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// 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.
// @dart = 2.9
library queue.test;
import "package:expect/expect.dart";
import 'dart:collection';
abstract class QueueTest {
Queue newQueue();
Queue newQueueFrom(Iterable iterable);
void testMain() {
Queue queue = newQueue();
checkQueue(queue, 0, 0);
queue.addFirst(1);
checkQueue(queue, 1, 1);
queue.addLast(10);
checkQueue(queue, 2, 11);
Expect.equals(10, queue.removeLast());
checkQueue(queue, 1, 1);
queue.addLast(10);
Expect.equals(1, queue.removeFirst());
checkQueue(queue, 1, 10);
queue.addFirst(1);
queue.addLast(100);
queue.addLast(1000);
Expect.equals(1000, queue.removeLast());
queue.addLast(1000);
checkQueue(queue, 4, 1111);
queue.removeFirst();
checkQueue(queue, 3, 1110);
int mapTest(Object value) {
return (value as int) ~/ 10;
}
bool is10(Object value) {
return (value == 10);
}
Queue mapped = newQueueFrom(queue.map(mapTest));
checkQueue(mapped, 3, 111);
checkQueue(queue, 3, 1110);
Expect.equals(1, mapped.removeFirst());
Expect.equals(100, mapped.removeLast());
Expect.equals(10, mapped.removeFirst());
Queue other = newQueueFrom(queue.where(is10));
checkQueue(other, 1, 10);
Expect.equals(true, queue.any(is10));
bool isInstanceOfInt(Object value) {
return (value is int);
}
Expect.equals(true, queue.every(isInstanceOfInt));
Expect.equals(false, queue.every(is10));
bool is1(Object value) {
return (value == 1);
}
Expect.equals(false, queue.any(is1));
queue.clear();
Expect.equals(0, queue.length);
var exception = null;
try {
queue.removeFirst();
} on StateError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(0, queue.length);
exception = null;
try {
queue.removeLast();
} on StateError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(0, queue.length);
queue.addFirst(1);
queue.addFirst(2);
Expect.equals(2, queue.first);
Expect.equals(1, queue.last);
queue.addLast(3);
Expect.equals(3, queue.last);
bool isGreaterThanOne(Object value) {
return ((value as int) > 1);
}
other = newQueueFrom(queue.where(isGreaterThanOne));
checkQueue(other, 2, 5);
// Cycle through values without ever having large element count.
queue = newQueue();
queue.add(0);
for (int i = 0; i < 255; i++) {
queue.add(i + 1);
Expect.equals(i, queue.removeFirst());
}
Expect.equals(255, queue.removeFirst());
Expect.isTrue(queue.isEmpty);
testAddAll();
testLengthChanges();
testLarge();
testFromListToList();
}
void checkQueue(Queue queue, int expectedSize, int expectedSum) {
testLength(expectedSize, queue);
int sum = 0;
void sumElements(Object value) {
sum += value as int;
}
queue.forEach(sumElements);
Expect.equals(expectedSum, sum);
}
testLength(int length, Queue queue) {
Expect.equals(length, queue.length);
((length == 0) ? Expect.isTrue : Expect.isFalse)(queue.isEmpty);
((length != 0) ? Expect.isTrue : Expect.isFalse)(queue.isNotEmpty);
}
void testAddAll() {
Set<int> set = new Set<int>.from([1, 2, 4]);
Expect.equals(3, set.length);
Queue queue1 = newQueueFrom(set);
Queue queue2 = newQueue();
Queue queue3 = newQueue();
testLength(3, queue1);
testLength(0, queue2);
testLength(0, queue3);
queue2.addAll(set);
testLength(3, queue2);
queue3.addAll(queue1);
testLength(3, queue3);
int sum = 0;
void f(e) {
sum += e;
}
;
set.forEach(f);
Expect.equals(7, sum);
sum = 0;
queue1.forEach(f);
Expect.equals(7, sum);
sum = 0;
queue2.forEach(f);
Expect.equals(7, sum);
sum = 0;
queue3.forEach(f);
Expect.equals(7, sum);
sum = 0;
set = new Set<int>.from([]);
queue1 = newQueueFrom(set);
queue2 = newQueue();
