private static void validateHFiles(FileSystem fs, String outputPath, String family,
    int expectedKVCount) throws IOException {
    // validate number and content of output columns
    LOG.debug("Validating HFiles.");
    Set<String> configFamilies = new HashSet<>();
    configFamilies.add(family);
    Set<String> foundFamilies = new HashSet<>();
    int actualKVCount = 0;
    for (FileStatus cfStatus : fs.listStatus(new Path(outputPath), new OutputFilesFilter())) {
      String[] elements = cfStatus.getPath().toString().split(Path.SEPARATOR);
      String cf = elements[elements.length - 1];
      foundFamilies.add(cf);
      assertTrue(String.format(
        "HFile output contains a column family (%s) not present in input families (%s)", cf,
        configFamilies), configFamilies.contains(cf));
      for (FileStatus hfile : fs.listStatus(cfStatus.getPath())) {
        assertTrue(String.format("HFile %s appears to contain no data.", hfile.getPath()),
          hfile.getLen() > 0);
        // count the number of KVs from all the hfiles
        if (expectedKVCount > -1) {
          actualKVCount += getKVCountFromHfile(fs, hfile.getPath());
        }
      }
    }
    assertTrue(String.format("HFile output does not contain the input family '%s'.", family),
      foundFamilies.contains(family));
    if (expectedKVCount > -1) {
      assertTrue(
        String.format("KV count in ouput hfile=<%d> doesn't match with expected KV count=<%d>",
          actualKVCount, expectedKVCount),
        actualKVCount == expectedKVCount);
    }
  }
Confirm ImportTsv via HFiles on fs.
hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportTsv.java