TrieImpl trie = new TrieImpl(mockDb);
trie.update("do", "verb");
trie.update("ether", "wookiedoo");
trie.update("horse", "stallion");
trie.update("shaman", "horse");
trie.update("doge", "coin");
trie.update("ether", "");
trie.update("dog", "puppy");
trie.update("shaman", "");
assertEquals("5991bb8c6514148a29db676a14ac506cd2cd5775ace63c30a4fe457715e9ac84", Hex.toHexString(trie.getRootHash()));