util/src/test/java/org/apache/directory/api/util/exception/MultiExceptionTest.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
 *  
 *    https://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.directory.api.util.exception;


import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/**
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class MultiExceptionTest
{
    private PrintStream originalOut;
    private PrintStream originalErr;

    @BeforeEach
    public void setUp()
    {
        originalOut = System.out;
        originalErr = System.err;
    }


    @AfterEach
    public void tearDown()
    {
        System.setOut( originalOut );
        System.setErr( originalErr );
    }


    @Test
    public void testPrintStacktracePrintWriterDoesNotWriteToSystemOutErr()
    {
        ByteArrayOutputStream systemOut = new ByteArrayOutputStream();
        PrintStream systemPrintStream = new PrintStream( systemOut );
        System.setOut( systemPrintStream );
        System.setErr( systemPrintStream );

        StringWriter customOut = new StringWriter();
        PrintWriter customPrintWriter = new PrintWriter( customOut );
        MultiException multiException = new MultiException( "multi" );
        multiException.addThrowable( new Exception( "nested1" ) );
        multiException.addThrowable( new Exception( "nested2" ) );
        multiException.printStackTrace( customPrintWriter );

        assertThat( customOut.toString(), containsString( "multi" ) );
        assertThat( customOut.toString(), containsString( "nested1" ) );
        assertThat( customOut.toString(), containsString( "nested2" ) );
        assertThat( systemOut.size(), equalTo( 0 ) );
    }


    @Test
    public void testPrintStacktraceToPrintStreamDoesNotWriteToSystemOutErr()
    {
        ByteArrayOutputStream systemOut = new ByteArrayOutputStream();
        PrintStream systemPrintStream = new PrintStream( systemOut );
        System.setOut( systemPrintStream );
        System.setErr( systemPrintStream );

        ByteArrayOutputStream customOut = new ByteArrayOutputStream();
        PrintStream customPrintWriter = new PrintStream( customOut );
        MultiException multiException = new MultiException( "multi" );
        multiException.addThrowable( new Exception( "nested1" ) );
        multiException.addThrowable( new Exception( "nested2" ) );
        multiException.printStackTrace( customPrintWriter );

        assertThat( customOut.toString(), containsString( "multi" ) );
        assertThat( customOut.toString(), containsString( "nested1" ) );
        assertThat( customOut.toString(), containsString( "nested2" ) );
        assertThat( systemOut.size(), equalTo( 0 ) );
    }
}