1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.collections4;
18
19 import static org.junit.jupiter.api.Assertions.assertSame;
20 import static org.junit.jupiter.api.Assertions.assertThrows;
21 import static org.junit.jupiter.api.Assertions.assertTrue;
22
23 import org.apache.commons.collections4.trie.PatriciaTrie;
24 import org.apache.commons.collections4.trie.UnmodifiableTrie;
25 import org.junit.jupiter.api.Test;
26
27 /**
28 * Tests for TrieUtils factory methods.
29 */
30 public class TrieUtilsTest {
31
32 @Test
33 public void testUnmodifiableTrie() {
34 final Trie<String, Object> trie = TrieUtils.unmodifiableTrie(new PatriciaTrie<>());
35 assertTrue(trie instanceof UnmodifiableTrie, "Returned object should be an UnmodifiableTrie.");
36
37 assertThrows(NullPointerException.class, () -> TrieUtils.unmodifiableTrie(null));
38
39 assertSame(trie, TrieUtils.unmodifiableTrie(trie), "UnmodifiableTrie shall not be decorated");
40 }
41
42 }
43