ForkedJvmTest.java

package org.codehaus.mojo.javacc;

/*
 * 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.
 */

import java.io.File;

import org.codehaus.plexus.util.cli.CommandLineUtils.StringStreamConsumer;

import junit.framework.TestCase;

/**
 * Tests <code>ForkedJvm</code>.
 * 
 * @author Benjamin Bentmann
 * @version $Id$
 */
public class ForkedJvmTest
    extends TestCase
{

    public void testToStringNullSafe()
        throws Exception
    {
        ForkedJvm jvm = new ForkedJvm();
        String string = jvm.toString();
        assertNotNull( string );
        assertTrue( string.indexOf( "null" ) < 0 );
    }

    public void testSettersNullSafe()
        throws Exception
    {
        ForkedJvm jvm = new ForkedJvm();
        jvm.addArgument( (File) null );
        jvm.addArgument( (String) null );
        jvm.addArguments( null );
        jvm.addArguments( new String[] { null } );
        jvm.addClassPathEntry( (Class) null );
        jvm.addClassPathEntry( (File) null );
        jvm.addClassPathEntry( (String) null );
        jvm.setMainClass( (Class) null );
        jvm.setMainClass( (String) null );
        jvm.setWorkingDirectory( null );
        jvm.setSystemOut( null );
        jvm.setSystemErr( null );
    }

    public void testSetMainClass()
        throws Exception
    {
        ForkedJvm jvm1 = new ForkedJvm();
        jvm1.setMainClass( MainStub.class );
        String cmd1 = jvm1.toString();
        assertTrue( cmd1.indexOf( MainStub.class.getName() ) >= 0 );

        ForkedJvm jvm2 = new ForkedJvm();
        jvm2.setMainClass( MainStub.class.getName() );
        String cmd2 = jvm2.toString();
        assertTrue( cmd2.indexOf( MainStub.class.getName() ) >= 0 );

        assertEquals( cmd1, cmd2 );
    }

    public void testFork()
        throws Exception
    {
        File workDir = new File( System.getProperty( "user.home" ) ).getCanonicalFile();
        File file = new File( "test" ).getAbsoluteFile();
        String nonce = Integer.toString( hashCode() );

        StringStreamConsumer stdout = new StringStreamConsumer();
        StringStreamConsumer stderr = new StringStreamConsumer();

        ForkedJvm jvm = new ForkedJvm();
        jvm.setWorkingDirectory( workDir );
        jvm.setSystemOut( stdout );
        jvm.setSystemErr( stderr );
        jvm.setMainClass( MainStub.class );
        jvm.addArgument( nonce );
        jvm.addArguments( new String[] { "arg1", "arg2" } );
        jvm.addArgument( file );
        System.out.println( "Forking: " + jvm );
        int exitcode = jvm.run();
        String out = stdout.getOutput();
        String err = stderr.getOutput();
        String[] args = out.split( "(\r\n)|(\r)|(\n)" );

        assertEquals( 27, exitcode );

        assertEquals( workDir, new File( err.trim() ) );

        assertEquals( 4, args.length );
        assertEquals( nonce, args[0] );
        assertEquals( "arg1", args[1] );
        assertEquals( "arg2", args[2] );
        assertEquals( file, new File( args[3] ) );
    }

}