for (Object element : elements) {
        @SuppressWarnings("unchecked")
        Entry<String, Integer> entry = (Entry<String, Integer>) element;
        multimap.put(entry.getKey(), entry.getValue());
      }
      return multimap.entries();
    }

    abstract Multimap<String, Integer> createMultimap();

    @Override
    @SuppressWarnings("unchecked")

            final String key = e.getKey();
            String value = e.getValue();
            for (final Map.Entry<String, String> entry : paramEnvMap.entrySet()) {
                value = value.replace("${" + entry.getKey() + "}", entry.getValue());
            }
            return new Pair<>(key, value);

    for (K key : sampleKeys()) {
      List<V> expectedValues = new ArrayList<>();
      for (Entry<K, V> entry : getSampleElements()) {
        if (entry.getKey().equals(key)) {
          expectedValues.add(entry.getValue());
        }
      }

      Collection<V> collection = multimap().asMap().get(key);
      if (expectedValues.isEmpty()) {
        assertNull(collection);
      } else {

     *
     * <p><b>NOTE:</b> The object-graph nagivation actually takes place via the
     * {@link ReflectionValueExtractor} class.</p>
     */
    public Object getValue(String expression) {
        if (expression == null || expression.trim().isEmpty()) {
            return null;
        }

        try {
            return ReflectionValueExtractor.evaluate(expression, root, false);

        try {
            List<String> list;
            csvReader.readValues(); // ignore header
            while ((list = csvReader.readValues()) != null) {
                String targetWord = getValue(list, 0);
                if (StringUtil.isBlank(targetWord)) {
                    // skip
                    continue;
                }
                try {
                    boolean isDelete = false;

    for (Entry<String, String> entry : TEST_STRINGS.entrySet()) {
      if (testAsByteSource) {
        suite.addTest(
            suiteForBytes(factory, entry.getValue().getBytes(UTF_8), name, entry.getKey(), true));
      } else {
        suite.addTest(suiteForString(factory, entry.getValue(), name, entry.getKey()));
      }
    }
    return suite;
  }

  static TestSuite suiteForBytes(

        return convertEmptyToNull(key);
    }

    public void setKey(String value) {
        registerModifiedProperty("key");
        this.key = value;
    }

    public String getValue() {
        checkSpecifiedProperty("value");
        return convertEmptyToNull(value);
    }

    public void setValue(String value) {
        registerModifiedProperty("value");
        this.value = value;

            }, (builder, hit) -> {
                try {
                    final Map<String, Object> doc = hit.getSourceAsMap();
                    final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
                    if (StringUtil.isNotBlank(url)) {
                        final Set<String> labelSet = labelTypeHelper.getMatchedLabelValueSet(url);

                    storeChildUrlsToQueue(urlQueue, getChildUrlSet(searchEngineClient, id));
                    return true;
                }

                final Date expires = DocumentUtil.getValue(document, fessConfig.getIndexFieldExpires(), Date.class);
                if (expires != null && expires.getTime() < systemHelper.getCurrentTimeAsLong()) {

  }

  private String expectedToString(Set<Entry<K, V>> entries) {
    Map<K, V> reference = new LinkedHashMap<>();
    for (Entry<K, V> entry : entries) {
      reference.put(entry.getKey(), entry.getValue());
    }
    return reference.toString();
  }