Added an example junit-test.

Kieker.WebGUI/.classpath

 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" output="target/classes" path="src/main/java"/>
+	<classpathentry kind="src" path="src/test/java"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER"/>
 	<classpathentry kind="output" path="target/classes"/>

Kieker.WebGUI/pom.xml

@@ -66,6 +66,11 @@
             <artifactId>maven-pmd-plugin</artifactId>
             <version>2.6</version>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.10</version>
+        </dependency>
         <dependency>
             <groupId>javax</groupId>
             <artifactId>javaee-web-api</artifactId>

Kieker.WebGUI/src/test/java/kieker/webgui/common/PluginFinderTest.java

+/***************************************************************************
+ * Copyright 2012 by
+ *  + Christian-Albrechts-University of Kiel
+ *    + Department of Computer Science
+ *      + Software Engineering Group 
+ *  and others.
+ *
+ * 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 kieker.webgui.common;
+
+import java.io.File;
+import java.net.MalformedURLException;
+import java.util.List;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+import org.junit.Test;
+
+/**
+ * @author Nils Christian Ehmke
+ * @version 1.0
+ */
+public class PluginFinderTest extends TestCase {
+
+	/**
+	 * Creates a new instance of this class.
+	 */
+	public PluginFinderTest() {}
+
+	@Test
+	public void testKiekerJarContainsPlugins() {
+		/* It can be assumed that the kieker jar contains at least one plugin. */
+		try {
+			final List<Class<?>> availableKiekerPlugins = PluginFinder.getAllPluginsWithinJar(new File("lib/kieker-1.5-SNAPSHOT.jar").toURL());
+
+			Assert.assertTrue("Kieker-Jar seems to contain no plugins.", availableKiekerPlugins.size() > 0);
+		} catch (final MalformedURLException ex) {
+			Assert.fail("Exception occured.");
+		}
+	}
+}