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Java > Open Source Codes > org > archive > queue > QueueTestBase


1 /* QueueTestBase
2  *
3  * $Id: QueueTestBase.java,v 1.1.24.1 2007/01/13 01:31:39 stack-sf Exp $
4  *
5  * Created Tue Jan 20 14:17:59 PST 2004
6  *
7  * Copyright (C) 2004 Internet Archive.
8  *
9  * This file is part of the Heritrix web crawler (crawler.archive.org).
10  *
11  * Heritrix is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU Lesser Public License as published by
13  * the Free Software Foundation; either version 2.1 of the License, or
14  * any later version.
15  *
16  * Heritrix is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Lesser Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser Public License
22  * along with Heritrix; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24  */
25
26 package org.archive.queue;
27
28 import java.util.NoSuchElementException JavaDoc;
29
30 import org.archive.util.TmpDirTestCase;
31
32 /**
33  * JUnit test suite for Queue. It's an abstract class which is implemented by
34  * each queue implementation
35  *
36  * @author <a HREF="mailto:me@jamesc.net">James Casey</a>
37  * @version $Id: QueueTestBase.java,v 1.1.24.1 2007/01/13 01:31:39 stack-sf Exp $
38  */
39 public abstract class QueueTestBase extends TmpDirTestCase {
40     /**
41      * Create a new PaddingStringBufferTest object
42      *
43      * @param testName the name of the test
44      */
45     public QueueTestBase(final String JavaDoc testName) {
46         super(testName);
47     }
48
49     public void setUp() throws Exception JavaDoc {
50         super.setUp();
51         queue = makeQueue();
52     }
53
54     public void tearDown() {
55         if(queue != null) {
56             queue.release();
57         }
58     }
59
60     /**
61      * The abstract subclass constructor. The subclass should create an
62      * instance of the object it wishes to have tested
63      *
64      * @return the Queue object to be tested
65      */
66     protected abstract Queue<Object JavaDoc> makeQueue();
67
68     /*
69      * test methods
70      */
71
72     /** test that queue puts things on, and they stay there :) */
73     public void testQueue() {
74         assertEquals("no items in new queue", 0, queue.length());
75         assertTrue("queue is empty", queue.isEmpty());
76         queue.enqueue("foo");
77         assertEquals("now one item in queue", 1, queue.length());
78         assertFalse("queue not empty", queue.isEmpty());
79     }
80
81     /** test that dequeue works */
82     public void testDequeue() {
83         assertEquals("no items in new queue", 0, queue.length());
84         assertTrue("queue is empty", queue.isEmpty());
85         queue.enqueue("foo");
86         queue.enqueue("bar");
87         queue.enqueue("baz");
88         assertEquals("now three items in queue", 3, queue.length());
89         assertEquals("foo dequeued", "foo", queue.dequeue());
90         assertEquals("bar dequeued", "bar", queue.dequeue());
91         assertEquals("baz dequeued", "baz", queue.dequeue());
92
93         assertEquals("no items in new queue", 0, queue.length());
94         assertTrue("queue is empty", queue.isEmpty());
95
96     }
97
98     /** check what happens we dequeue on empty */
99     public void testDequeueEmptyQueue() {
100         assertTrue("queue is empty", queue.isEmpty());
101
102         try {
103             queue.dequeue();
104         } catch (NoSuchElementException JavaDoc e) {
105             return;
106         }
107         fail("Expected a NoSuchElementException on dequeue of empty queue");
108     }
109     /*
110      * member variables
111      */
112
113     /** the queue object to be tested */
114     protected Queue<Object JavaDoc> queue;
115 }
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