/** Returns an immutable copy of this. */
@Suppress("UNCHECKED_CAST")
internal fun <T> List<T>.toImmutableList(): List<T> =
  when {
    this.isEmpty() -> emptyList()
    this.size == 1 -> Collections.singletonList(this[0])
    // Collection.toArray returns Object[] (covariant).
    // It is faster than creating real T[] via reflection (Arrays.copyOf).

        assertEquals("fess_suggest", testBuilder.settingsIndexName);
        assertNotNull(testBuilder.timeoutSettings);
        assertNotNull(testBuilder.initialSettings);
        assertTrue(testBuilder.initialSettings.isEmpty());
    }

    @Test
    public void testSetSettingsIndexName() {
        // Test setting index name with lowercase conversion
        SuggestSettingsBuilder result = builder.setSettingsIndexName("TEST_INDEX");

      nextIndex++;
      current = null;
    }
  }

  // Query Operations

  @Override
  public int size() {
    return size;
  }

  @Override
  public boolean isEmpty() {
    return head == null;
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    return keyToKeyList.containsKey(key);
  }

  @Override

        AuthenticationType t = AuthenticationType.USER;
        if ("guest".equalsIgnoreCase(this.username)) {
            t = AuthenticationType.GUEST;
        } else if ((getUserDomain() == null || getUserDomain().isEmpty()) && getUsername().isEmpty()
                && (this.password == null || this.password.length == 0)) {
            t = AuthenticationType.NULL;
        }
        return t;
    }

    @SuppressWarnings("unchecked")

            // Should not throw
            assertDoesNotThrow(() -> concreteImplementation.replaceCache());

            // Map should remain empty
            assertTrue(cacheMap.isEmpty());
        }

        @Test
        @DisplayName("Should handle replace without map")
        void testReplaceCacheWithoutMap() {
            concreteImplementation.setKey("key");

    List<Object> buf = new ArrayList<>();
    int elements = Queues.drain(q, buf, -1, MAX_VALUE, NANOSECONDS);
    assertEquals(0, elements);
    assertThat(buf).isEmpty();

    // Free the producer thread, and give subsequent tests a clean slate.
    q.take();
  }

  public void testDrain_throws() throws Exception {
    for (BlockingQueue<Object> q : blockingQueues()) {

        assertNotNull(stringRep);
        assertTrue(stringRep.contains("Smb2TransformHeader"));
        // toString() implementation may vary, just check it's not null and not empty
        assertFalse(stringRep.isEmpty());
    }

    @Test
    @DisplayName("Should generate correct associated data for AEAD")
    void testGetAssociatedData() {
        // Given
        transformHeader.setNonce(testNonce);

  final Monitor monitor = new Monitor(true);
  private final Monitor.Guard notEmpty =
      new Monitor.Guard(monitor) {
        @Override
        public boolean isSatisfied() {
          return !q.isEmpty();
        }
      };

  /**
   * Creates a {@code MonitorBasedPriorityBlockingQueue} with the default initial capacity (11) that
   * orders its elements according to their {@linkplain Comparable natural ordering}.

 * {@snippet :
 * final WeakHashMap<Object, Object> map = new WeakHashMap<>();
 * map.put(new Object(), Boolean.TRUE);
 * GcFinalization.awaitDone(new FinalizationPredicate() {
 *   public boolean isDone() {
 *     return map.isEmpty();
 *   }
 * });
 * }
 *
 * <p>Even if your non-test code does not use finalization, you can use this class to test for
 * leaks, by ensuring that objects are no longer strongly referenced:
 *
 * {@snippet :

        // Test with empty environment
        Hashtable<String, String> emptyEnv = new Hashtable<>();
        LdapUser user = new LdapUser(emptyEnv, "user");
        assertTrue(user.getEnvironment().isEmpty());
    }

    public void test_getPermissions_withoutLdapConfig() {
        // Test when baseDn or accountFilter is blank
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            @Override