LibTest/collection/Queue/remove_A01_t01.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.
 */
/**
 * @assertion  abstract bool remove(Object object)
 * Remove a single instance of value from the queue.
 * Returns true if a value was removed, or false if the queue contains no
 * element equal to value.
 * @description Checks that the method returns true if a value was removed,
 * or false if the queue contains no element equal to value.
 * @author kaigorodov
 */
library remove_A01_t01;
import "dart:collection";
import "../../../Utils/expect.dart";

test(Queue create([Iterable content])) {

  check(Iterable a, Object value, bool expected) {
    Queue queue = create(a);
    var l1 = queue.length;
    bool r = queue.remove(value);
    Expect.isTrue(r is bool, "remove returned: ${r.runtimeType} ${r}, not bool");
    Expect.equals(expected, r);
    if (r) {
      Expect.equals(l1 - 1, queue.length);
    } else {
      Expect.equals(l1, queue.length);
    }
  }

  check([], 1, false);
  check([1], 1, true);
  check([], true, false);
  check([null], 2, false);
  check([null, null, null], null, true);
  check([1, 2, 3, 4, 5, null, 2], 2, true);
}