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package org.junit.tests.experimental.parallel;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.junit.Test;
import org.junit.experimental.ParallelComputer;
import org.junit.internal.matchers.TypeSafeMatcher;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;
public class ParallelClassTest {
public static class Example1 {
@Test public void one() throws InterruptedException {
Thread.sleep(1000);
}
}
public static class Example2 {
@Test public void one() throws InterruptedException {
Thread.sleep(1000);
}
}
@RunWith(Suite.class)
@SuiteClasses({Example1.class, Example2.class})
public static class ExampleSuite {}
@Test(timeout=1500) public void testsRunInParallel() {
long start= System.currentTimeMillis();
Result result= JUnitCore.runClasses(ParallelComputer.classes(), Example1.class, Example2.class);
assertTrue(result.wasSuccessful());
long end= System.currentTimeMillis();
assertThat(end - start, greaterThan(999)); // Overhead could be less than half a millisecond
}
private Matcher<Long> greaterThan(final long l) {
return new TypeSafeMatcher<Long>() {
@Override
public boolean matchesSafely(Long item) {
return item > l;
}
public void describeTo(Description description) {
description.appendText("greater than " + l);
}
};
}
}
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