/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2009 - 2013 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of any organization.
 * #L%
 */

package imagej.test;

import java.io.File;
import java.io.IOException;
import java.net.URL;

import org.scijava.util.ClassUtils;
import org.scijava.util.FileUtils;

/**
 * A bunch of helpful functions for unit tests.
 * 
 * @author Johannes Schindelin
 */
public class TestUtils {

	/**
	 * Makes a temporary directory for use with unit tests.
	 * <p>
	 * When the unit test runs in a Maven context, the temporary directory will be
	 * created in the corresponding <i>target/</i> directory instead of
	 * <i>/tmp/</i>.
	 * </p>
	 * 
	 * @param prefix the prefix for the directory's name
	 * @param forClass the class for context (to determine whether there's a
	 *          <i>target/<i> directory)
	 * @return the reference to the newly-created temporary directory
	 * @throws IOException
	 */
	public static File createTemporaryDirectory(final String prefix,
		final Class<?> forClass) throws IOException
	{
		final URL directory = ClassUtils.getLocation(forClass);
		if (directory != null && "file".equals(directory.getProtocol())) {
			final String path = directory.getPath();
			if (path != null && path.endsWith("/target/test-classes/")) {
				final File baseDirectory =
					new File(path.substring(0, path.length() - 13));
				final File file = File.createTempFile(prefix, "", baseDirectory);
				if (file.delete() && file.mkdir()) return file;
			}
		}
		return FileUtils.createTemporaryDirectory(prefix, "");
	}

}

Add a function to create temporary directories for tests