LibTest/collection/UnmodifiableListView/getRange_A01_t01.dart

// Copyright (c) 2017, 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 Iterable<E> getRange(int start, int end)
/// Returns an [Iterable] that iterates over the elements in the range [start] to
/// [end] exclusive.
/// @description Checks result lists with valid ranges.
/// @author iarkh@unipro.ru

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

void check(List src, int start, int length) {
  UnmodifiableListView a = new UnmodifiableListView(src);
  Iterator dst = a.getRange(start, start + length).iterator;
  for(int i = 0; dst.moveNext(); i++) {
    Expect.equals(a[i + start], dst.current);
    Expect.identical(a[i + start], dst.current);
  }
}

main() {

  List l = [1, 189, -14, null, 12345];
  check(l, 0, 5);
  check(l, 0, 1);
  check(l, 1, 3);
  check(l, 3, 1);

  l = new List.filled(100, 0);
  for (var i = 0; i < l.length; i++){
    l[i] = i;
  }
  check(l, 0, 100);
  check(l, 0, 1);
  check(l, 99, 1);
  check(l, 90, 9);
}