* @return The environment for LDAP connection.
     */
    protected Hashtable<String, String> createEnvironment(final String initialContextFactory, final String securityAuthentication,
            final String providerUrl, final String principal, final String credntials) {
        final Hashtable<String, String> env = new Hashtable<>();
        putEnv(env, Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);

            new TestStringMapGenerator() {
              @Override
              // We are testing Hashtable / testing our tests on Hashtable.
              @SuppressWarnings("JdkObsolete")
              protected Map<String, String> create(Entry<String, String>[] entries) {
                return populate(new Hashtable<String, String>(), entries);
              }
            })
        .withFeatures(

  }

  private int findEntry(
      @Nullable Object o,
      int oHash,
      int[] hashTable,
      int[] nextInBucket,
      @Nullable Object[] array) {
    for (int entry = hashTable[bucket(oHash)]; entry != ABSENT; entry = nextInBucket[entry]) {
      if (Objects.equals(array[entry], o)) {
        return entry;
      }
    }
    return ABSENT;