RemoteTestNG.java : 76 错误 while 运行 TestNG 测试集

Question

下面是我正在尝试运行的代码。当我运行下面的代码时，Mercury 游览的网站打开并且执行停止在那里抛出下面提到的错误列表在此代码之后。我尝试卸载并重新安装 TestNG 框架，但徒劳无功。

package testNG1;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class MercuryTours 
{
    public WebDriver driver;
    public WebDriverWait wait;

    @BeforeClass
    public void openBrowser()
    {
        System.setProperty("webdriver.gecko.driver", "C:\\Users\Diganta\Desktop\Workspace\Library\geckodriver.exe");
        WebDriver driver=new FirefoxDriver();
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        wait = new WebDriverWait(driver, 10);

        driver.get("http://newtours.demoaut.com/");
    }

    @AfterMethod
    public void goBackToHomePage()
    {
        driver.findElement(By.linkText("Home")).click();
        wait.until(ExpectedConditions.titleContains("Welcome"));
    }

    @Test(priority=1)
    public void verifySigninPage()
    {
        driver.findElement(By.linkText("SIGN-ON")).click();
        wait.until(ExpectedConditions.titleContains("Sign-on"));
        String actual = driver.getTitle();
        String expected = "Sign-on: Mercury Tours";
        Assert.assertEquals(actual, expected);
    }

    @Test(priority=2)
    public void verifyRegisterPage()
    {
        driver.findElement(By.linkText("REGISTER")).click();
        wait.until(ExpectedConditions.titleContains("Register"));
        String actual = driver.getTitle();
        String expected = "Register: Mercury Tours";
        Assert.assertEquals(actual, expected);
    }

    @Test(priority=3)
    public void verifySupportPage(){
        driver.findElement(By.linkText("SUPPORT")).click();
        wait.until(ExpectedConditions.titleContains("Support"));
        String actual = driver.getTitle();
        String expected = "Support: Mercury Tours";
        Assert.assertEquals(actual, expected);
    }

    @Test(priority=4)
    public void verifyContactPage()
    {
        driver.findElement(By.linkText("CONTACT")).click();
        wait.until(ExpectedConditions.titleContains("Contact"));
        String actual = driver.getTitle();
        String expected = "Contact: Mercury Tours";
        Assert.assertEquals(actual, expected);
    }

    @AfterClass
    public void closeBrowser()
    {
        driver.close();
    }

}

我在 Eclipse 输出控制台中收到以下错误

FAILED CONFIGURATION: @AfterMethod goBackToHomePage
java.lang.NullPointerException
    at testNG1.MercuryTours.goBackToHomePage(MercuryTours.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:723)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:744)
    at org.testng.TestRunner.run(TestRunner.java:602)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
    at org.testng.SuiteRunner.run(SuiteRunner.java:289)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
    at org.testng.TestNG.runSuites(TestNG.java:1144)
    at org.testng.TestNG.run(TestNG.java:1115)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)

SKIPPED CONFIGURATION: @AfterClass closeBrowser
FAILED: verifySigninPage
java.lang.NullPointerException
    at testNG1.MercuryTours.verifySigninPage(MercuryTours.java:43)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:661)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:744)
    at org.testng.TestRunner.run(TestRunner.java:602)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
    at org.testng.SuiteRunner.run(SuiteRunner.java:289)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
    at org.testng.TestNG.runSuites(TestNG.java:1144)
    at org.testng.TestNG.run(TestNG.java:1115)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)

SKIPPED: verifyRegisterPage
java.lang.NullPointerException
    at testNG1.MercuryTours.goBackToHomePage(MercuryTours.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:723)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:744)
    at org.testng.TestRunner.run(TestRunner.java:602)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
    at org.testng.SuiteRunner.run(SuiteRunner.java:289)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
    at org.testng.TestNG.runSuites(TestNG.java:1144)
    at org.testng.TestNG.run(TestNG.java:1115)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)

SKIPPED: verifySupportPage
java.lang.NullPointerException
    at testNG1.MercuryTours.goBackToHomePage(MercuryTours.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:723)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:744)
    at org.testng.TestRunner.run(TestRunner.java:602)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
    at org.testng.SuiteRunner.run(SuiteRunner.java:289)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
    at org.testng.TestNG.runSuites(TestNG.java:1144)
    at org.testng.TestNG.run(TestNG.java:1115)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)

SKIPPED: verifyContactPage
java.lang.NullPointerException
    at testNG1.MercuryTours.goBackToHomePage(MercuryTours.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:723)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:744)
    at org.testng.TestRunner.run(TestRunner.java:602)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
    at org.testng.SuiteRunner.run(SuiteRunner.java:289)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
    at org.testng.TestNG.runSuites(TestNG.java:1144)
    at org.testng.TestNG.run(TestNG.java:1115)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)


===============================================
    Default test
    Tests run: 4, Failures: 1, Skips: 3
    Configuration Failures: 1, Skips: 1
===============================================


===============================================
Default suite
Total tests run: 4, Failures: 1, Skips: 3
Configuration Failures: 1, Skips: 1
===============================================

Answer 1

错误 @AfterMethod goBackToHomePage 和 java.lang.NullPointerException 说明了一切。

您已在 public WebDriver driver; 中将 WebDriver 的实例声明为 Class 范围内的全局变量。

在 @BeforeClass 注释下的 openBrowser() 方法中向前移动，您已经启动了 WebDriver 的另一个实例，如 WebDriver driver=new FirefoxDriver(); 中。

因此，一旦执行完第一个方法，就会调用 @AfterMethod 注释中的 goBackToHomePage() 方法，悬空驱动程序实例开始发挥作用并导致 java.lang.NullPointerException.

解决方案：

这里的直接解决方案是在您已在 Class 级别全局声明的程序中使用 WebDriver 的单个实例，并将 WebDriver driver=new FirefoxDriver(); 更改为 driver=new FirefoxDriver();

RemoteTestNG.java : 76 错误 while 运行 TestNG 测试集

RemoteTestNG.java : 76 error while running TestNG test set

testng

automation

selenium-webdriver

testng-eclipse

解决方案：