1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.logging.pathable;
18
19 import java.net.URL;
20 import java.net.URLClassLoader;
21
22 import junit.framework.Test;
23 import junit.framework.TestCase;
24
25 import org.apache.commons.logging.PathableClassLoader;
26 import org.apache.commons.logging.PathableTestSuite;
27
28 /**
29 * Tests for the PathableTestSuite class.
30 */
31
32 public class GeneralTestCase extends TestCase {
33
34 /**
35 * Set up a custom classloader hierarchy for this test case.
36 */
37 public static Test suite() throws Exception {
38 Class thisClass = GeneralTestCase.class;
39 ClassLoader thisClassLoader = thisClass.getClassLoader();
40
41 PathableClassLoader loader = new PathableClassLoader(null);
42 loader.useExplicitLoader("junit.", thisClassLoader);
43 loader.addLogicalLib("testclasses");
44
45 // reload this class via the child classloader
46 Class testClass = loader.loadClass(thisClass.getName());
47
48 // and return our custom TestSuite class
49 return new PathableTestSuite(testClass, loader);
50 }
51
52 /**
53 * Verify that a certain system property is not set, then set it.
54 */
55 private static void checkAndSetProperties() {
56 String prop = System.getProperty("no.such.property");
57 assertNull("no.such.property is unexpectedly defined", prop);
58 System.setProperty("no.such.property", "dummy value");
59 prop = System.getProperty("no.such.property");
60 assertNotNull("no.such.property is unexpectedly undefined", prop);
61 }
62
63 /**
64 * Verify that when a test method modifies the system properties they are
65 * reset before the next test is run.
66 * <p>
67 * This method works in conjunction with testResetProps2. There is no
68 * way of knowing which test method junit will run first, but it doesn't
69 * matter; whichever one of them runs first will modify the system properties.
70 * If the PathableTestSuite isn't resetting the system properties then whichever
71 * of them runs second will fail. Of course if other methods are run in-between
72 * then those methods might also fail...
73 */
74 public void testResetProps1() {
75 checkAndSetProperties();
76 }
77
78 /**
79 * See testResetProps1.
80 */
81 public void testResetProps2() {
82 checkAndSetProperties();
83 }
84
85 /**
86 * Verify that the context classloader is a custom one, then reset it to
87 * a non-custom one.
88 */
89 private static void checkAndSetContext() {
90 ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
91 assertEquals("ContextLoader is of unexpected type",
92 contextLoader.getClass().getName(),
93 PathableClassLoader.class.getName());
94
95 URL[] noUrls = new URL[0];
96 Thread.currentThread().setContextClassLoader(new URLClassLoader(noUrls));
97 }
98
99 /**
100 * Verify that when a test method modifies the context classloader it is
101 * reset before the next test is run.
102 * <p>
103 * This method works in conjunction with testResetContext2. There is no
104 * way of knowing which test method junit will run first, but it doesn't
105 * matter; whichever one of them runs first will modify the contextClassloader.
106 * If the PathableTestSuite isn't resetting the contextClassLoader then whichever
107 * of them runs second will fail. Of course if other methods are run in-between
108 * then those methods might also fail...
109 */
110 public void testResetContext1() {
111 checkAndSetContext();
112 }
113
114 /**
115 * See testResetContext1.
116 */
117 public void testResetContext2() {
118 checkAndSetContext();
119 }
120 }