@Test
public void all() throws Exception {

    TrieTree trieTree = new TrieTree();
    trieTree.insert("ABC");
    trieTree.insert("abC");
    List<String> all = trieTree.all();
    String result = "";
    for (String s : all) {
        result += s + ",";
        System.out.println(s);
    }
    Assert.assertTrue("ABC,abC,".equals(result));
}