queue3 = newQueue();
queue2.addAll(set);
queue3.addAll(queue1);
Expect.equals(0, set.length);
Expect.equals(0, queue1.length);
Expect.equals(0, queue2.length);
Expect.equals(0, queue3.length);
}
void testLengthChanges() {
// Test that the length property is updated properly by
// modifications;
Queue queue = newQueue();
testLength(0, queue);
for (int i = 1; i <= 10; i++) {
queue.add(i);
testLength(i, queue);
}
for (int i = 1; i <= 10; i++) {
queue.addFirst(11 - i);
testLength(10 + i, queue);
}
for (int i = 1; i <= 10; i++) {
queue.addLast(i);
testLength(20 + i, queue);
}
queue.addAll([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
testLength(40, queue);
for (int i = 1; i <= 5; i++) {
Expect.equals(i, queue.removeFirst());
testLength(40 - i, queue);
}
for (int i = 1; i <= 5; i++) {
Expect.equals(11 - i, queue.removeLast());
testLength(35 - i, queue);
}
Expect.isTrue(queue.remove(10));
testLength(29, queue);
Expect.isFalse(queue.remove(999));
testLength(29, queue);
queue.removeWhere((x) => x == 7);
testLength(26, queue);
queue.retainWhere((x) => x != 3);
testLength(23, queue);
Expect.listEquals(
[6, 8, 9, 1, 2, 4, 5, 6, 8, 9, 10, 1, 2, 4, 5, 6, 8, 9, 10, 1, 2, 4, 5],
queue.toList());
// Regression test: http://dartbug.com/16270
// These should all do nothing, and should not throw.
Queue emptyQueue = newQueue();
emptyQueue.remove(0);
emptyQueue.removeWhere((x) => null);
emptyQueue.retainWhere((x) => null);
}
void testLarge() {
int N = 10000;
Set set = new Set();
Queue queue = newQueue();
Expect.isTrue(queue.isEmpty);
for (int i = 0; i < N; i++) {
queue.add(i);
set.add(i);
}
Expect.equals(N, queue.length);
Expect.isFalse(queue.isEmpty);
Expect.equals(0, queue.elementAt(0));
Expect.equals(N - 1, queue.elementAt(N - 1));
Expect.throws(() {
queue.elementAt(-1);
});
Expect.throws(() {
queue.elementAt(N);
});
Iterable skip1 = queue.skip(1);
Iterable take1 = queue.take(1);
Iterable mapped = queue.map((e) => -e);
for (int i = 0; i < 500; i++) {
Expect.equals(i, take1.first);
Expect.equals(i, queue.first);
Expect.equals(-i, mapped.first);
Expect.equals(i + 1, skip1.first);
Expect.equals(i, queue.removeFirst());
Expect.equals(i + 1, take1.first);
Expect.equals(-i - 1, mapped.first);
Expect.equals(N - 1 - i, queue.last);
Expect.equals(N - 1 - i, queue.removeLast());
}
Expect.equals(N - 1000, queue.length);
Expect.isTrue(queue.remove(N >> 1));
Expect.equals(N - 1001, queue.length);
queue.clear();
Expect.equals(0, queue.length);
Expect.isTrue(queue.isEmpty);
queue.addAll(set);
Expect.equals(N, queue.length);
Expect.isFalse(queue.isEmpty);
// Iterate.
for (var element in queue) {
Expect.isTrue(set.contains(element));
}
queue.forEach((element) {
Expect.isTrue(set.contains(element));
});
queue.addAll(set);
Expect.equals(N * 2, queue.length);
Expect.isFalse(queue.isEmpty);
queue.clear();
Expect.equals(0, queue.length);
Expect.isTrue(queue.isEmpty);
}
void testFromListToList() {
const int N = 256;
List list = [];
for (int i = 0; i < N; i++) {
Queue queue = newQueueFrom(list);
Expect.equals(list.length, queue.length);
List to = queue.toList();
Expect.listEquals(list, to);
queue.add(i);
list.add(i);
Expect.equals(list.length, queue.length);
to = queue.toList();
Expect.listEquals(list, to);
}
}
}
class ListQueueTest extends QueueTest {
Queue newQueue() => new ListQueue();
Queue newQueueFrom(Iterable elements) => new ListQueue.from(elements);
void testMain() {
super.testMain();
trickyTest();
}
void trickyTest() {
// Test behavior around the know growing capacities of a ListQueue.
