@Test
public void testWrappedHadoopConf() {

  String key = "sampler";
  String value = "ProbabilitySampler";
  Configuration conf = new Configuration();
  conf.set(TEST_PREFIX + key, value);
  HTraceConfiguration wrapped = TraceUtils.wrapHadoopConf(TEST_PREFIX, conf);
  assertEquals(value, wrapped.get(key));
}