Map<Integer, KerberosKey> keys = new HashMap<>();

        // 2. WHEN & 3. THEN
        // When ASN1InputStream.readObject() returns null due to empty input,
        // ASN1Util.as() throws NullPointerException (not wrapped)
        Exception exception = assertThrows(Exception.class, () -> {
            new KerberosRelevantAuthData(emptyToken, keys);
        }, "An exception should be thrown for an empty token.");

    //                                                                           =========
    /**
     * Gets the login manager for this admin action.
     *
     * @return the login manager wrapped in OptionalThing
     */
    @Override
    protected OptionalThing<LoginManager> myLoginManager() {
        return OptionalThing.of(fessLoginAssist);
    }

     * Instance a <code>SpnegoContext</code> object by wrapping a {@link SSPContext}
     * with the same mechanism this {@link SSPContext} used.
     *
     * @param source
     *            the {@link SSPContext} to be wrapped
     */
    SpnegoContext(final Configuration config, final SSPContext source) {
        this(config, source, source.getSupportedMechs());
    }

    /**

    /**
     * A resolver for login credentials that wraps the standard credential resolver
     * to provide SSO authentication support.
     */
    public static class LoginCredentialResolver {
        /** The wrapped credential resolver. */
        private final TypicalLoginAssist<String, FessUserBean, FessUser>.CredentialResolver resolver;

        /**
         * Creates a new login credential resolver.
         *

    val buffer = Buffer()
    val writer = DerWriter(buffer)
    toDer(writer, value)
    return buffer.readByteString()
  }

  /**
   * Returns an adapter that expects this value wrapped by another value. Typically this occurs
   * when a value has both a context or application tag and a universal tag.
   *
   * Use this for EXPLICIT tag types:
   *
   * ```
   * [5] EXPLICIT UTF8String
   * ```

  /**
   * Converts the given {@code ListenableFuture} to an equivalent {@code FluentFuture}.
   *
   * <p>If the given {@code ListenableFuture} is already a {@code FluentFuture}, it is returned
   * directly. If not, it is wrapped in a {@code FluentFuture} that delegates all calls to the
   * original {@code ListenableFuture}.
   */
  public static <V extends @Nullable Object> FluentFuture<V> from(ListenableFuture<V> future) {

 * </p>
 * <p>
 * Any {@link IOException} thrown by these methods is wrapped and thrown as an {@link IORuntimeException}.
 * </p>
 *
 * @author koichik
 */
public abstract class CopyUtil {

    /**
     * Do not instantiate.
     */
    protected CopyUtil() {
    }

    }

    /**
     * Retrieves the character mapping file for the specified dictionary ID.
     * <p>
     * This method looks up the dictionary file and ensures it is a character mapping file
     * before returning it wrapped in an OptionalEntity.
     * </p>
     *
     * @param dictId the dictionary ID to retrieve the character mapping file for
     * @return an OptionalEntity containing the character mapping file if found and valid, empty otherwise

   *
   * <p>Failure to follow this advice may result in non-deterministic behavior.
   *
   * <p>The returned queue will be serializable if the specified queue is serializable.
   *
   * @param queue the queue to be wrapped in a synchronized view
   * @return a synchronized view of the specified queue
   * @since 14.0
   */
  @J2ktIncompatible // Synchronized

		{
			[]error{
				errFileNotFound, errFileNotFound, errFileNotFound,
				errFileNotFound, errFileNotFound, nil, nil, nil, nil, nil,
			},
			nil, nil,
		},
		// Checks if wrapped context cancellation errors are grouped as one.
		{canceledErrs, nil, context.Canceled},
	}
	// Validates list of all the testcases for returning valid errors.
	for i, testCase := range testCases {