从 xml 文件作为组运行测试用例时出现 NullPointer 异常

问题描述 投票：0回答：1

我是硒新手。我尝试从 xml 文件运行两个类。我将测试分组在这两个类中。但是当我在 xml 文件中添加标签时，它给出了一个空指针异常。但是当我运行它时它工作正常。驱动程序首先没有初始化。

01班

package DemoPractise;

import io.github.bonigarcia.wdm.WebDriverManager;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.*;


import java.util.concurrent.TimeUnit;

public class Annotation {
    WebDriver  driver = new ChromeDriver();;
    @BeforeSuite
    public void browserSetup(){
        driver = new ChromeDriver();
        driver.manage().window().maximize();
       // driver.get("https://www.lambdatest.com/selenium-playground/");
    }


    @Test(groups = "original")
    public void test1_BtsDatePicker()  {
        driver.get("https://www.lambdatest.com/selenium-playground/");
        driver.findElement(By.linkText("Bootstrap Date Picker")).click();

    }

    @Test (groups = {"regression","smoke"})
    public void test2_BtsListBox()  {
        driver.get("https://www.lambdatest.com/selenium-playground/");

        driver.findElement(By.linkText("Bootstrap List Box")).click();
    }
    @AfterSuite
    public void tearDown(){
        driver.close();
    }



}

02班

package DemoPractise;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.AfterSuite;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.Test;

import java.util.concurrent.TimeUnit;

public class annotation2 {

    WebDriver driver;

    @BeforeSuite
    public void browserSetup1(){
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }

    @Test(groups = {"regression","optional"})
    public void test3_JQueryDatePicker() throws InterruptedException {
        driver.get("https://www.lambdatest.com/selenium-playground/");

        driver.findElement(By.linkText("JQuery Date Picker")).click();
        TimeUnit.SECONDS.sleep(2);
    }
    @Test(groups = "smoke")
    public void test4_JQueryListBox() throws InterruptedException {
        driver.get("https://www.lambdatest.com/selenium-playground/");
        TimeUnit.SECONDS.sleep(2);
        driver.findElement(By.linkText("JQuery List Box")).click();
        TimeUnit.SECONDS.sleep(2);
    }
    @AfterSuite
    public void tearDown1(){
        driver.close();
    }


}

xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Annotation running">

    <test name="Annotation Test Runner With Group!" >
        <groups>
            <run>
                <include name="smoke"/>
            </run>
        </groups>
        <classes>
            <class name="DemoPractise.Annotation"/>
            <class name="DemoPractise.annotation2"/>

        </classes>
    </test>

</suite>

错误日志

java.lang.NullPointerException
    at DemoPractise.Annotation.test2_BtsListBox(Annotation.java:31)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
    at org.testng.internal.invokers.TestInvoker.invokeMethod(TestInvoker.java:664)
    at org.testng.internal.invokers.TestInvoker.invokeTestMethod(TestInvoker.java:227)
    at org.testng.internal.invokers.MethodRunner.runInSequence(MethodRunner.java:50)
    at org.testng.internal.invokers.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:957)
    at org.testng.internal.invokers.TestInvoker.invokeTestMethods(TestInvoker.java:200)
    at org.testng.internal.invokers.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:148)
    at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:128)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
    at org.testng.TestRunner.privateRun(TestRunner.java:848)
    at org.testng.TestRunner.run(TestRunner.java:621)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:443)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:437)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:397)
    at org.testng.SuiteRunner.run(SuiteRunner.java:336)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:95)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1280)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1200)
    at org.testng.TestNG.runSuites(TestNG.java:1114)
    at org.testng.TestNG.run(TestNG.java:1082)
    at com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:66)
    at com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:105)


java.lang.NullPointerException
    at DemoPractise.annotation2.test4_JQueryListBox(annotation2.java:32)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
    at org.testng.internal.invokers.TestInvoker.invokeMethod(TestInvoker.java:664)
    at org.testng.internal.invokers.TestInvoker.invokeTestMethod(TestInvoker.java:227)
    at org.testng.internal.invokers.MethodRunner.runInSequence(MethodRunner.java:50)
    at org.testng.internal.invokers.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:957)
    at org.testng.internal.invokers.TestInvoker.invokeTestMethods(TestInvoker.java:200)
    at org.testng.internal.invokers.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:148)
    at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:128)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
    at org.testng.TestRunner.privateRun(TestRunner.java:848)
    at org.testng.TestRunner.run(TestRunner.java:621)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:443)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:437)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:397)
    at org.testng.SuiteRunner.run(SuiteRunner.java:336)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:95)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1280)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1200)
    at org.testng.TestNG.runSuites(TestNG.java:1114)
    at org.testng.TestNG.run(TestNG.java:1082)
    at com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:66)
    at com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:105)


===============================================
Annotation running
Total tests run: 2, Passes: 0, Failures: 2, Skips: 0
===============================================


Process finished with exit code 0

我尝试在@BeforeMethod 中设置驱动程序。但当使用标签命名 xml 文件中的组时，它不会初始化。

selenium-webdriver intellij-idea selenium-chromedriver testng testng.xml
1个回答
0
投票

您在测试类中遇到的 NullPointerException 可能是由于您初始化 WebDriver 实例和类中的测试方法的方式造成的。问题是 WebDriver 实例是在任何测试方法之外初始化的，导致执行测试方法时它为 null。 要解决此问题，您应该在每个测试方法中初始化 WebDriver 实例或使用 TestNG 的 @BeforeMethod 注释。

WebDriver driver;

    @BeforeSuite
    public void browserSetup() {
        WebDriverManager.chromedriver().setup(); // You should setup WebDriverManager for Chrome
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }

    @Test(groups = "original")
    public void test1_BtsDatePicker() {
        driver.get("https://www.lambdatest.com/selenium-playground/");
        driver.findElement(By.linkText("Bootstrap Date Picker")).click();
    }

    @Test(groups = {"regression", "smoke"})
    public void test2_BtsListBox() {
        driver.get("https://www.lambdatest.com/selenium-playground/");
        driver.findElement(By.linkText("Bootstrap List Box")).click();
    }

    @AfterSuite
    public void tearDown() {
        if (driver != null) {
            driver.quit(); // Use quit to close the browser and release resources
        }
    }
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