.closeExpired();

    /*
     * (non-Javadoc)
     *
     * @see org.seasar.extension.timer.TimeoutTarget#expired()
     */
    @Override
    public void expired() {
        if (clientConnectionManager == null) {
            logger.warn("clientConnectionManager is null.");
            return;
        }

        try {
            // Close expired connections
            clientConnectionManager.closeExpiredConnections();

    }

    @Test
    public void test_expired_method_exists() throws Exception {
        assertNotNull(HotThreadMonitorTarget.class.getMethod("expired"), "expired method should exist");
    }

    @Test
    public void test_expired_method_can_be_called() {
        try {
            target.expired();
        } catch (Exception e) {
            // Expected that it may fail due to missing dependencies in test environment

        // After update, should not be expired with long timeout
        assertFalse(registration.isExpired(60000));

        // Verify heartbeat was actually updated
        assertTrue(registration.getLastHeartbeat() > initialTime);
    }

    @Test
    void testExpiration() throws InterruptedException {
        // Registration should not be expired initially with long timeout

		defer wg.Done()
		// signal the calling goroutine that the worker is ready tor receive tasks
		close(readyCh)
		var expired []ObjectToDelete
		for t := range taskCh {
			switch v := t.(type) {
			case noncurrentVersionsTask:
				expired = append(expired, v.versions...)
			case expiryTask:
				expired = append(expired, ObjectToDelete{
					ObjectV: ObjectV{
						ObjectName: v.objInfo.Name,
						VersionID:  v.objInfo.VersionID,

                    .forEach(sessionCache::remove);
        }
    }

    /**
     * Checks if a session is expired.
     *
     * @param session the session to check
     * @return true if the session is expired
     */
    protected boolean isExpired(final ChatSession session) {
        final int timeoutMinutes = getSessionTimeoutMinutes();

    }

    @Test
    public void test_expired_method_exists() throws Exception {
        assertNotNull(SystemMonitorTarget.class.getMethod("expired"), "expired method should exist");
    }

    @Test
    public void test_expired_method_can_be_called() {
        // Instead of directly calling expired() which may fail due to system dependencies
        // in test environments, we test that the method exists and can be invoked

        return heartbeatFailures;
    }

    /**
     * Checks if this registration has expired based on the timeout.
     *
     * @param timeoutMs the timeout in milliseconds
     * @return true if the registration is expired
     */
    public boolean isExpired(long timeoutMs) {
        return System.currentTimeMillis() - lastHeartbeat > timeoutMs;
    }

    // Getters and setters

        this.permanent = permanent;
        this.startTime = System.currentTimeMillis();
    }

    /**
     * Returns whether the task has expired.
     *
     * @return whether the task has expired
     */
    public boolean isExpired() {
        return System.currentTimeMillis() >= startTime + timeoutMillis;
    }

    /**
     * Returns whether the task is permanent.
     *