/** the test */
  @Test
  @SuppressWarnings("unchecked")
  public void testSortedMapWritable() {
    Text[] keys = {
      new Text("key1"), new Text("key2"), new Text("key3"),
    };

    BytesWritable[] values = {
      new BytesWritable("value1".getBytes()),
      new BytesWritable("value2".getBytes()),
      new BytesWritable("value3".getBytes())
    };

    SortedMapWritable inMap = new SortedMapWritable();
    for (int i = 0; i < keys.length; i++) {
      inMap.put(keys[i], values[i]);
    }

    assertEquals(0, inMap.firstKey().compareTo(keys[0]));
    assertEquals(0, inMap.lastKey().compareTo(keys[2]));

    SortedMapWritable outMap = new SortedMapWritable(inMap);
    assertEquals(inMap.size(), outMap.size());

    for (Map.Entry<WritableComparable, Writable> e : inMap.entrySet()) {
      assertTrue(outMap.containsKey(e.getKey()));
      assertEquals(0, ((WritableComparable) outMap.get(e.getKey())).compareTo(e.getValue()));
    }

    // Now for something a little harder...

    Text[] maps = {new Text("map1"), new Text("map2")};

    SortedMapWritable mapOfMaps = new SortedMapWritable();
    mapOfMaps.put(maps[0], inMap);
    mapOfMaps.put(maps[1], outMap);

    SortedMapWritable copyOfMapOfMaps = new SortedMapWritable(mapOfMaps);
    for (int i = 0; i < maps.length; i++) {
      assertTrue(copyOfMapOfMaps.containsKey(maps[i]));

      SortedMapWritable a = (SortedMapWritable) mapOfMaps.get(maps[i]);
      SortedMapWritable b = (SortedMapWritable) copyOfMapOfMaps.get(maps[i]);
      assertEquals(a.size(), b.size());
      for (Writable key : a.keySet()) {
        assertTrue(b.containsKey(key));

        // This will work because we know what we put into each set

        WritableComparable aValue = (WritableComparable) a.get(key);
        WritableComparable bValue = (WritableComparable) b.get(key);
        assertEquals(0, aValue.compareTo(bValue));
      }
    }
  }