// Act & Assert
        // unwrap to interface itself should return same instance
        CredentialsInternal unwrapped = creds.unwrap(CredentialsInternal.class);
        assertNotNull(unwrapped, "unwrap to CredentialsInternal returns instance");
        assertSame(creds, unwrapped, "unwrap returns the same object instance");

        // unwrap to unrelated type should return null (use another Credentials implementation)

     *
     * @return the threshold
     */
    public int threshold() {
        return threshold;
    }

    /**
     * Returns the HTTP method for the request.
     *
     * @return the method
     */
    public Method method() {
        return method;
    }

    /**
     * Returns the body content of the request.
     *
     * @return the body
     */

    }
  }

  /**
   * Returns the size of this source in chars, if the size can be easily determined without actually
   * opening the data stream.
   *
   * <p>The default implementation returns {@link Optional#absent}. Some sources, such as a {@code
   * CharSequence}, may return a non-absent value. Note that in such cases, it is <i>possible</i>

    }
  }

  /**
   * Returns the size of this source in chars, if the size can be easily determined without actually
   * opening the data stream.
   *
   * <p>The default implementation returns {@link Optional#absent}. Some sources, such as a {@code
   * CharSequence}, may return a non-absent value. Note that in such cases, it is <i>possible</i>

        try {
            return new ZipFile(file);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * Creates and returns a <code>ZipFile</code> for reading the specified file.
     *
     * @param file
     *            File. Must not be {@literal null}.
     * @return A <code>ZipFile</code> for reading the specified file.
     */

            Files.delete(file.toPath());
        }
    }

    /**
     * Returns an InputStream to read the content from the cache.
     * If the content is stored in a file, a FileInputStream is returned.
     * Otherwise, a ByteArrayInputStream is returned to read the data from memory.
     *
     * @return an InputStream to read the cached content

      Iterable<T> removeFrom, Predicate<? super T> predicate) {
    if (removeFrom instanceof Collection) {
      return ((Collection<T>) removeFrom).removeIf(predicate);
    }
    return Iterators.removeIf(removeFrom.iterator(), predicate);
  }

  /** Removes and returns the first matching element, or returns {@code null} if there is none. */
  static <T extends @Nullable Object> @Nullable T removeFirstMatching(

        }
    }

    public void test_name() {
        // Test name() method returns correct string representation
        assertEquals("METADATA", SsoResponseType.METADATA.name());
        assertEquals("LOGOUT", SsoResponseType.LOGOUT.name());
    }

    public void test_ordinal() {
        // Test ordinal() method returns correct position
        assertEquals(0, SsoResponseType.METADATA.ordinal());

        }

        return ImmutableList.of();
      };

  /**
   * Returns a predicate that returns the result of {@link File#isDirectory} on input files.
   *
   * @since 15.0
   */
  public static Predicate<File> isDirectory() {
    return FilePredicate.IS_DIRECTORY;
  }

  /**
   * Returns a predicate that returns the result of {@link File#isFile} on input files.
   *
   * @since 15.0
   */

	if s3Err != ErrNone {
		return cred, s3Err
	}
	policy := formValues.Get("Policy")
	signature := formValues.Get(xhttp.AmzSignatureV2)
	if !compareSignatureV2(signature, calculateSignatureV2(policy, cred.SecretKey)) {
		return cred, ErrSignatureDoesNotMatch
	}
	return cred, ErrNone
}

// Escape encodedQuery string into unescaped list of query params, returns error
// if any while unescaping the values.