List<Plugin> plugins = (List<Plugin>) pom.getValue("build/plugins");
        for (Plugin plugin : plugins) {
            actual.add(plugin.getArtifactId());
        }

        actual.retainAll(expected);

        assertEquals(actual, expected);
    }

    /** MNG-4416 */
    @Test
    void testPluginOrderAfterMergingWithInjectedPlugins() throws Exception {

   * @param elementsToRetain the elements to retain
   * @return {@code true} if any element was removed from {@code iterator}
   */
  @CanIgnoreReturnValue
  public static boolean retainAll(Iterator<?> removeFrom, Collection<?> elementsToRetain) {
    checkNotNull(elementsToRetain);
    boolean result = false;
    while (removeFrom.hasNext()) {
      if (!elementsToRetain.contains(removeFrom.next())) {

    try {
      values.removeAll(Collections.singleton("four"));
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      values.retainAll(Collections.singleton("four"));
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      Iterator<String> iterator = values.iterator();

    try {
      values.removeAll(Collections.singleton("four"));
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      values.retainAll(Collections.singleton("four"));
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      Iterator<String> iterator = values.iterator();

	if !ok {
		tillStr, ok = meta[AmzObjectLockRetainUntilDate]
	}
	if ok {
		if t, e := amztime.ISO8601Parse(tillStr); e == nil {
			retainTill = RetentionDate{t.UTC()}
		}
	}
	return ObjectRetention{XMLNS: "http://s3.amazonaws.com/doc/2006-03-01/", Mode: mode, RetainUntilDate: retainTill}
}

// GetObjectLegalHoldMeta constructs ObjectLegalHold from metadata
func GetObjectLegalHoldMeta(meta map[string]string) ObjectLegalHold {