Helpers.assertEqualIgnoringOrder(
          getSampleElements(), Arrays.asList(collection.stream().toArray()));
    }
  }

  @CollectionFeature.Require(KNOWN_ORDER)
  public void testStreamToArrayKnownOrder() {
    synchronized (collection) { // to allow Collections.synchronized* tests to pass
      assertEquals(getOrderedElements(), Arrays.asList(collection.stream().toArray()));
    }
  }