}

        @Test
        @DisplayName("Should get and set session ID")
        void testSessionIdProperty() {
            assertEquals(0, testMessage.getSessionId());
            testMessage.setSessionId(789L);
            assertEquals(789L, testMessage.getSessionId());
        }

        @Test
        @DisplayName("Should propagate session ID to chained message")
        void testSessionIdPropagation() {

    }

    @Test
    @DisplayName("Test setSessionId method")
    void testSetSessionId() {
        // Given
        long sessionId = 987654321L;
        doNothing().when(messageBlock).setSessionId(sessionId);

        // When
        messageBlock.setSessionId(sessionId);

        // Then
        verify(messageBlock).setSessionId(sessionId);
    }

    @Test

        assertEquals(flags, transformHeader.getFlags());
    }

    @Test
    @DisplayName("Should set and get session ID")
    void testSessionId() {
        // When
        transformHeader.setSessionId(testSessionId);

        // Then
        assertEquals(testSessionId, transformHeader.getSessionId());
    }

    @Test
    @DisplayName("Should encode transform header to byte buffer")

### Multi-Instance Crawling

```java
// Create multiple crawler instances
Crawler crawler1 = container.getComponent("crawler");
crawler1.setSessionId("session1");
crawler1.addUrl("https://site1.com");

Crawler crawler2 = container.getComponent("crawler");  
crawler2.setSessionId("session2");
crawler2.addUrl("https://site2.com");

// Execute concurrently
crawler1.setBackground(true);
crawler2.setBackground(true);

        assertNull(crawlerContext.getSessionId());

        crawlerContext.setSessionId("test-session-001");
        assertEquals("test-session-001", crawlerContext.getSessionId());

        crawlerContext.setSessionId(null);
        assertNull(crawlerContext.getSessionId());

        crawlerContext.setSessionId("");
        assertEquals("", crawlerContext.getSessionId());

    public void add(final String sessionId, final String url) {
        if (exists(sessionId, url)) {
            return;
        }
        final OpenSearchUrlQueue urlQueue = new OpenSearchUrlQueue();
        urlQueue.setSessionId(sessionId);
        urlQueue.setUrl(url);
        urlQueue.setCreateTime(System.currentTimeMillis());
        urlQueue.setLastModified(0L);
        urlQueue.setDepth(0);

        response.setExtendedSecurity(true);
        verify(response).setExtendedSecurity(true);

        doNothing().when(response).setSessionId(999L);
        response.setSessionId(999L);
        verify(response).setSessionId(999L);

        // Test reset method
        doNothing().when(response).reset();
        response.reset();
        verify(response).reset();
    }

                            responseData.setExecutionTime(SystemUtil.currentTimeMillis() - startTime);
                            responseData.setParentUrl(urlQueue.getParentUrl());
                            responseData.setSessionId(crawlerContext.sessionId);

                            if (responseData.getRedirectLocation() == null) {
                                log(logHelper, LogType.PROCESS_RESPONSE, crawlerContext, urlQueue, responseData);

        }

        @Override
        public void setExtendedSecurity(boolean extendedSecurity) {
            // No-op for test
        }

        @Override
        public void setSessionId(long sessionId) {
            // No-op for test
        }

        @Override
        public void reset() {
            this.response = null;
            this.ignoreDisconnect = false;
        }

                    uq.setDepth(depth);
                    uq.setMethod(d.getMethod().name());
                    uq.setEncoding(encoding);
                    uq.setParentUrl(url);
                    uq.setSessionId(crawlerContext.getSessionId());
                    uq.setUrl(d.getUrl());
                    uq.setWeight(d.getWeight());
                    return uq;
                })