@Test
public void testAcceptNotFinal() throws Exception {

  Path path0 = new Path(output, "clusters-0");
  Path path1 = new Path(output, "clusters-1");
  path0.getFileSystem(configuration).createNewFile(path0);
  path1.getFileSystem(configuration).createNewFile(path1);
  PathFilter clustersFilter = new ClustersFilter();
  assertTrue(clustersFilter.accept(path0));
  assertTrue(clustersFilter.accept(path1));
}