TemporaryDirectory.java

import java.io.File;
import java.io.IOException;

public class TemporaryDirectory {

	private File temporaryDirectory;
	
	public boolean create(String prefix) throws IOException {
		File temporaryFile = File.createTempFile(prefix, ".tmp");
		try {
			temporaryDirectory = new File(temporaryFile.getParentFile(),
				String.format("%s%d", prefix, System.currentTimeMillis()));
			return temporaryDirectory.mkdir();
		} finally {
			temporaryFile.delete();
		}		
	}
	
	public boolean remove() {
		return temporaryDirectory.delete();
	}
	
	public File newFile(String name) throws IOException {
		File newFile = new File(temporaryDirectory, name);
		if(!newFile.createNewFile()) {
			throw new IOException(String.format(
				"Couldn't create new file '%s' in directory'%'",
				name, temporaryDirectory));
		}
		return newFile;
	}

	
}

TemporaryDirectoryTest.java

import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;

import java.io.File;
import java.io.IOException;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TemporaryDirectoryTest {

	TemporaryDirectory tempDir = new TemporaryDirectory();
	
	@Before
	public void setUp() throws IOException {
		tempDir.create("TemporaryDirectoryTest");
	}
	
	@After
	public void tearDown() {
		tempDir.remove();
	}
	
	@Test
	public void test() throws IOException {
		File myFile = tempDir.newFile("myfile.txt");
		assertThat(myFile.exists(), is(true));
	}
	
}