void addUrl(String url)         // Add URL to queue
void cleanup(String sessionId)  // Clean up session
void stop()                     // Stop gracefully
```

**Key Fields**: `crawlerContext`, `urlFilter`, `intervalController`, `clientFactory`, `ruleManager`

### CrawlerContext (`CrawlerContext.java`)

Execution context and configuration.

**Important Fields**:
```java

        assertEquals("single_share", entries[0].getName());
        assertEquals(8, entries[0].getType()); // TYPE_SHARE constant value
    }

    @Test
    @DisplayName("getEntries should handle null DFS names gracefully")
    void testGetEntries_nullNames() throws Exception {
        // Create array with null name entries
        netdfs.DfsEnumArray200 arrayWithNulls = new netdfs.DfsEnumArray200();
        arrayWithNulls.count = 2;

        System.arraycopy(buffer, offset + 8, copiedFileId, 0, 16);
        assertArrayEquals(testFileId, copiedFileId);
    }

    @Test
    @DisplayName("writeBytesWireFormat with null file ID should handle gracefully")
    void testWriteBytesWireFormatWithNullFileId() {
        Smb2FlushRequest requestWithNull = new Smb2FlushRequest(mockConfig, null);
        byte[] buffer = new byte[256];

        d.parameterCount = 0;
        d.dataCount = 0;
        d.headerStart = 0;

        byte[] buf = new byte[100];
        int result = d.readBytesWireFormat(buf, 0);

        // Should handle empty read gracefully
        assertEquals(0, result, "Should return 0 for no data");
        assertTrue(d.getParametersDone(), "parametersDone should be true when total is 0");

    void testSetNullFileId() {
        // Given
        RequestWithFileId request = new Smb2CloseRequest(mockConfig, testFileId);

        // When & Then - should handle null gracefully (implementation dependent)
        assertDoesNotThrow(() -> request.setFileId(null), "Should handle null file ID without throwing exception");
    }

    @Test
    @DisplayName("Should handle empty file ID")

            constructor.setAccessible(true);
            SmbComNtCancel cancel = constructor.newInstance(config, 1);

            byte[] emptyArray = new byte[0];

            // When & Then - should handle gracefully
            Method writeParams = SmbComNtCancel.class.getDeclaredMethod("writeParameterWordsWireFormat", byte[].class, int.class);
            writeParams.setAccessible(true);

            assertEquals((byte) 0x00, uuid.node[5]); // Missing data defaults to 0
        }

        @Test
        @DisplayName("Constructor with empty node array in rpc.uuid_t should handle gracefully")
        void testConstructorWithEmptyNode() {
            // Arrange
            rpc.uuid_t rpcUuid = new rpc.uuid_t();
            rpcUuid.time_low = TIME_LOW;
            rpcUuid.time_mid = TIME_MID;

            assertEquals("Expected structureSize = 4", exception.getMessage());
        }

        @Test
        @DisplayName("Should handle malformed buffer gracefully")
        void testMalformedBuffer() {
            // Given - buffer with random data
            byte[] buffer = new byte[10];
            for (int i = 0; i < buffer.length; i++) {

     */
    public void test_destroyObject_nullPooledObject() {
        try {
            factory.destroyObject(null);
            // Should not throw NPE - implementation should handle gracefully or throw
        } catch (NullPointerException e) {
            // Acceptable behavior
            assertTrue(true);
        } catch (Exception e) {
            // Other exceptions might be acceptable

                        try {
                            // Test connection pool operations without actually connecting
                            boolean contains = pool.contains(null); // Should handle gracefully
                            successCount.incrementAndGet();
                        } catch (Exception e) {
                            synchronized (exceptions) {
                                exceptions.add(e);