/*
 * 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
 *
 *      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.apache.commons.io.testtools;

import java.io.*;

/**
 * Base class for testcases doing tests with files.
 */
public abstract class FileBasedTestCase  {

    private static volatile File testDir;

    @SuppressWarnings("ResultOfMethodCallIgnored")
    public static File getTestDirectory() {
        if (testDir == null) {
            testDir = new File("test/io/").getAbsoluteFile();
        }
        testDir.mkdirs();
        return testDir;
    }


}

/*
 * 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
 *
 *      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.apache.commons.io.testtools;

import java.io.*;
import static org.junit.Assert.fail;

/**
 * Base class for testcases doing tests with files.
 */
public abstract class FileBasedTestCase  {

    private static volatile File testDir;

    @SuppressWarnings("ResultOfMethodCallIgnored")
    public static File getTestDirectory() {
        if (testDir == null) {
            testDir = new File("target/test_io/").getAbsoluteFile();
        }
        testDir.mkdirs();
        if (!testDir.isDirectory()) {
            fail("Could not create directory " + testDir);
        }
        return testDir;
    }


}

Use temporary dir that can be fully deleted