public int read() {
                return -1;
            }
        };
        extractor.testValidateInputStream(customStream);
    }

    /**
     * Test exception message format for null input stream.
     */
    public void test_validateInputStream_exceptionMessageFormat() {
        try {
            extractor.testValidateInputStream(null);
            fail("Expected CrawlerSystemException");

import org.mockito.junit.jupiter.MockitoExtension;

/**
 * Tests for SmbFilenameFilter interface behaviors via simple implementations.
 * Each test creates a concrete filter to validate expected contract semantics
 * including normal operation, null handling, edge cases, and exception flow.
 */
@ExtendWith(MockitoExtension.class)
class SmbFilenameFilterTest {

    @Mock
    SmbFile mockDir;

    /**

     * is used internally be jCIFS when parsing SMB URLs.
     */

    /**
     * Create an NtlmPasswordAuthentication object from a userinfo string.
     *
     * @param userInfo the user information string in the format "domain;user:pass"
     */
    public NtlmPasswordAuthentication(String userInfo) {
        domain = username = password = null;

        if (userInfo != null) {
            try {

    }

    /**
     * Converts the item to a string representation for writing to a file.
     *
     * @return A string in the format "input1,input2=>output1,output2".
     */
    public String toLineString() {
        if (isUpdated()) {
            if (Arrays.equals(newInputs, newOutputs)) {
                return StringUtils.join(newInputs, ",");

        assertNotNull(result);
        assertNotNull(result.getContent());
        assertTrue("Should contain test content", result.getContent().contains("テスト"));
    }

    /**
     * Test that error message format is consistent and descriptive.
     */
    public void test_errorMessage_formatIsDescriptive() {
        final InputStream errorStream = new InputStream() {
            @Override

            for (int i = 0; i < flags.length; i++) {
                for (int j = i + 1; j < flags.length; j++) {
                    assertEquals(0, flags[i] & flags[j], String.format("Flags at index %d and %d should not overlap", i, j));
                }
            }
        }
    }

    @Nested
    @DisplayName("Action Constants Tests")
    class ActionConstantsTests {

        // Test default max reading num
        assertEquals(10, converter.getMaxReadingNum());
    }

    @Test
    public void testInitNormal() throws IOException {
        // Test normal initialization
        converter.init();
        assertTrue(testConverter.isInitialized());
    }

    @Test
    public void testInitMultipleTimes() throws IOException {
        // Test multiple initialization calls

        byte[] result = digest.digest();
        assertNotNull(result);
        assertTrue(result.length > 0);
    }

    @Test
    @DisplayName("Test sign method with normal request")
    void testSignNormalRequest() {
        SMB1SigningDigest digest = new SMB1SigningDigest(testMacSigningKey, false, 10);
        byte[] data = new byte[100];

        }

        public long getLastHealthCheck() {
            return lastHealthCheck;
        }

        @Override
        public String toString() {
            return String.format("ChannelInfo{id=%s, local=%s, remote=%s, active=%d, healthy=%s}", channelId, localAddress, remoteAddress,
                    activeConnections.get(), isHealthy);
        }
    }

    /**

        int result = request.readRDataWireFormat(src, srcIndex);

        assertEquals(0, result);
    }

    @Test
    void testToString() {
        // Test the toString method's output format
        NameQueryRequest request = new NameQueryRequest(mockConfig, mockName);
        String expectedStringPrefix = "NameQueryRequest[";
        String actualString = request.toString();