@BeforeClass
  public static void setUpBeforeClass() throws Exception {
    // disable the ui
    TEST_UTIL.getConfiguration().setInt("hbase.regionsever.info.port", -1);

    TEST_UTIL.getConfiguration().setLong("hbase.regionserver.logroll.period", LOG_ROLL_PERIOD);

    TEST_UTIL.startMiniCluster();
  }
Tests that verifies that the log is forced to be rolled every "hbase.regionserver.logroll.period"
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestLogRollPeriod.java