# 7\. TestNG超時測試
“超時”表示如果單元測試花費的時間超過指定的毫秒數，那么TestNG將會中止它并將其標記為失敗。此項常用于性能測試。如下為一個范例：
```
import org.testng.annotations.Test;
public class TestCase1 {
@Test(timeOut = 5000) // time in mulliseconds
public void testThisShouldPass() throws InterruptedException {
Thread.sleep(4000);
}
@Test(timeOut = 1000)
public void testThisShouldFail() {
while (true){
// do nothing
}
}
}
```
結果如下：
PASSED: testThisShouldPass
FAILED: testThisShouldFail
org.testng.internal.thread.ThreadTimeoutException: Method com.demo.test.testng.TestCase1.testThisShouldFail() didn't finish within the time-out 1000
at com.demo.test.testng.TestCase1.testThisShouldFail(TestCase1.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:104)
at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:54)
at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:44)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
