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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
goog.provide('goog.structs.QueueTest');
goog.setTestOnly('goog.structs.QueueTest');
goog.require('goog.structs.Queue');
goog.require('goog.testing.jsunit');
function stringifyQueue(q) {
var values = q.getValues();
var s = '';
for (var i = 0; i < values.length; i++) {
s += values[i];
}
return s;
}
function createQueue() {
var q = new goog.structs.Queue();
q.enqueue('a');
q.enqueue('b');
q.enqueue('c');
q.enqueue('a');
q.dequeue();
q.enqueue('b');
q.enqueue('c');
// q is now: bcabc
return q;
}
function testConstructor() {
var q = new goog.structs.Queue();
assertTrue('testConstructor(), queue should be empty initially', q.isEmpty());
assertEquals('testConstructor(), count should be 0', q.getCount(), 0);
assertEquals(
'testConstructor(), head element should be undefined', q.peek(),
undefined);
}
function testCount() {
var q = createQueue();
assertEquals('testCount(), count should be 5', q.getCount(), 5);
q.enqueue('d');
assertEquals('testCount(), count should be 6', q.getCount(), 6);
q.dequeue();
assertEquals('testCount(), count should be 5', q.getCount(), 5);
q.clear();
assertEquals('testCount(), count should be 0', q.getCount(), 0);
}
function testEnqueue() {
var q = new goog.structs.Queue();
q.enqueue('a');
assertEquals('testEnqueue(), count should be 1', q.getCount(), 1);
q.enqueue('b');
assertEquals('testEnqueue(), count should be 2', q.getCount(), 2);
assertEquals('testEnqueue(), head element should be a', q.peek(), 'a');
q.dequeue();
assertEquals('testEnqueue(), count should be 1', q.getCount(), 1);
assertEquals('testEnqueue(), head element should be b', q.peek(), 'b');
}
function testDequeue() {
var q = createQueue();
assertEquals('testDequeue(), should return b', q.dequeue(), 'b');
assertEquals('testDequeue(), should return b', q.dequeue(), 'c');
assertEquals('testDequeue(), should return b', q.dequeue(), 'a');
assertEquals('testDequeue(), should return b', q.dequeue(), 'b');
assertEquals('testDequeue(), should return b', q.dequeue(), 'c');
assertTrue('testDequeue(), queue should be empty', q.isEmpty());
assertEquals(
'testDequeue(), should return undefined for empty queue', q.dequeue(),
undefined);
}
function testPeek() {
var q = createQueue();
assertEquals('testPeek(), should return b', q.peek(), 'b');
assertEquals(
'testPeek(), dequeue should return peek() result', q.dequeue(), 'b');
assertEquals('testPeek(), should return b', q.peek(), 'c');
q.clear();
assertEquals(
'testPeek(), should return undefined for empty queue', q.peek(),
undefined);
}
function testClear() {
var q = createQueue();
q.clear();
assertTrue('testClear(), queue should be empty', q.isEmpty());
}
function testQueue() {
var q = createQueue();
assertEquals(
'testQueue(), contents must be bcabc', stringifyQueue(q), 'bcabc');
}
function testRemove() {
var q = createQueue();
assertEquals(
'testRemove(), contents must be bcabc', stringifyQueue(q), 'bcabc');
q.dequeue();
assertEquals(
'testRemove(), contents must be cabc', stringifyQueue(q), 'cabc');
q.enqueue('a');
assertEquals(
'testRemove(), contents must be cabca', stringifyQueue(q), 'cabca');
assertTrue('testRemove(), remove should have returned true', q.remove('c'));
assertEquals(
'testRemove(), contents must be abca', stringifyQueue(q), 'abca');
assertTrue('testRemove(), remove should have returned true', q.remove('b'));
assertEquals('testRemove(), contents must be aca', stringifyQueue(q), 'aca');
assertFalse('testRemove(), remove should have returned false', q.remove('b'));
assertEquals('testRemove(), contents must be aca', stringifyQueue(q), 'aca');
assertTrue('testRemove(), remove should have returned true', q.remove('a'));
assertEquals('testRemove(), contents must be ca', stringifyQueue(q), 'ca');
assertTrue('testRemove(), remove should have returned true', q.remove('a'));
assertEquals('testRemove(), contents must be c', stringifyQueue(q), 'c');
assertTrue('testRemove(), remove should have returned true', q.remove('c'));
assertEquals('testRemove(), contents must be empty', stringifyQueue(q), '');
q.enqueue('a');
q.enqueue('b');
q.enqueue('c');
q.enqueue('a');
q.dequeue();
q.enqueue('b');
q.enqueue('c');
assertEquals(
'testRemove(), contents must be bcabc', stringifyQueue(q), 'bcabc');
assertTrue('testRemove(), remove should have returned true', q.remove('c'));
assertEquals(
'testRemove(), contents must be babc', stringifyQueue(q), 'babc');
}
function testContains() {
var q = createQueue();
assertTrue(
'testContains(), contains should have returned true', q.contains('a'));
assertFalse(
'testContains(), contains should have returned false',
q.contains('foobar'));
}
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