LibTest/core/List/lastIndexOf_A03_t01.test.dart

// Copyright (c) 2011, 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.

// @dart = 2.9

/// @assertion abstract int lastIndexOf(E element, [int start])
/// There is no restriction on the value of [start]. 
/// If it is negative, it has the same effect as if it were zero: -1 is returned.
/// If it is greater than the [:length:] of this list, it has the same effect 
/// as if it were equal to the [:length:]: this entire list may be searched.
/// @note undocumented
/// @description Checks that [startIndex] can be out of bounds
/// @author iefremov
/// @author varlax

library lastIndexOf_A03_t01;

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

checkList(List list, var elem, int idx, int expected) {
  Expect.equals(expected, list.lastIndexOf(elem, idx));
}

check(List a) {
  checkList(a, 42, -1, -1);
  checkList(a, 777, -1, -1);
  checkList(a, null, -1, -1);
  checkList(a, 0, -1, -1);

  checkList(a, 42, 7, 3);
  checkList(a, 777, 7, -1);
  checkList(a, null, 7, -1);
  checkList(a, 0, 7, 6);

  checkList(a, 42, 6031769, 3);
  checkList(a, 777, 6031769, -1);
  checkList(a, null, 6031769, -1);
  checkList(a, 0, 6031769, 6);

  checkList(a, 42, -6031769, -1);
  checkList(a, 777, -6031769, -1);
  checkList(a, null, -6031769, -1);
  checkList(a, 0, -6031769, -1);
}

test(List create([int length])) {
  List a = create();
  a.addAll(const [42, 0, -1, 42, -1, 6031769, 0]);
  check(a);

  List b = create(a.length);
  b.setRange(0, a.length, a);
  check(b);
}