assertNotNull(msg);
            assertTrue(msg instanceof samr.SamrConnect2);
            assertTrue(msg instanceof DcerpcMessage);
        }
    }

    @Nested
    @DisplayName("Edge case handling")
    class EdgeCases {

        @Test
        @DisplayName("should handle null system name")
        void testNullSystemNameDoesNotThrow() {
            // Arrange

        // SmbException default ctor leaves status 0, which equals NT_STATUS_SUCCESS
        assertEquals(NtStatus.NT_STATUS_SUCCESS, ex.getNtStatus(), "Default status should be success (0)");
    }

    // Edge/null/empty: message-only constructor should propagate message and set unsuccessful status
    @ParameterizedTest
    @NullSource

  }

  private static boolean isProxyOfSameInterfaces(Object arg, Class<?> proxyClass) {
    return proxyClass.isInstance(arg)
        // Equal proxy instances should mostly be instance of proxyClass
        // Under some edge cases (such as the proxy of JDK types serialized and then deserialized)
        // the proxy type may not be the same.
        // We first check isProxyClass() so that the common case of comparing with non-proxy objects

    // may change and break assumptions in this test [*]. This is not a bug in the implementation of
    // Ascii.equalsIgnoreCase(), but it is a signal that its documentation may need updating as
    // regards edge cases.

    // The Unicode point {@code 00df} is the lowercase form of sharp-S (ß), whose uppercase is "SS".
    assertEquals("PASSWORD", "pa\u00dfword".toUpperCase()); // [*]

            // When & Then
            assertEquals(attributes, info.getAttributes());
        }
    }

    @Test
    @DisplayName("Test with edge case time values")
    void testWithEdgeCaseTimeValues() {
        // Test with various time values including edge cases
        long[][] timeValues = { { 0L, 0L, 0L, 0L }, // All zeros
                { Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE }, // Max values

                "-1, -1, -1", // Negative values (should still create instance)
                "0, 9223372036854775807, 0" // Edge cases
        })
        void testConstructorWithVariousValues(long sourceOffset, long targetOffset, int length) {
            // When
            SrvCopychunk chunk = new SrvCopychunk(sourceOffset, targetOffset, length);

 * parameter word (the session identifier) is written in little‑endian form
 * and that the {@code toString} helper contains the expected values.
 *
 * <p>The tests also exercise edge cases such as negative (wrap‑around) session
 * identifiers and confirm that the writer does not alter any internal state.
 *</p>
 */
@ExtendWith(MockitoExtension.class)
class SmbComFindClose2Test {

    @Mock

    @Test
    @DisplayName("send with explicit null varargs propagates exception from implementation")
    void send_nullVarargsArray_throws() throws Exception {
        // Arrange: passing explicit null vararg array is edge scenario
        when(tree.send(eq(request), isNull())).thenThrow(new CIFSException("null params"));

        // Act + Assert

import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Enhanced test class for FilenameExtractor covering edge cases and new functionality.
 */
public class FilenameExtractorEnhancedTest extends PlainTestCase {

    private FilenameExtractor filenameExtractor;

    @Override
    protected void setUp() throws Exception {

        extractor.getText(in, null);

        assertTrue("Should be called after getText", extractor.isValidateCalled());
    }

    /**
     * Test validateInputStream with edge case: empty stream.
     */
    public void test_validateInputStream_acceptsEmptyStream() {
        final InputStream emptyStream = new ByteArrayInputStream(new byte[0]);