@Override
  public String getScheme() {
    return "file";
  }
@Test
  public void testStatistics() throws Exception {
    int fileSchemeCount = 0;
    for (Statistics stats : FileSystem.getAllStatistics()) {
      if (stats.getScheme().equals("file")) {
        fileSchemeCount++;
      }
    }
    assertEquals(1, fileSchemeCount);
  }