@Test
  public void testKillRsHoldingMeta() throws Exception {
    assumeFalse(tablesOnMaster());
    run(new ActionCallable(restartMetaAction), "KillRsHoldingMeta");
  }
The load test tool used to create load and make sure that WALs aren't empty.
hbase-it/src/test/java/org/apache/hadoop/hbase/mttr/IntegrationTestMTTR.java