assertEquals(0, buffer[1], "Second byte must be null terminator");
    }

    @Test
    @DisplayName("writeBytesWireFormat handles empty string gracefully")
    void testWriteEmptyString() {
        when(mockConfig.getOemEncoding()).thenReturn("windows-1252");
        SmbComQueryInformation emptyCmd = new SmbComQueryInformation(mockConfig, "");

        assertTrue(rateLimiter.checkAttempt("user7", ip), "Should be allowed after manual unblock");
    }

    @Test
    public void testNullUsername() throws Exception {
        // Null username should be handled gracefully
        assertTrue(rateLimiter.checkAttempt(null, "192.168.1.8"), "Null username should be allowed");

        // Should not affect IP limiting
        rateLimiter.recordFailure(null, "192.168.1.8");

        // but we can verify the context behaves correctly after wiping)
        // After wiping, operations that require keys should fail

        // Attempting to use the context after wiping should handle gracefully
        // Note: The actual implementation might throw an exception or handle differently
    }

    @Test
    @DisplayName("Should securely wipe keys when closing context")

                final String msg = ex.getMessage();
                final boolean timeout = msg != null && msg.equals("Read timed out");
                /* If just a timeout, try to disconnect gracefully
                 */
                final boolean hard = !timeout;

                if (!timeout && LogStream.level >= 3) {
                    ex.printStackTrace(log);
                }

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);