LibTest/collection/Maps/putIfAbsent_A01_t08.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.
 */
/**
 * @assertion dynamic putIfAbsent(Map map, key, ifAbsent())
 * If [key] is not associated to a value, calls [ifAbsent] and
 * updates the map by mapping [key] 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).
 * @static-warning
 * @author msyabro
 * @reviewer varlax
 * @needsreview undocumented
 */
import "../../../Utils/expect.dart";
import "../../../Utils/dynamic_check.dart";
import "dart:collection";

main() {
  Map<String, Object> map = new Map<String, Object>();
      
  Expect.throws(() {
      Maps.putIfAbsent(map, "1", 1); /// static type warning
    }, 
    (e)=>isCheckedMode()?
      (e is TypeError):
      (e is NoSuchMethodError)
    , 
    isCheckedMode()?
      "Type error expected in checked mode":
      "NoSuchMethodError expected in checked mode"
  );

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