package test.thread;
import org.testng.Assert;
import org.testng.TestNG;
import org.testng.annotations.Test;
import org.testng.xml.XmlSuite;
import test.SimpleBaseTest;
import java.util.Arrays;
import java.util.List;
/**
* Attempt to make sure that we are truly running methods in parallel. The best I can think
* of right now is to run the tests a few times in a row and verify the ordering is never
* the same.
*/
public class TrueParallelTest extends SimpleBaseTest {
@Test
public void shouldRunInParallel() {
boolean success = false;
for (int i = 0, count = Runtime.getRuntime().availableProcessors() * 4; i < count; i++) {
XmlSuite s = createXmlSuite("TrueParallel");
createXmlTest(s, "Test", TrueParallelSampleTest.class.getName());
TestNG tng = create();
s.setParallel(XmlSuite.PARALLEL_METHODS);
tng.setXmlSuites(Arrays.asList(s));
BaseThreadTest.initThreadLog();
tng.run();
// A sequential result will look like "m1 m1 m3 m3 m2 m2 m4 m4 m5 m5". A properly
// multithreaded result will have at least one non-consecutive different pair:
// "m1 m1 m3 m2 m4 m4 m2 m3 m5 m5"
List<String> strings = TrueParallelSampleTest.getStrings();
boolean ii = isInterleaved(strings);
success = success || ii;
// System.out.println(strings + " -> " + ii);
}
Assert.assertTrue(success, "Couldn't find any interleaved test method run");
}
private boolean isInterleaved(List<String> strings) {
for (int i = 0; i < strings.size(); i += 2) {
if (! strings.get(i).equals(strings.get(i + 1))) {
return true;
}
}
return false;
}
}