@Test
public void testToString() {

  assertThat(trie.toString(), not(Matchers.isEmptyOrNullString()));
  trie.insert(Path.of("/"), "/");
  assertThat(trie.toString(), not(Matchers.isEmptyOrNullString()));
  trie.insert(Path.of("/<foo>"), "/<foo>");
  assertThat(trie.toString(), not(Matchers.isEmptyOrNullString()));
  trie.insert(Path.of("/<foo>/<bar:path>"), "/<foo>/<bar:path>");
  assertThat(trie.toString(), not(Matchers.isEmptyOrNullString()));
}