LibTest/collection/LinkedList/every_A01_t02.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 bool every(bool f(E element))
 * Returns true if every elements of this collection satisify the predicate f.
 * Returns false otherwise.
 * @description Checks that the predicate method is called for each element until the first false result.
 * @author kaigorodov
 */
import "dart:collection";
import "../../../Utils/expect.dart";
import "LinkedList.lib.dart";

//Checks that [every] calls [predicate] a [count] number of times
check(LinkedList<MyLinkedListEntry> a, bool predicate(var e), int count) {
  int actualCount = 0;
  a.every((MyLinkedListEntry e) {
    actualCount++;
    return predicate(e.value);
  });
  Expect.equals(count, actualCount);
}

bool allTrue(var e)=>true;

bool allFalse(var e)=>false;

bool lessThan3(var e)=> e<3;
  
main() {
  LinkedList<MyLinkedListEntry> a = toLinkedList([1,2,3,4,5]);
  check(a, allTrue, 5);
  check(a, allFalse, 1);
  check(a, lessThan3, 3);
}