@Override
  public void setConf(Configuration conf) {
    super.setConf(conf);
    getRawMapping().setConf(conf);
  }
@Test
  public void testFilenameMeansMultiSwitch() throws Throwable {
    Configuration conf = new Configuration();
    conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
    ScriptBasedMapping mapping = createMapping(conf);
    assertFalse("Expected to be multi switch", mapping.isSingleSwitch());
    mapping.setConf(new Configuration());
    assertTrue("Expected to be single switch", mapping.isSingleSwitch());
  }