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1 /*
2 * Copyright (c) 2002-2003 by OpenSymphony
3 * All rights reserved.
4 */
5 package com.opensymphony.oscache.base.algorithm;
6
7 import junit.framework.Test;
8 import junit.framework.TestSuite;
9
10 /**
11 * Test class for the LRUCache class. It only tests that the algorithm reacts as
12 * expected when entries are removed. All the other tests related to the LRU
13 * algorithm are in the TestNonQueueCache class, since those tests are shared
14 * with the TestUnlimitedCache class.
15 *
16 * $Id: TestLRUCache.java,v 1.1 2005/06/17 05:07:08 dres Exp $
17 * @version $Revision: 1.1 $
18 * @author <a href="mailto:abergevin@pyxis-tech.com">Alain Bergevin</a>
19 */
20 public final class TestLRUCache extends TestQueueCache {
21 /**
22 * LRU Cache object
23 */
24 private static LRUCache cache = null;
25
26 /**
27 * Constructor
28 * <p>
29 * @param str The test name (required by JUnit)
30 */
31 public TestLRUCache(String str) {
32 super(str);
33 }
34
35 /**
36 * This methods returns the name of this test class to JUnit
37 * <p>
38 * @return The test for this class
39 */
40 public static Test suite() {
41 return new TestSuite(TestLRUCache.class);
42 }
43
44 /**
45 * Abstract method used by the TestAbstractCache class
46 * <p>
47 * @return A cache instance
48 */
49 public AbstractConcurrentReadCache getCache() {
50 return cache;
51 }
52
53 /**
54 * This method is invoked before each testXXXX methods of the
55 * class. It set ups the variables required for each tests.
56 */
57 public void setUp() {
58 // Create a cache instance on first invocation
59 if (cache == null) {
60 cache = new LRUCache();
61 assertNotNull(cache);
62 }
63 }
64
65 /**
66 * Test the cache algorithm
67 */
68 public void testRemoveItem() {
69 // Add 3 elements
70 cache.itemPut(KEY);
71 cache.itemPut(KEY + 1);
72 cache.itemPut(KEY + 2);
73
74 // Get the last element
75 cache.itemRetrieved(KEY);
76
77 // The least recently used item is key + 1
78 assertTrue((KEY + 1).equals(cache.removeItem()));
79 }
80 }