LibTest/typed_data/Int32x4List/retainWhere_A01_t01.dart

/*
 * Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion void retainWhere(bool test(E element))
 * Removes all objects from this list that fail to satisfy test.
 * ...
 * An UnsupportedError occurs if the list is fixed-length.
 * @description Checks that an UnsupportedError is thrown as Int32x4List is
 * fixed-length.
 * @author ngl@unipro.ru
 */

import "dart:typed_data";
import "../../../Utils/expect.dart";

Int32x4 i32x4(n) => new Int32x4(n, n, n, n);

main() {
  var list = [i32x4(0), i32x4(1), i32x4(2), i32x4(3)];
  var l = new Int32x4List.fromList(list);
  Expect.throws(
          () { l.retainWhere((e) => e.x == 4); }, (e) => e is UnsupportedError);
  Expect.equals(list.length, l.length);

  Expect.throws(
          () { l.retainWhere((e) => e.x < 2); }, (e) => e is UnsupportedError);
  Expect.equals(list.length, l.length);

  l = new Int32x4List(0);
  Expect.throws(
          () { l.retainWhere((e) => false); }, (e) => e is UnsupportedError);
  Expect.equals(0, l.length);
}