Queue q = new ListQueue();
for (int i = 0; i < 255; i++) {
q.add(i);
}
for (int i = 0; i < 128; i++) {
Expect.equals(i, q.removeFirst());
}
q.add(255);
for (int i = 0; i < 127; i++) {
q.add(i);
}
Expect.equals(255, q.length);
// Remove element at end of internal buffer.
q.removeWhere((v) => v == 255);
// Remove element at beginning of internal buffer.
q.removeWhere((v) => v == 0);
// Remove element at both ends of internal buffer.
q.removeWhere((v) => v == 254 || v == 1);
Expect.equals(251, q.length);
Iterable i255 = new Iterable.generate(255, (x) => x);
q = new ListQueue();
q.addAll(i255);
Expect.listEquals(i255.toList(), q.toList());
q = new ListQueue();
q.addAll(i255.toList());
Expect.listEquals(i255.toList(), q.toList());
q = new ListQueue.from(i255);
for (int i = 0; i < 128; i++) q.removeFirst();
q.add(256);
q.add(0);
q.addAll(i255.toList());
Expect.equals(129 + 255, q.length);
// Test addAll that requires the queue to grow.
q = new ListQueue();
q.addAll(i255.take(35));
q.addAll(i255.skip(35).take(96));
q.addAll(i255.skip(35 + 96));
Expect.listEquals(i255.toList(), q.toList());
}
}
class DoubleLinkedQueueTest extends QueueTest {
Queue newQueue() => new DoubleLinkedQueue();
Queue newQueueFrom(Iterable elements) => new DoubleLinkedQueue.from(elements);
void testMain() {
super.testMain();
testQueueElements();
}
void testQueueElements() {
DoubleLinkedQueue<int> queue1 = new DoubleLinkedQueue<int>.from([1, 2, 3]);
DoubleLinkedQueue<int> queue2 = new DoubleLinkedQueue<int>();
queue2.addAll(queue1);
Expect.equals(queue1.length, queue2.length);
DoubleLinkedQueueEntry<int> entry1 = queue1.firstEntry();
DoubleLinkedQueueEntry<int> entry2 = queue2.firstEntry();
while (entry1 != null) {
Expect.equals(true, !identical(entry1, entry2));
entry1 = entry1.nextEntry();
entry2 = entry2.nextEntry();
}
Expect.equals(null, entry2);
var firstEntry = queue1.firstEntry();
var secondEntry = queue1.firstEntry().nextEntry();
var thirdEntry = queue1.lastEntry();
firstEntry.prepend(4);
firstEntry.append(5);
secondEntry.prepend(6);
secondEntry.append(7);
thirdEntry.prepend(8);
thirdEntry.append(9);
Expect.equals(9, queue1.length);
Expect.listEquals(queue1.toList(), [4, 1, 5, 6, 2, 7, 8, 3, 9]);
Expect.equals(1, firstEntry.remove());
Expect.equals(2, secondEntry.remove());
Expect.equals(3, thirdEntry.remove());
Expect.equals(6, queue1.length);
Expect.listEquals(queue1.toList(), [4, 5, 6, 7, 8, 9]);
}
}
void linkEntryTest() {
var entry = new DoubleLinkedQueueEntry(42);
Expect.equals(null, entry.previousEntry());
Expect.equals(null, entry.nextEntry());
entry.append(37);
entry.prepend(87);
var prev = entry.previousEntry();
var next = entry.nextEntry();
Expect.equals(42, entry.element);
Expect.equals(37, next.element);
Expect.equals(87, prev.element);
Expect.identical(entry, prev.nextEntry());
Expect.identical(entry, next.previousEntry());
Expect.equals(null, next.nextEntry());
Expect.equals(null, prev.previousEntry());
entry.element = 117;
Expect.equals(117, entry.element);
Expect.identical(next, entry.nextEntry());
Expect.identical(prev, entry.previousEntry());
Expect.equals(117, entry.remove());
Expect.identical(next, prev.nextEntry());
Expect.identical(prev, next.previousEntry());
Expect.equals(null, next.nextEntry());
Expect.equals(null, prev.previousEntry());
Expect.equals(37, next.element);
Expect.equals(87, prev.element);
Expect.equals(37, next.remove());
Expect.equals(87, prev.element);
Expect.equals(null, prev.nextEntry());
Expect.equals(null, prev.previousEntry());
Expect.equals(87, prev.remove());
}
main() {
new DoubleLinkedQueueTest().testMain();
new ListQueueTest().testMain();
linkEntryTest();
}