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// Copyright (c) 2020, 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.
import "dart:collection";
import "package:expect/expect.dart";
import 'cast_helper.dart';
void main() {
testDowncast();
testUpcast();
testRegression();
}
void testDowncast() {
var list = new List<C>.from(elements);
var dList = List.castFrom<C, D>(list);
Expect.throws(() => dList.first); // C is not D.
Expect.equals(d, dList[1]);
Expect.throws(() => dList[2]); // E is not D.
Expect.equals(f, dList[3]);
Expect.equals(null, dList.last);
Expect.throws(() => dList.toList());
// Setting works.
dList[2] = d;
Expect.equals(d, dList[2]);
}
void testUpcast() {
var list2 = new List<C>.from(elements);
var dList2 = List.castFrom<C, Object>(list2);
Expect.listEquals(elements, dList2);
Expect.throws(() => dList2[2] = new Object()); // Cannot set non-C.
Expect.listEquals(elements, dList2);
}
void testRegression() {
var numList = <num>[4, 3, 2, 1];
var intList = numList.cast<int>();
intList.sort(null);
Expect.listEquals([1, 2, 3, 4], numList);
Expect.listEquals([1, 2, 3, 4], intList);
}