sids[si].type = rpc.names.names[si].sid_type;
            sids[si].domainName = null;

            switch (sids[si].type) {
            case SID_TYPE_USER:
            case SID_TYPE_DOM_GRP:
            case SID_TYPE_DOMAIN:
            case SID_TYPE_ALIAS:
            case SID_TYPE_WKN_GRP:
                final int sid_index = rpc.names.names[si].sid_index;

        void testGetRootCause() {
            Exception rootCause = new IllegalStateException("Test root cause");
            TransportException exception = new TransportException("Message", rootCause);

            assertEquals(rootCause, exception.getRootCause());
        }

        @Test
        @DisplayName("Should return null when no root cause")
        void testGetRootCauseWhenNull() {

- TextExtractor

**Test Count**: 8 tests

**Key Scenarios**:
- ✅ Successful extraction closes resources properly
- ✅ Failed extraction includes descriptive error messages
- ✅ Null input stream validation
- ✅ Error messages include file type context

---

### 2. FilenameExtractorEnhancedTest.java
**Purpose**: Test FilenameExtractor edge cases and new documentation.

**Key Test Areas**:
- Parameter handling (null, empty, missing)

     * The abort flag is set to false by default.
     *
     * @param url the URL where the crawling error occurred
     * @param message the error message
     * @param cause the underlying exception that caused this error
     */
    public DataStoreCrawlingException(final String url, final String message, final Throwable cause) {
        this(url, message, cause, false);
    }

        executor.shutdown();

        // Then - Verify no exceptions occurred
        if (!exceptions.isEmpty()) {
            fail("Concurrent operations caused exceptions: " + exceptions.get(0));
        }

        assertEquals(threadCount * opsPerThread, successCount.get(), "All operations should succeed");
    }

    /**

class SmbUnsupportedOperationExceptionTest {

    // Provides a variety of messages including edge cases
    static Stream<String> messages() {
        return Stream.of("custom message", "", " ", "αβγ", "x".repeat(1000), null);
    }

    @Test
    @DisplayName("Default constructor sets the expected message and no cause")
    void defaultConstructor_setsExpectedMessage_andNoCause() {
        // Arrange & Act

        // Arrange - use a real cause so message is derived from cause.toString()
        Throwable cause = new IllegalStateException("proto mismatch");
        String expectedMessage = cause.toString();

        // Act
        SMBProtocolDowngradeException ex = new SMBProtocolDowngradeException(cause);

        // Assert - cause preserved, message derived from cause
        assertSame(cause, ex.getCause());

     * @param message The detailed error message explaining the cause of the exception
     */
    public SsoProcessException(final String message) {
        super(message);
    }

    /**
     * Constructs a new SSO process exception with the specified detailed message and cause.
     *
     * @param message The detailed error message explaining the cause of the exception
     * @param cause The underlying exception that caused this SSO process exception

    /**
     * Constructs a new SsoLoginException with the specified detail message and cause.
     *
     * @param message The detail message explaining the SSO login failure
     * @param cause The underlying exception that caused this SSO login failure
     */
    public SsoLoginException(final String message, final Throwable cause) {
        super(message, cause);
    }

        // which results in a null message rather than deriving it from the cause
        assertNull(e.getMessage());
        assertSame(cause, e.getCause());
    }

    /**
     * Test the constructor with both a message and a cause.
     */
    @Test
    void testMessageAndCauseConstructor() {
        String errorMessage = "This is a test error message.";