LanguageFeatures/nnbd/weak/list_length_t03.dart

// 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.

/// @assertion Calling the .length setter on a List with element type E with an
/// argument greater than the current length of the list is a runtime error
/// unless Null <: E
/// @description Check that calling the .length setter on a List with element
/// type E with an argument greater than the current length of the list is not a
/// runtime error if E is subtype of Null
/// @author sgrekhov@unipro.ru

// Requirements=nnbd-weak
import "dart:async";
import "../../../Utils/expect.dart";

class A {}
void foo() {}
void bar() {}

typedef void Foo();

test<T>(T t1, T t2) {
  List<T> list = [t1, t2];
  list.length = 3;
  Expect.equals(3, list.length);
}

main() {
  test<Object?>(1, "2");
  test<Null>(null, null);
  test<int?>(3, 14);
  test<String?>("Lily", "was here");
  test<A?>(A(), A());
  test<Function?>(foo, bar);
  test<Foo?>(foo, bar);
  test<FutureOr<A?>>(A(), A());
  test<FutureOr<Foo?>>(foo, bar);
  test<FutureOr<FutureOr<A?>>>(A(), A());
}