### Question:
LoadIncrementalHFiles extends Configured implements Tool { public static byte[][] inferBoundaries(TreeMap<byte[], Integer> bdryMap) { ArrayList<byte[]> keysArray = new ArrayList<byte[]>(); int runningValue = 0; byte[] currStartKey = null; boolean firstBoundary = true; for (Map.Entry<byte[], Integer> item: bdryMap.entrySet()) { if (runningValue == 0) currStartKey = item.getKey(); runningValue += item.getValue(); if (runningValue == 0) { if (!firstBoundary) keysArray.add(currStartKey); firstBoundary = false; } } return keysArray.toArray(new byte[0][0]); } LoadIncrementalHFiles(Configuration conf, Boolean useSecure);  LoadIncrementalHFiles(Configuration conf); void doBulkLoad(Path hfofDir, final HTable table); static byte[][] inferBoundaries(TreeMap<byte[], Integer> bdryMap); @Override int run(String[] args); static void main(String[] args); static String NAME; }### Answer:
@Test public void testInferBoundaries() { TreeMap<byte[], Integer> map = new TreeMap<byte[], Integer>(Bytes.BYTES_COMPARATOR); String first; String last; first = "a"; last = "e"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "r"; last = "s"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "o"; last = "p"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "g"; last = "k"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "v"; last = "x"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "c"; last = "i"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "m"; last = "q"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "s"; last = "t"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); first = "u"; last = "w"; addStartEndKeysForTest(map, first.getBytes(), last.getBytes()); byte[][] keysArray = LoadIncrementalHFiles.inferBoundaries(map); byte[][] compare = new byte[3][]; compare[0] = "m".getBytes(); compare[1] = "r".getBytes(); compare[2] = "u".getBytes(); assertEquals(keysArray.length, 3); for (int row = 0; row<keysArray.length; row++){ assertArrayEquals(keysArray[row], compare[row]); } }