if (urlQueue != null && urlQueue.getEncoding() != null) {
            urlEncoding = urlQueue.getEncoding();
        } else {
            urlEncoding = responseData.getCharSet();
        }

        // cid
        final String configId = crawlingConfig.getConfigId();
        if (configId != null) {

   * {@code get(null)}, {@code keySet().contains(null)} or {@code remove(null)}.
   */
  ALLOWS_NULL_KEY_QUERIES,
  ALLOWS_NULL_KEYS(ALLOWS_NULL_KEY_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code
   * containsValue(null)}, {@code values().contains(null)} or {@code values().remove(null)}.
   */
  ALLOWS_NULL_VALUE_QUERIES,

     *
     * @return the results of the search.
     */
    public DockerAvailability getDockerAvailability() {
        if (this.dockerAvailability == null) {
            String dockerPath = null;
            Result lastResult = null;
            Version version = null;
            boolean isVersionHighEnough = false;
            boolean isComposeAvailable = false;

            // Check if the Docker binary exists

    }

    // Edge / invalid: null referral or empty/blank path
    @Test
    @DisplayName("handleDFSReferral handles null referral and empty path")
    void handleDfsReferralNullAndEmpty() {
        when(locator.handleDFSReferral(null, "")).thenReturn("smb://server/share/");
        assertEquals("smb://server/share/", locator.handleDFSReferral(null, ""));
        verify(locator).handleDFSReferral(null, "");

        IndexUpdateCallback callback = new TestIndexUpdateCallback();

        // Execute with null config
        dataStore.store(null, callback, params);

        assertTrue(storeCalled.get());
    }

    @Test
    public void test_store_withNullCallback() {
        // Test store with null callback
        final AtomicBoolean storeCalled = new AtomicBoolean(false);

        dataStore = new DataStore() {

    if (initialCapacity != null) {
      builder.initialCapacity(initialCapacity);
    }
    if (maximumSize != null) {
      builder.maximumSize(maximumSize);
    }
    if (maximumWeight != null) {
      builder.maximumWeight(maximumWeight);
    }
    if (concurrencyLevel != null) {
      builder.concurrencyLevel(concurrencyLevel);
    }

    if (initialCapacity != null) {
      builder.initialCapacity(initialCapacity);
    }
    if (maximumSize != null) {
      builder.maximumSize(maximumSize);
    }
    if (maximumWeight != null) {
      builder.maximumWeight(maximumWeight);
    }
    if (concurrencyLevel != null) {
      builder.concurrencyLevel(concurrencyLevel);
    }

        assertNull(exception.getCause());
        assertNull(exception.getMessage());
        assertTrue(exception instanceof FessSystemException);
    }

    @Test
    public void test_constructorWithNullMessageAndCause() {
        // Test constructor with null message and null cause
        SearchQueryException exception = new SearchQueryException(null, null);

        assertNull(exception.getMessage());

        // Test with null values
        result = jobExecutor.execute(null, "script");
        assertEquals("Executed: null script", result);

        result = jobExecutor.execute("type", null);
        assertEquals("Executed: type null", result);

        result = jobExecutor.execute(null, null);
        assertEquals("Executed: null null", result);

        // Test with empty strings

    protected final ColumnInfo _columnPath = cci("path", "path", null, null, String.class, "path", null, false, false, false, "keyword", 0,
            0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnTarget = cci("target", "target", null, null, String.class, "target", null, false, false, false,