### Question:
Trie { public int getSize() { return size; } Trie(); boolean insertWord(String s); boolean containsWord(String s); boolean containsAsPrefix(String s); boolean containsPrefixOf(String s); int getSize();  }### Answer:
@Test public void testGetSizeEmptyTrie() { Trie trie = new Trie(); assertThat(trie.getSize(), is(0)); }