Add test case for situation where context classloader is null.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/logging/trunk@169388 13f79535-47bb-0310-9956-ffa450edef68

src/test/org/apache/commons/logging/NullClassLoaderTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2001-2004 The Apache Software Foundation.
+ * 
+ * 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.
+ */ 
+package org.apache.commons.logging;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Test cases for situations where getClassLoader or getContextClassLoader
+ * return null. This can happen when using JDK 1.1. It can also happen when
+ * JCL is deployed via the bootclassloader - something that could be done when
+ * using java in embedded systems.
+ */
+public class NullClassLoaderTest extends TestCase{
+
+    //---------------------- Main ---------------------------------    
+
+    /**
+     * Main method so this test case can be run direct from the command line.
+     */
+    public static void main(String[] args){
+        String[] testCaseName = { NullClassLoaderTest.class.getName() };
+        junit.textui.TestRunner.main(testCaseName);
+    }
+
+    //---------------------- Constructors ---------------------------------    
+
+    /** Creates a new instance of LoadTest */
+    public NullClassLoaderTest(String testName) {
+        super(testName);
+    }
+
+    //---------------------- JUnit methods ---------------------------------    
+    
+    public static Test suite() {
+        TestSuite suite = new TestSuite();
+        suite.addTestSuite(NullClassLoaderTest.class);
+        return suite;
+    }
+    
+    //---------------------- unit tests ---------------------------------    
+    
+    /**
+     * This tests that when getContextClassLoader returns null, the
+     * LogFactory.getLog(name) method still correctly returns the same
+     * log object when called multiple times with the same name.
+     */
+    public void testSameLogObject() throws Exception {
+        ClassLoader oldContextClassLoader = Thread.currentThread().getContextClassLoader();
+        try {
+            // emulate an app (not a webapp) running code loaded via the 
+            // "null" classloader (bootclassloader for JDK1.2+, or
+            // systemclassloader for jdk1.1).
+            Thread.currentThread().setContextClassLoader(null);
+            
+            Log log1 = LogFactory.getLog("foo");
+            Log log2 = LogFactory.getLog("foo");
+            
+            assertSame(
+                "Calling getLog twice with the same category " +
+                "resulted in different objects!", 
+                log1, log2);
+        } finally {
+            Thread.currentThread().setContextClassLoader(oldContextClassLoader);
+        }
+    }
+}

src/test/org/apache/commons/logging/TestAll.java

@@ -44,6 +44,7 @@ public class TestAll extends TestCase {
         suite.addTest(SimpleLogTest.suite());
         suite.addTest(NoOpLogTest.suite());
         suite.addTest(LogTest.suite());
+        suite.addTest(NullClassLoaderTest.suite());
         
         return suite;
     }