@Test(expected = FileNotFoundException.class)
  public void shouldThrowErrorIfMultiHFileDoesNotExist() throws IOException {
    List<Pair<byte[], String>> list = new ArrayList<>();
    list.addAll(asList(withMissingHFileForFamily(family1)));
    list.addAll(asList(withMissingHFileForFamily(family2)));
    testRegionWithFamilies(family1, family2).bulkLoadHFiles(list, false, null);
  }
This class attempts to unit test bulk HLog loading.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestBulkLoad.java