/**
 *
 * Copyright © 2018 Paul Schaub
 *
 * Licensed 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.jivesoftware.smack.test.util;

import java.io.File;

public class FileTestUtil {

    /**
     * Returns a {@link File} pointing to a temporary directory. On unix like systems this might be {@code /tmp}
     * for example.
     * If {@code suffix} is not null, the returned file points to {@code <temp>/suffix}.
     *
     * @param suffix optional path suffix
     * @return temp directory
     */
    public static File getTempDir(String suffix) {
        String temp = System.getProperty("java.io.tmpdir");
        if (temp == null) {
            temp = "tmp";
        }

        if (suffix == null) {
            return new File(temp);
        } else {
            return new File(temp, suffix);
        }
    }
}

Add utility method to get temp directory
Add utility method to get temp directory
