/*
 * Copyright 2012-2014 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.itest.standalone;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import org.junit.runner.notification.Failure;
import org.junit.runner.notification.RunListener;

/**
 * Stack trace printer for failed tests.
 *
 */
public class StandaloneReportsListener extends RunListener {

    private final File currentTestFailureFile;
    
    public StandaloneReportsListener(File testFile) {
        currentTestFailureFile = testFile;
    }
    
    @Override
    public void testFailure(Failure failure) {
        writeStackTraceToErrorFile(failure);
    }
    
    private void writeStackTraceToErrorFile(Failure failure) {
        Throwable expn = failure.getException();
        // make sure we append to any existing file so as to not overwrite
        // earlier failed tests.
        try (FileWriter fw = new FileWriter(currentTestFailureFile, true);
                PrintWriter pw = new PrintWriter(fw)) {
            expn.printStackTrace(pw);
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
    }
}

