maven2-plugins/myfaces-javascript-plugin/src/test/java/org/apache/myfaces/buildtools/maven2/plugin/javascript/jmt/compress/IsolatedClassLoaderTest.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.myfaces.buildtools.maven2.plugin.javascript.jmt.compress;

import java.io.File;
import java.net.URL;

import junit.framework.TestCase;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.DefaultArtifact;
import org.apache.maven.artifact.factory.ArtifactFactory;
import org.codehaus.plexus.PlexusTestCase;

/**
 * @author <a href="mailto:nicolas@apache.org">Nicolas De Loof</a>
 */
public class IsolatedClassLoaderTest
    extends PlexusTestCase
{

    private ArtifactFactory artifactFactory;

    protected void setUp()
        throws Exception
    {
        super.setUp();
        artifactFactory = (ArtifactFactory) lookup( ArtifactFactory.class.getName() );
    }

    /**
     * Ensure a class can be loaded in isolation based on an artifact
     */
    public void testLoadClassInIsolation()
        throws Exception
    {
        // Create an artifact for junit.jar
        Artifact artifact =
            artifactFactory.createArtifact( "junit", "junit", "3.8.2", DefaultArtifact.SCOPE_TEST,
                "jar" );
        // locate junit.jar based on current loader class
        URL url = getClass().getClassLoader().getResource( "junit/framework/TestCase.class" );
        String path = url.toString();
        assertTrue( "junit TestCase class is not loaded from a jar", path.startsWith( "jar:" ) );
        int i = path.indexOf( '!' );
        url = new URL( path.substring( 4, i ) );

        // setup the isolated classloader
        artifact.setFile( new File( url.getFile() ) );
        ClassLoader cl = new IsolatedClassLoader( artifact );

        Class isolated = cl.loadClass( "junit.framework.TestCase" );
        assertNotNull( "failed to load TestCase class in isolation", isolated );
        assertTrue( "TestCase loaded, but not in isolation", isolated != TestCase.class );
    }
}