The “Time Test” means if an unit test takes longer than the specified number of milliseconds to run, the test will terminated and mark as fails.

import org.testng.annotations.*;
 
/**
 * TestNG TimeOut Test
 * @author mkyong
 *
 */
public class TestNGTest4 {
 
	@Test(timeOut = 1000)  
	public void infinity() {  
		while (true);  
	}  
 
}

Result

FAILED: infinity
org.testng.internal.thread.ThreadTimeoutException: Method public void TestNGTest4.infinity() didn’t finish within the time-out 1000
… Removed 18 stack frames