private void assertKVLessWithoutRow(CellComparator c, KeyValue less, KeyValue greater) {
    int cmp = c.compare(less, greater);
    assertTrue(cmp < 0);
    cmp = c.compare(greater, less);
    assertTrue(cmp > 0);
  }
Tests cases where rows keys have characters below the ','. See HBASE-832
hbase-common/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java