### Question:
RadixTreeImpl implements RadixTree<T>, Formattable { public long getSize() { return size; } RadixTreeImpl(); T find(String key); boolean delete(String key); void insert(String key, T value); ArrayList<T> searchPrefix(String key, int recordLimit); boolean contains(String key); void visit(String key, Visitor<T, R> visitor); long getSize(); @Deprecated void display(); @Override void formatTo(Formatter formatter, int flags, int width, int precision); String complete(String prefix);  }### Answer:
@Test public void testGetSize() { trie.insert("apple", "apple"); trie.insert("appleshack", "appleshack"); trie.insert("appleshackcream", "appleshackcream"); trie.insert("applepie", "applepie"); trie.insert("ape", "ape"); assertTrue(trie.getSize() == 5); }