public static void cleanDiskDirs() {
    FileUtils.deleteQuietly(JUnit4CacheTestCase.getDiskDir());
    FileUtils.deleteQuietly(JUnit4CacheTestCase.getDiskDir());
    Arrays.stream(new File(".").listFiles()).forEach(
        JUnit4DistributedTestCase::deleteBACKUPDiskStoreFile);
  }
This constructor should only be used internally, not by tests.
geode-dunit/src/main/java/org/apache/geode/test/dunit/internal/JUnit4DistributedTestCase.java