TestNG，WebDriver。当我运行套件时，第二次测试因nullPointerException而失败

Question

我创建了两个测试。在超类方法中拉出BeforeSuite和AfterSuite。

测试单独传递但在我作为包执行时失败。

字符串错误NullPointerException     driver.get(baseUrl + "test/test/");

public class MyTestBase {
    private WebDriver driver;
    private String baseUrl;
    private boolean acceptNextAlert = true;


    @BeforeSuite
    public void setUp() throws Exception {
        driver = new FirefoxDriver();
        baseUrl = "http://test.com/";
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
    }

    @AfterSuite
    public void tearDown() throws Exception {
        driver.quit();
    }

代码：

private void login() throws InterruptedException {
    driver.get(baseUrl + "test/test/");
    driver.findElement(By.xpath("//input")).clear();
    driver.findElement(By.xpath("//input")).sendKeys("user234");
    driver.findElement(By.xpath("//div[2]/div[2]/div/input")).clear();
    driver.findElement(By.xpath("//div[2]/div[2]/div/input")).sendKeys("645637");
    submitButton();
    Thread.sleep(2000);
}

测试1

`public class AddEquipment extends MyTestBase { }`

测试2

`public class AddAnotherEquipment extends MyTestBase { }`

两个测试都是相同的，但使用不同的参数设备和描述字段。

我刚开始学习WebDriver并尝试创建简单的东西。

测试代码1：

package com.example.tests;

import org.testng.annotations.Test;

public class AddEquipment extends MyTestBase {

    @Test
    public void testAddEquipment() throws Exception {
        GroupData group = new GroupData("Equipment", "Description");
        createEquipment(group);
        // assert
    }

    protected void createEquipment(GroupData group) throws InterruptedException {
        login();
        menuClickEquipment();
        clickAddButton();
        fillOutForm(group);
        submitButton();
        logout();
    }

    private void login() throws InterruptedException {
        driver.get(baseUrl + "test/test/");
        driver.findElement(By.xpath("//input")).clear();
        driver.findElement(By.xpath("//input")).sendKeys("user234");
        driver.findElement(By.xpath("//div[2]/div[2]/div/input")).clear();
        driver.findElement(By.xpath("//div[2]/div[2]/div/input")).sendKeys("645637");
        submitButton();
        Thread.sleep(2000);
    }