@Test
  public void bulkHLogShouldThrowNoErrorAndWriteMarkerWithBlankInput() throws IOException {
    testRegionWithFamilies(family1).bulkLoadHFiles(new ArrayList<>(), false, null);
  }
This class attempts to unit test bulk HLog loading.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestBulkLoad.java