LibTest/core/Map/putIfAbsent_A01_t08.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 V putIfAbsent(K key, V ifAbsent())
/// If [key] is not associated to a value, calls [ifAbsent] and
/// updates the map by mapping [key] to the value returned by [ifAbsent].
/// Returns the value in the map.
/// @description Checks that isAbsent is indeed called before putting the new key 
/// in the map if it's not already associated to a value, resulting in a
/// NoSuchMethodError (Type error in checked mode) or NoSuchMethodError if the
/// argument is null or can't be called like a function (according to general
/// language rules).
/// @author msyabro

library putIfAbsent_A01_t08;

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

test(Map create([Map content])) {
  dynamic map = create();

  Expect.throws(() {map.putIfAbsent("1", 1);});
      
  Expect.throws(() {map.putIfAbsent("1", null);});
  Expect.isFalse(map.containsKey("1"));
}