1   /*
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.util;
21  
22  import org.apache.hadoop.hbase.MediumTests;
23  import org.junit.Test;
24  import org.junit.experimental.categories.Category;
25  
26  import static junit.framework.Assert.assertTrue;
27  import static junit.framework.Assert.fail;
28  
29  /**
30   * Tests to make sure that the default environment edge conforms to appropriate
31   * behaviour.
32   */
33  @Category(MediumTests.class)
34  public class TestDefaultEnvironmentEdge {
35  
36    @Test
37    public void testGetCurrentTimeUsesSystemClock() {
38      DefaultEnvironmentEdge edge = new DefaultEnvironmentEdge();
39      long systemTime = System.currentTimeMillis();
40      long edgeTime = edge.currentTimeMillis();
41      assertTrue("System time must be either the same or less than the edge time",
42              systemTime < edgeTime || systemTime == edgeTime);
43      try {
44        Thread.sleep(1);
45      } catch (InterruptedException e) {
46        fail(e.getMessage());
47      }
48      long secondEdgeTime = edge.currentTimeMillis();
49      assertTrue("Second time must be greater than the first",
50              secondEdgeTime > edgeTime);
51    }
52  
53  
54    @org.junit.Rule
55    public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
56      new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
57  }
58