jdk-24/test/jdk/java/lang/Thread/SleepWithDuration.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @summary Test Thread.sleep(Duration)
 * @run testng SleepWithDuration
 */

import java.time.Duration;
import java.util.concurrent.TimeUnit;

import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class SleepWithDuration {

    /**
     * Basic test for sleep(Duration).
     */
    @Test
    public void testSleep() throws Exception {
        // sleep for 2 seconds
        long start = millisTime();
        Thread.sleep(Duration.ofMillis(2000));
        expectDuration(start, /*min*/1900, /*max*/20_000);

        Thread.sleep(Duration.ofNanos(-1));
        Thread.sleep(Duration.ofNanos(0));
        Thread.sleep(Duration.ofNanos(1));

        assertThrows(NullPointerException.class, () -> Thread.sleep(null));
    }

    /**
     * Test Thread.sleep with interrupt status set.
     */
    @Test
    public void testSleepWithInterruptStatusSet() throws Exception {
        Thread.currentThread().interrupt();
        try {
            Thread.sleep(Duration.ofNanos(0));
            fail();
        } catch (InterruptedException e) {
            assertFalse(Thread.interrupted());
        }

        Thread.currentThread().interrupt();
        try {
            Thread.sleep(Duration.ofSeconds(2));
            fail();
        } catch (InterruptedException e) {
            assertFalse(Thread.interrupted());
        }
    }

    /**
     * Test interrupting Thread.sleep.
     */
    @Test
    public void testInterruptSleep() throws Exception {
        // schedule current thread to interrupted after 1s
        Thread targetThread = Thread.currentThread();
        Thread wakerThread = new Thread(() -> {
            try {
                Thread.sleep(1000);
                targetThread.interrupt();
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
        wakerThread.start();
        try {
            Thread.sleep(Duration.ofSeconds(60));
            fail();
        } catch (InterruptedException e) {
            // interrupt status should be cleared
            assertFalse(Thread.interrupted());
        } finally {
            wakerThread.interrupt();
        }
    }

    /**
     * Returns the current time in milliseconds.
     */
    private static long millisTime() {
        long now = System.nanoTime();
        return TimeUnit.MILLISECONDS.convert(now, TimeUnit.NANOSECONDS);
    }

    /**
     * Check the duration of a task
     * @param start start time, in milliseconds
     * @param min minimum expected duration, in milliseconds
     * @param max maximum expected duration, in milliseconds
     * @return the duration (now - start), in milliseconds
     */
    private static void expectDuration(long start, long min, long max) {
        long duration = millisTime() - start;
        assertTrue(duration >= min,
                "Duration " + duration + "ms, expected >= " + min + "ms");
        assertTrue(duration <= max,
                "Duration " + duration + "ms, expected <= " + max + "ms");
    }
}