1 /*
   2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  @test
  26  @summary basic tests of System.nanoTime()
  27  @summary com.apple.junit.java.lang.System;
  28  @run main SystemNanoTimeTest
  29  */
  30 
  31 import junit.framework.*;
  32 
  33 public class SystemNanoTimeTest extends TestCase {
  34 
  35     public static Test suite() {
  36             return new TestSuite(SystemNanoTimeTest.class);
  37     }
  38 
  39     public static void main (String[] args) throws RuntimeException {
  40         TestResult tr = junit.textui.TestRunner.run(suite());
  41         if((tr.errorCount() != 0) || (tr.failureCount() != 0)) {
  42             throw new RuntimeException("### Unexpected JUnit errors or failures.");
  43         }
  44     }
  45 
  46     public void testSimplestTime() {
  47         long start = System.nanoTime();
  48         // now, do some stuff
  49         Object object = new Object();
  50         @SuppressWarnings("unused")
  51         Class classOfObject = object.getClass();
  52         // ok, that is enough.
  53         long stop = System.nanoTime();
  54         assertTrue("time should not have stopped, and the JVM is not infinitely fast...", (stop > start));
  55     }
  56 }