Selenium使用之前的退出驱动器，即使我打开一个新的。抛出错误：调用quit（）后无法使用FirefoxDriver

Question

我有一个父网页测试，由测试类调用，如下所示：

public class Webtest
{
protected static WebDriver driver;

@BeforeMethod
public static WebDriver openUrl(String URL)
{
    driver = new FirefoxDriver();
    driver.get(URL);
    System.out.println("Driver started :"+ driver);
    return driver;
}

public static WebDriver closeDriver(){
  driver.quit();
  System.out.println("Driver closed :"+ driver);
}
}

现在我在扩展它的测试类中实现上述内容。

public class testClass extends WebTest
{

@Test
public void TC01()
{   System.out.println("Test1:" + driver);
    // Do something using driver
}


@Test
public void TC02()
{
 System.out.println("Test2:" + driver);
    // Do something
}
}

现在结果：

Driver started :FirefoxDriver: firefox on MAC (dfe4e055-4555-0d4d-8a83-a9a802159ea7)
Test1:FirefoxDriver: firefox on MAC (dfe4e055-4555-0d4d-8a83-a9a802159ea7)
Driver closed :FirefoxDriver: firefox on MAC (dfe4e055-4555-0d4d-8a83-a9a802159ea7)
Driver started :FirefoxDriver: firefox on MAC (1370df47-483b-574c-9792-9bb5fa077364)
Test2:FirefoxDriver: firefox on MAC (1370df47-483b-574c-9792-9bb5fa077364)
[Error] resulted in an exception: The FirefoxDriver cannot be used after quit() was called.

基本上，我假设test2正在使用以前的驱动程序。我没有调用第二个驱动程序退出但是我收到了错误。我确实把睡眠放在每种方法之间，并尝试但没有任何效果。有帮助吗？我正在使用firefox 46。