@Test
        @DisplayName("Should handle null values in toString")
        void testToStringWithNulls() {
            String result = referralData.toString();

            assertTrue(result.contains("server=null"));
            assertTrue(result.contains("share=null"));
            assertTrue(result.contains("link=null"));
            assertTrue(result.contains("path=null"));
        }
    }

    @Nested

        assertEquals("0.0.0.0", unknownName.getName(), "Unknown name should be 0.0.0.0");
    }

    @Test
    @DisplayName("Should handle null hostname in getByName")
    void testGetByNameWithNull() {
        // When/Then
        assertThrows(UnknownHostException.class, () -> {
            nameServiceClient.getByName(null);

    }

    // Test with null configuration values
    public void test_withNullConfigValues() {
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            private static final long serialVersionUID = 1L;

            @Override
            public String getCookieDefaultPath() {
                return null;
            }

            @Override

    }

    // Edge/invalid inputs: null or empty share/service cause IllegalArgumentException (mocked)
    @ParameterizedTest
    @DisplayName("getSmbTree invalid inputs (null/empty) throw IllegalArgumentException")
    @CsvSource({ ",service", // null share
            " ,service", // empty share
            "share,", // null service
            "share, " // empty service
    })

            final boolean runAll = webConfigIdList == null && fileConfigIdList == null && dataConfigIdList == null;

            Thread webFsCrawlerThread = null;
            Thread dataCrawlerThread = null;

            if (runAll || webConfigIdList != null || fileConfigIdList != null) {
                webFsCrawlerThread = new Thread((Runnable) () -> {
                    // crawl web

        if (featureSetName != null) {
            builder.field(FEATURESET_NAME.getPreferredName(), featureSetName);
        }
        if (storeName != null) {
            builder.field(STORE_NAME.getPreferredName(), storeName);
        }
        if (this.params != null && !this.params.isEmpty()) {
            builder.field(PARAMS.getPreferredName(), this.params);
        }
        if (activeFeatures != null && !activeFeatures.isEmpty()) {

        final DerivationParameters param = new KDFCounterParameters(sessionKey, null /* prefix */, suffix /* suffix */, r /* r */);
        gen.init(param);

        final byte[] derived = new byte[16];
        gen.generateBytes(derived, 0, 16);
        return derived;
    }

    /**
     * @param string
     * @return null terminated ASCII bytes
     */
    private static byte[] toCBytes(final String string) {

        final String msg = request.getHeader("Authorization");
        if (msg != null && (msg.startsWith("NTLM ") || offerBasic && msg.startsWith("Basic "))) {
            if (loadBalance) {
                dc = new UniAddress(NbtAddress.getByName(domainController, 0x1C, null));
            } else {
                dc = UniAddress.getByName(domainController, true);
            }

        } else if (exception instanceof NullPointerException) {
            // Empty input causes null ASN1 object, which is expected behavior
            assertTrue(exception.getMessage() == null || exception.getMessage().contains("Cannot invoke \"Object.getClass()\""),
                    "NullPointerException should be from null ASN1 object.");
        }
    }

    /**

    String stateString = requestUrl.queryParameter("state");
    ByteString state = stateString != null ? ByteString.decodeBase64(stateString) : null;

    Listener listener;
    synchronized (this) {
      listener = listeners.get(state);
    }

    if (code == null || listener == null) {
      return new MockResponse()
          .setResponseCode(404)
          .setBody("unexpected request");
    }