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iterable_take_test.dart
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// Copyright (c) 2012, 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.
import "package:expect/expect.dart";
main() {
List<int> list1 = <int>[1, 2, 3];
List<int> list2 = const <int>[4, 5];
List<String> list3 = <String>[];
Set<int> set1 = new Set<int>();
set1
..add(11)
..add(12)
..add(13);
Set set2 = new Set();
Iterable<int> take0 = list1.take(0);
Iterator<int> it = take0.iterator;
Expect.isFalse(it.moveNext());
Iterable<int> take1 = list1.take(1);
it = take1.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isFalse(it.moveNext());
Iterable<int> take2 = list1.take(2);
it = take2.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isFalse(it.moveNext());
Iterable<int> take3 = list1.take(3);
it = take3.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(3, it.current);
Expect.isFalse(it.moveNext());
Iterable<int> take4 = list1.take(4);
it = take4.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(3, it.current);
Expect.isFalse(it.moveNext());
take4 = list1.take(4);
take3 = take4.take(3);
take2 = take3.take(2);
take1 = take2.take(1);
take0 = take1.take(0);
it = take0.iterator;
Expect.isFalse(it.moveNext());
it = take1.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isFalse(it.moveNext());
it = take2.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isFalse(it.moveNext());
it = take3.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(3, it.current);
Expect.isFalse(it.moveNext());
it = take4.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(2, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(3, it.current);
Expect.isFalse(it.moveNext());
take0 = list2.take(0);
it = take0.iterator;
Expect.isFalse(it.moveNext());
take1 = list2.take(1);
it = take1.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(4, it.current);
Expect.isFalse(it.moveNext());
take2 = list2.take(2);
it = take2.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(4, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(5, it.current);
Expect.isFalse(it.moveNext());
take3 = list2.take(3);
it = take3.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(4, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(5, it.current);
Expect.isFalse(it.moveNext());
Iterable<String> take02 = list3.take(0);
Iterator<String> it2 = take02.iterator;
Expect.isFalse(it2.moveNext());
Iterable<String> take12 = list3.take(1);
it2 = take12.iterator;
Expect.isFalse(it2.moveNext());
take0 = set1.take(0);
it = take0.iterator;
Expect.isFalse(it.moveNext());
take1 = set1.take(1);
List<int> copied = take1.toList();
Expect.equals(1, copied.length);
Expect.isTrue(set1.contains(copied[0]));
it = take1.iterator;
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isFalse(it.moveNext());
take2 = set1.take(2);
copied = take2.toList();
Expect.equals(2, copied.length);
Expect.isTrue(set1.contains(copied[0]));
Expect.isTrue(set1.contains(copied[1]));
Expect.isTrue(copied[0] != copied[1]);
it = take2.iterator;
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isFalse(it.moveNext());
take3 = set1.take(3);
copied = take3.toList();
Expect.equals(3, copied.length);
Expect.isTrue(set1.contains(copied[0]));
Expect.isTrue(set1.contains(copied[1]));
Expect.isTrue(set1.contains(copied[2]));
Expect.isTrue(copied[0] != copied[1]);
Expect.isTrue(copied[0] != copied[2]);
Expect.isTrue(copied[1] != copied[2]);
it = take3.iterator;
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isTrue(it.moveNext());
Expect.isNotNull(it.current);
Expect.isFalse(it.moveNext());
var dynamicTake0 = set2.take(0);
var dynamicIt = dynamicTake0.iterator;
Expect.isFalse(dynamicIt.moveNext());
var dynamicTake1 = set2.take(1);
dynamicIt = dynamicTake1.iterator;
Expect.isFalse(dynamicIt.moveNext());
Expect.throwsRangeError(() => list1.skip(-1));
Expect.throwsRangeError(() => list2.skip(-1));
Expect.throwsRangeError(() => list3.skip(-1));
Expect.throwsRangeError(() => set1.skip(-1));
Expect.throwsRangeError(() => set2.skip(-1));
Expect.throwsRangeError(() => list1.map((x) => x).skip(-1));
Expect.throwsRangeError(() => list2.map((x) => x).skip(-1));
Expect.throwsRangeError(() => list3.map((x) => x).skip(-1));
Expect.throwsRangeError(() => set1.map((x) => x).skip(-1));
Expect.throwsRangeError(() => set2.map((x) => x).skip(-1));
// Iterable<dynamic>.
var take5 = set2.take(0);
var it3 = take5.iterator;
Expect.isNull(it3.current);
Expect.isFalse(it3.moveNext());
Expect.isNull(it3.current);
take5 = set2.take(1);
it3 = take5.iterator;
Expect.isNull(it3.current);
Expect.isFalse(it3.moveNext());
Expect.isNull(it3.current);
Expect.throws(() => list1.take(-1), (e) => e is RangeError);
Expect.throws(() => list2.take(-1), (e) => e is RangeError);
Expect.throws(() => list3.take(-1), (e) => e is RangeError);
Expect.throws(() => set1.take(-1), (e) => e is RangeError);
Expect.throws(() => set2.take(-1), (e) => e is RangeError);
Expect.throws(() => list1.map((x) => x).take(-1), (e) => e is RangeError);
Expect.throws(() => list2.map((x) => x).take(-1), (e) => e is RangeError);
Expect.throws(() => list3.map((x) => x).take(-1), (e) => e is RangeError);
Expect.throws(() => set1.map((x) => x).take(-1), (e) => e is RangeError);
Expect.throws(() => set2.map((x) => x).take(-1), (e) => e is RangeError);
}