package org.codehaus.mojo.exec;

/*
 * 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 org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.net.URLClassLoader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;

import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;

/**
 * Basic tests about the custom classloader we set to execute the project.
 */
public class URLClassLoaderBuilderTest
{
    @Test
    public void childFirst() throws Exception
    {
        ByteArrayOutputStream stderr = new ByteArrayOutputStream();
        PrintStream originalStderr = System.err;
        Thread thread = Thread.currentThread();
        ClassLoader testLoader = thread.getContextClassLoader();
        try ( URLClassLoader loader = URLClassLoaderBuilder.builder()
                .setPaths( asList(
                        Paths.get( "target/test-dependencies/slf4j-api.jar" ),
                        Paths.get( "target/test-dependencies/slf4j-jdk14.jar" )
                ) )
                .build();
            PrintStream tmpStderr = new PrintStream( stderr ) )
        {
            System.setErr( tmpStderr );
            assertEquals( tmpStderr, System.err );
            thread.setContextClassLoader( loader );
            Class<?> lf = loader.loadClass( "org.slf4j.LoggerFactory" );
            Object logger = lf.getMethod( "getLogger", Class.class ).invoke( null, String.class );
            assertEquals( "org.slf4j.impl.JDK14LoggerAdapter", logger.getClass().getName() );
        }
        finally
        {
            thread.setContextClassLoader( testLoader );
        }
        assertEquals("", new String( stderr.toByteArray(), StandardCharsets.UTF_8 ) );
        System.setErr( originalStderr );
    }
}