如何在testng中实现set属性

Question

    import org.testng.annotations.*;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class redc {
    public static WebDriver driver=null;
    public static  void startdriver()
    {
    String key="webdriver.gecko.driver";
    String path="C:\\selenium3\\geckodriver\\geckodriver.exe";
    System.setProperty(key,path);
    driver = new FirefoxDriver();
        }
    @BeforeMethod
    public void call()
    {


    }
    @Test
    public void t1()
    {
        driver.get("https://www.dynamiclevels.com/");
    }

我试图运行这段代码，但不断出错。

失败: sun.reflect.NativeMethodAccessorImpl.invoke0(Native方法的t1 java.lang.NullPointerException at datac.redc.t1(redc.java:25)在sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown来源)

请帮我改正密码。如果可能的话，可以用一种方式重写它。我确信我犯了同样愚蠢的错误，我抓不到。:(

Answer 1

@BeforeTest
public void setup() {
    String key= "webdriver.gecko.driver";
    String path= "C:\\selenium3\\geckodriver\\geckodriver.exe";
    System.setProperty(key, path);
    driver = new FirefoxDriver();
}

并从WebDriver中删除静态：

private WebDriver driver;