LibTest/collection/Maps/putIfAbsent_A01_t10.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 anything thrown by the argument function
 * breaks operation and is passed through to the caller.
 * @author varlax
 * @reviewer msyabro
 */
import "../../../Utils/expect.dart";
import "dart:collection";



main() {
  Object f() {
    throw "Exception!";
  }
  
  Map<String, Object> map = new Map<String, Object>();
  try {
    Maps.putIfAbsent(map, "1", f);
    Expect.fail("This line should not be reached");
  } on String catch(e) {}
  Expect.isTrue(Maps.isEmpty(map));
}