1/*
2 * Copyright (C) 2013 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.util.concurrent;
18
19import static com.google.common.util.concurrent.Service.State.FAILED;
20import static com.google.common.util.concurrent.Service.State.NEW;
21import static com.google.common.util.concurrent.Service.State.RUNNING;
22import static com.google.common.util.concurrent.Service.State.STARTING;
23import static com.google.common.util.concurrent.Service.State.STOPPING;
24import static com.google.common.util.concurrent.Service.State.TERMINATED;
25
26import junit.framework.TestCase;
27
28/**
29 * Unit tests for {@link Service}
30 */
31public class ServiceTest extends TestCase {
32
33  /** Assert on the comparison ordering of the State enum since we guarantee it. */
34  public void testStateOrdering() {
35    // List every valid (direct) state transition.
36    assertLessThan(NEW, STARTING);
37    assertLessThan(NEW, TERMINATED);
38
39    assertLessThan(STARTING, RUNNING);
40    assertLessThan(STARTING, STOPPING);
41    assertLessThan(STARTING, FAILED);
42
43    assertLessThan(RUNNING, STOPPING);
44    assertLessThan(RUNNING, FAILED);
45
46    assertLessThan(STOPPING, FAILED);
47    assertLessThan(STOPPING, TERMINATED);
48  }
49
50  private static <T extends Comparable<? super T>> void assertLessThan(T a, T b) {
51    if (a.compareTo(b) >= 0) {
52      fail(String.format("Expected %s to be less than %s", a, b));
53    }
54  }
55}
56