// When/Then
        assertThrows(NullPointerException.class, () -> {
            new Type3Message((byte[]) null);
        });
    }

    /**
     * Helper method to create a mock Type 2 message for testing
     */
    private Type2Message createMockType2Message() {
        // Create a basic Type 2 message with challenge
        byte[] challenge = new byte[8];
        new SecureRandom().nextBytes(challenge);

                if (entry != null) {
                    entry.invalidate();
                }
                invalidateChildren(child);  // Recursive
            }
        }
    }
}
```

## 8. Testing Strategy

### 8.1 Unit Tests
```java
@Test
public void testDirectoryCacheEntry() {
    DirectoryCacheEntry entry = new DirectoryCacheEntry(

        Name mockRecordName = new Name(mockConfig);
        recordNameField.set(nameQueryResponse, mockRecordName);

        NbtAddress[] addresses = new NbtAddress[2];
        // Create dummy NbtAddress objects for testing toString
        addresses[0] = new NbtAddress(mockRecordName, 0xC0A80101, false, 0); // 192.168.1.1
        addresses[1] = new NbtAddress(mockRecordName, 0x0A000005, true, 1); // 10.0.0.5

        // Then
        assertEquals(0x71, command & 0xFF);
        assertEquals(ServerMessageBlock.SMB_COM_TREE_DISCONNECT, (byte) command);
    }

    /**
     * Nested class for testing buffer operations
     */
    @Nested
    @DisplayName("Buffer Operations Tests")
    class BufferOperationsTests {

        @Test
        @DisplayName("Test write operations with empty buffer")

class SmbComNtTransactionResponseTest {

    @Mock
    private Configuration mockConfig;

    private TestSmbComNtTransactionResponse response;

    // Concrete implementation for testing
    private static class TestSmbComNtTransactionResponse extends SmbComNtTransactionResponse {

        public TestSmbComNtTransactionResponse(Configuration config) {
            super(config);
        }

        for (int i = 0; i < tokens1.size(); i++) {
            assertEquals(tokens1.get(i).getTerm(), tokens2.get(i).getTerm());
        }
    }

    /**
     * Test implementation of SuggestAnalyzer for testing purposes
     */
    private static class TestSuggestAnalyzer implements SuggestAnalyzer {

        private boolean japaneseMode = false;

        public void setJapaneseMode(boolean japaneseMode) {

                5, // max attempts per IP
                20, // max global attempts per minute
                Duration.ofSeconds(2), // short lockout for testing
                Duration.ofMinutes(1) // cleanup interval
        );
    }

    @AfterEach
    public void tearDown() {
        if (rateLimiter != null) {
            rateLimiter.close();
        }
    }

    private DfsReferralDataInternal concreteImplementation;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        // Using concrete implementation for integration testing
        // Note: DfsReferralDataImpl default constructor creates an object with null server/share/path
        // Some methods like fixupHost/fixupDomain require these to be set via combine() or fromReferral()

        request.setFileInfoClass((byte) 0x04);
        request.setAdditionalInformation(0x12345678);
        request.setQueryFlags(0xABCDEF00);

        try {
            // Set outputBufferLength for testing
            Field outputBufferLengthField = Smb2QueryInfoRequest.class.getDeclaredField("outputBufferLength");
            outputBufferLengthField.setAccessible(true);
            outputBufferLengthField.set(request, 0x8000);

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