1/*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the
10 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
11 * express or implied. See the License for the specific language governing permissions and
12 * limitations under the License.
13 */
14
15package com.google.common.collect;
16
17import com.google.common.annotations.GwtCompatible;
18import com.google.common.collect.BstTesting.SimpleNode;
19
20import junit.framework.TestCase;
21
22/**
23 * Simple tests for {@code BstPath}.
24 *
25 * @author Louis Wasserman
26 */
27@GwtCompatible
28public class BstPathTest extends TestCase {
29  static class SimplePath extends BstPath<SimpleNode, SimplePath> {
30    private SimplePath(SimpleNode tip, SimplePath tail) {
31      super(tip, tail);
32    }
33  }
34
35  public void testTailAtRoot() {
36    SimpleNode root = new SimpleNode('a', null, null);
37    SimplePath rootPath = new SimplePath(root, null);
38    assertFalse(rootPath.hasPrefix());
39    assertNull(rootPath.prefixOrNull());
40    try {
41      rootPath.getPrefix();
42      fail("Expected IllegalStateException");
43    } catch (IllegalStateException expected) {}
44  }
45
46  public void testTailDown() {
47    SimpleNode node = new SimpleNode('a', null, null);
48    SimpleNode root = new SimpleNode('b', node, null);
49    SimplePath rootPath = new SimplePath(root, null);
50    SimplePath nodePath = new SimplePath(node, rootPath);
51    assertTrue(nodePath.hasPrefix());
52    assertEquals(rootPath, nodePath.prefixOrNull());
53    assertEquals(rootPath, nodePath.getPrefix());
54  }
55}
56