为什么用Junit没有输出结果

[K.Sun]

public class Car extends Thread {
    private CyclicBarrier cyclicBarrier;

    public Car(CyclicBarrier cyclicBarrier) {
        super();
        this.cyclicBarrier = cyclicBarrier;
    }

    @Override
    public void run() {
        try {
            Thread.sleep((int)(Math.random() * 1000));
            System.out.println(Thread.currentThread().getName() + " arrived at " + System.currentTimeMillis());
            cyclicBarrier.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (BrokenBarrierException e) {
            e.printStackTrace();
        }
    }
}

测试类：

public class TestCyclicBarrier {
    public static void main(String[] args) {
        CyclicBarrier cyclicBarrier = new CyclicBarrier(5, new Runnable() {
            @Override
            public void run() {
                System.out.println("All arrived!");
            }
        });

        Car[] carArray = new Car[5];
        for (int i = 0; i < carArray.length; i++) {
            carArray[i] = new Car(cyclicBarrier);
        }
        for (int i = 0; i < carArray.length; i++) {
            carArray[i].start();
        }
    }

}

这个有输出，但是下面这个就没输出：

public class TestCyclicBarrier {
    @Test
    public void test() {
        CyclicBarrier cyclicBarrier = new CyclicBarrier(5, new Runnable() {
            @Override
            public void run() {
                System.out.println("All arrived!");
            }
        });

        Car[] carArray = new Car[5];
        for (int i = 0; i < carArray.length; i++) {
            carArray[i] = new Car(cyclicBarrier);
        }
        for (int i = 0; i < carArray.length; i++) {
            carArray[i].start();
        }
    }

}

求指点……