systemtest.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 80 行

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;

public class SystemTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
        return new TestSuite(SystemTest.class);
    }

    /**
     * Worst case rounding for millisecs; set for 60 cycle millis clock.
     * This value might need to be changed os JVMs with coarser
     *  System.currentTimeMillis clocks.
     */
    static final long MILLIS_ROUND = 17;

//    /**
//     * Nanos between readings of millis is no longer than millis (plus
//     * possible rounding).
//     * This shows only that nano timing not (much) worse than milli.
//     */
//    public void testNanoTime1() {
//        try {
//            long m1 = System.currentTimeMillis();
//            Thread.sleep(1);
//            long n1 = System.nanoTime();
//            Thread.sleep(SHORT_DELAY_MS);
//            long n2 = System.nanoTime();
//            Thread.sleep(1);
//            long m2 = System.currentTimeMillis();
//            long millis = m2 - m1;
//            long nanos = n2 - n1;
//            assertTrue(nanos >= 0);
//            long nanosAsMillis = nanos / 1000000;
//            assertTrue(nanosAsMillis <= millis + MILLIS_ROUND);
//        }
//        catch(InterruptedException ie) {
//            unexpectedException();
//        }
//    }
//
//    /**
//     * Millis between readings of nanos is less than nanos, adjusting
//     * for rounding.
//     * This shows only that nano timing not (much) worse than milli.
//     */
//    public void testNanoTime2() {
//        try {
//            long n1 = System.nanoTime();
//            Thread.sleep(1);
//            long m1 = System.currentTimeMillis();
//            Thread.sleep(SHORT_DELAY_MS);
//            long m2 = System.currentTimeMillis();
//            Thread.sleep(1);
//            long n2 = System.nanoTime();
//            long millis = m2 - m1;
//            long nanos = n2 - n1;
//
//            assertTrue(nanos >= 0);
//            long nanosAsMillis = nanos / 1000000;
//            assertTrue(millis <= nanosAsMillis + MILLIS_ROUND);
//        }
//        catch(InterruptedException ie) {
//            unexpectedException();
//        }
//    }

}