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 * Verify that the context class loader is a custom one, then reset it to
36 * a non-custom one.
37 */
38 private static void checkAndSetContext() {
39 final ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
40 assertEquals("ContextLoader is of unexpected type",
41 contextLoader.getClass().getName(),
42 PathableClassLoader.class.getName());
43
44 final URL[] noUrls = {};
45 Thread.currentThread().setContextClassLoader(new URLClassLoader(noUrls));
46 }
47
48 /**
49 * Verify that a certain system property is not set, then set it.
50 */
51 private static void checkAndSetProperties() {
52 String prop = System.getProperty("no.such.property");
53 assertNull("no.such.property is unexpectedly defined", prop);
54 System.setProperty("no.such.property", "dummy value");
55 prop = System.getProperty("no.such.property");
56 assertNotNull("no.such.property is unexpectedly undefined", prop);
57 }
58
59 /**
60 * Sets up a custom class loader hierarchy for this test case.
61 */
62 public static Test suite() throws Exception {
63 final Class<GeneralTestCase> thisClass = GeneralTestCase.class;
64 final ClassLoader thisClassLoader = thisClass.getClassLoader();
65
66 final PathableClassLoader loader = new PathableClassLoader(null);
67 loader.useExplicitLoader("junit.", thisClassLoader);
68 loader.addLogicalLib("testclasses");
69
70 // reload this class via the child class loader
71 final Class<?> testClass = loader.loadClass(thisClass.getName());
72
73 // and return our custom TestSuite class
74 return new PathableTestSuite(testClass, loader);
75 }
76
77 /**
78 * Verify that when a test method modifies the context class loader it is
79 * reset before the next test is run.
80 * <p>
81 * This method works in conjunction with testResetContext2. There is no
82 * way of knowing which test method junit will run first, but it doesn't
83 * matter; whichever one of them runs first will modify the contextClassloader.
84 * If the PathableTestSuite isn't resetting the contextClassLoader then whichever
85 * of them runs second will fail. Of course if other methods are run in-between
86 * then those methods might also fail...
87 */
88 public void testResetContext1() {
89 checkAndSetContext();
90 }
91
92 /**
93 * See testResetContext1.
94 */
95 public void testResetContext2() {
96 checkAndSetContext();
97 }
98
99 /**
100 * Verify that when a test method modifies the system properties they are
101 * reset before the next test is run.
102 * <p>
103 * This method works in conjunction with testResetProps2. 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 system properties.
106 * If the PathableTestSuite isn't resetting the system properties 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 testResetProps1() {
111 checkAndSetProperties();
112 }
113
114 /**
115 * See testResetProps1.
116 */
117 public void testResetProps2() {
118 checkAndSetProperties();
119 }
120 }