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.junit.Test;
23  
24  import static junit.framework.Assert.assertTrue;
25  import static junit.framework.Assert.fail;
26  
27  /**
28   * Tests to make sure that the default environment edge conforms to appropriate
29   * behaviour.
30   */
31  public class TestDefaultEnvironmentEdge {
32  
33    @Test
34    public void testGetCurrentTimeUsesSystemClock() {
35      DefaultEnvironmentEdge edge = new DefaultEnvironmentEdge();
36      long systemTime = System.currentTimeMillis();
37      long edgeTime = edge.currentTimeMillis();
38      assertTrue("System time must be either the same or less than the edge time",
39              systemTime < edgeTime || systemTime == edgeTime);
40      try {
41        Thread.sleep(1);
42      } catch (InterruptedException e) {
43        fail(e.getMessage());
44      }
45      long secondEdgeTime = edge.currentTimeMillis();
46      assertTrue("Second time must be greater than the first",
47              secondEdgeTime > edgeTime);
48    }
49  
50  }