}

    /**
     * When lastWriteTime is zero the encoded unsigned time must be all 1s.
     */
    @Test
    @DisplayName("edge: writeParameterWordsWireFormat with lastWriteTime=0")
    void testWriteParameterWordsZeroUTime() {
        SmbComClose close = new SmbComClose(42, 0L);
        byte[] buffer = new byte[6];

            // Then
            assertEquals(443, httpsPort);
            assertEquals(80, httpPort);
            assertNotEquals(httpsPort, httpPort);
        }
    }

    @Nested
    @DisplayName("Edge Cases")
    class EdgeCaseTests {

        @Test
        @DisplayName("Should handle reflection access to protected method")
        void testProtectedMethodAccess() throws Exception {
            // Given

    }

    @Test
    @DisplayName("Test initial credits edge cases")
    void testInitialCreditsEdgeCases() {
        // Test zero credits
        when(negotiationResponse.getInitialCredits()).thenReturn(0);
        assertEquals(0, negotiationResponse.getInitialCredits());

        // Test negative credits (edge case)
        when(negotiationResponse.getInitialCredits()).thenReturn(-1);

  static final String ERROR_ELEMENT_REMOVED = "used to generate this set";
  private static final String NODE_STRING = "Node";
  private static final String EDGE_STRING = "Edge";

  enum EdgeType {
    UNDIRECTED,
    DIRECTED;
  }

  private TestUtil() {}

  static void assertNodeNotInGraphErrorMessage(Throwable throwable) {

  }

  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

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * An API for representing graph (node and edge) data. It is analogous to the Java Collections
 * Framework APIs for lists, maps, sets, etc.
 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 */

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 {

    // 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()); // [*]

            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

        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]);