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 <rdar://problem/4064974>
  27  @summary Tests nano time and also makes sure that it does not take too long to make consecutive time calls
  28  @summary com.apple.junit.java.vm
  29  @run junit nanoTime_R4064974
  30  */
  31 
  32 import junit.framework.*;
  33 
  34 import static java.lang.System.currentTimeMillis;
  35 import static java.lang.System.nanoTime;
  36 
  37 public class nanoTime_R4064974 extends TestCase {
  38     public void testnanoTime_R4064974() throws Exception {
  39         long time = 0;
  40         long newTime;
  41         long smaller = 9999999999999L;
  42 
  43         for (int i = 0; i < 10000; i++) {
  44             time = nanoTime();
  45             newTime = nanoTime();
  46             smaller = Math.min(smaller, newTime - time);
  47         }
  48 
  49         long milliTime = currentTimeMillis();
  50         long nanoTime = nanoTime();
  51         assertTrue("it's taking to long to call nanoTime() after calling currentTimeMillis()", (nanoTime - (milliTime * 1000000)) < 5000000);
  52     }
  53 
  54     public static Test suite() {
  55         return new TestSuite(nanoTime_R4064974.class);
  56     }
  57 
  58     public static void main (String[] args) throws RuntimeException {
  59         TestResult tr = junit.textui.TestRunner.run(suite());
  60         if((tr.errorCount() != 0) || (tr.failureCount() != 0)) {
  61             throw new RuntimeException("### Unexpected JUnit errors or failures.");
  62         }
  63     }
  64 }