private File createCleanDir() throws IOException {
   String buildRoot = System.getProperty(TestCaseUtils.PROPERTY_BUILD_ROOT);
   String path =
       System.getProperty(TestCaseUtils.PROPERTY_BUILD_DIR, buildRoot + File.separator + "build");
   path = path + File.separator + "unit-tests" + File.separator + "JEReplicaDB";
   final File testRoot = new File(path);
   TestCaseUtils.deleteDirectory(testRoot);
   testRoot.mkdirs();
   return testRoot;
 }