assertEquals(null, h.extractByKey(key2, data));
assertEquals(0, h.countCollisions(key2, data));
assertEquals(null, h.extractByKey(key3, data));
assertEquals(0, h.countCollisions(key3, data));
data1 = h.assemble(key1, value1);
data1 = h.assemble(key2, value2, data1);
data1 = h.assemble(key3, value3, data1);
List<byte[]> keys = h.extractKeys(data1);
assertEquals(3, keys.size());