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