private void verifyGetUniqKey(DummyDFSOutputStream dummy) throws Exception {
    Optional<Method> getUniqKeyMethod = getUniqKeyMethod();
    if (getUniqKeyMethod.isPresent()) {
      getUniqKeyMethod.get().invoke(verify(dummy));
    } else {
      verify(dummy).getFileId();
    }
  }
Make sure lease renewal works. Since it is in a background thread, normal read/write test can not
verify it.
<p>
See HBASE-28955 for more details.
hbase-asyncfs/src/test/java/org/apache/hadoop/hbase/io/asyncfs/TestLeaseRenewal.java