Question

我是Selenium的新手，在运行下面的脚本时，我得到空指针异常，并且一旦站点调用加载，测试就会停止运行。我无法理解异常的原因。

代码如下：

package TestNGPackage;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.support.ui.*;
import org.openqa.selenium.firefox.*;
import org.openqa.selenium.*;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeTest;

public class ParameterizationTest {
WebDriver driver;
  @Test(dataProvider="getdata")
  public void Login(String Username, String Password) 
  {
    //WebDriverWait wait= new WebDriverWait(driver,60);
    //WebElement username= wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("username")));
    WebElement username=driver.findElement(By.id("username"));
        WebElement password= driver.findElement(By.id("password"));
        username.sendKeys(Username);
        password.sendKeys(Password);
        WebElement SignIn= driver.findElement(By.tagName("button"));
        String text = SignIn.getText();
        if (text.equalsIgnoreCase("sign in")) {
            // sign in btn
            SignIn.submit();
        }
  }

  @DataProvider(name="getdata")
  public Object[][] testgetdata()
  {
      Object[][] data = new Object[3][2];
      //row1
      data[0][0]="ho@abc.com";
      data[0][1]="welcome23";
      //row2
      data[1][0]="ho@baskin.com";
      data[1][1]="welcome23";
      //row3
      data[2][0]="ho@nike.com";
      data[2][1]="welcome23";

      return data;
  }

  @BeforeMethod
  public void beforeTest() {
      WebDriver driver = new FirefoxDriver();

      driver.get("http://52.25.202.63/illweb/");
    //  driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);

  }

  @AfterMethod
  public void AfterTest() {
      //driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
        WebElement logout = driver.findElement(By.linkText("Logout"));
        logout.click();
        //driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
        driver.close();

  }
}

我收到以下错误：

[TestNG]正在运行： C：\ Users \用户Ronit \应用程序数据\本地的\ Temp \ TestNG的月食 - 473949223 \ TestNG的-customsuite.xml [Utils]试图创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ Default suite \ Default test.xml [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \默认套件存在：true FAILED CONFIGURATION：@AfterMethod AfterTest 显示java.lang.NullPointerException 在TestNGPackage.ParameterizationTest.AfterTest（ParameterizationTest.java:60） 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:100） at org.testng.internal.Invoker.invokeConfigurationMethod（Invoker.java:515）在org.testng.internal.Invoker.invokeConfigurations（Invoker.java:216）在org.testng.internal.Invoker.invokeMethod（Invoker.java:712）在org.testng.internal.Invoker.invokeTestMethod（Invoker.java:811） at org.testng.internal.Invoker.invokeTestMethods（Invoker.java:1129） at org.testng.internal.TestMethodWorker.invokeTestMethods（TestMethodWorker.java:129）在org.testng.internal.TestMethodWorker.run（TestMethodWorker.java:112）在org.testng.TestRunner.privateRun（TestRunner.java:746）在org.testng.TestRunner.run（TestRunner.java:600）在org.testng.SuiteRunner.runTest（SuiteRunner.java:366） at org.testng.SuiteRunner.runSequentially（SuiteRunner.java：361）在org.testng.SuiteRunner.privateRun（SuiteRunner.java:319）在org.testng.SuiteRunner.run（SuiteRunner.java:268）在org.testng.SuiteRunnerWorker.runSuite（SuiteRunnerWorker.java:52）在org.testng.SuiteRunnerWorker.run（SuiteRunnerWorker.java:86） at org.testng.TestNG.runSuitesSequentially（TestNG.java:1264）在org.testng.TestNG.runSuitesLocally（TestNG.java:1189）在org.testng.TestNG.runSuites（TestNG.java:1104）在org.testng.TestNG.run（TestNG.java:1076） at org.testng.remote.AbstractRemoteTestNG.run（AbstractRemoteTestNG.java:126）在org.testng.remote.RemoteTestNG.initAndRun（RemoteTestNG.java:152）在org.testng.remote.RemoteTestNG.main（RemoteTestNG.java:57） SKIPPED CONFIGURATION：@BeforeMethod beforeTest SKIPPED CONFIGURATION：@AfterMethod AfterTest SKIPPED CONFIGURATION：@BeforeMethod beforeTest SKIPPED CONFIGURATION：@AfterMethod AfterTest 失败：登录（＆＃34; manjeet@wtechspaces.in"，＆＃34; p @ ssw0rd＆＃34;）显示java.lang.NullPointerException 在TestNGPackage.ParameterizationTest.Login（ParameterizationTest.java:20） 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:100） at org.testng.internal.Invoker.invokeMethod（Invoker.java:646）在org.testng.internal.Invoker.invokeTestMethod（Invoker.java:811） at org.testng.internal.Invoker.invokeTestMethods（Invoker.java:1129） at org.testng.internal.TestMethodWorker.invokeTestMethods（TestMethodWorker.java:129）在org.testng.internal.TestMethodWorker.run（TestMethodWorker.java:112）在org.testng.TestRunner.privateRun（TestRunner.java:746）在org.testng.TestRunner.run（TestRunner.java:600）在org.testng.SuiteRunner.runTest（SuiteRunner.java:366） at org.testng.SuiteRunner.runSequentially（SuiteRunner.java：361）在org.testng.SuiteRunner.privateRun（SuiteRunner.java:319）在org.testng.SuiteRunner.run（SuiteRunner.java:268）在org.testng.SuiteRunnerWorker.runSuite（SuiteRunnerWorker.java:52）在org.testng.SuiteRunnerWorker.run（SuiteRunnerWorker.java:86） at org.testng.TestNG.runSuitesSequentially（TestNG.java:1264）在org.testng.TestNG.runSuitesLocally（TestNG.java:1189）在org.testng.TestNG.runSuites（TestNG.java:1104）在org.testng.TestNG.run（TestNG.java:1076） at org.testng.remote.AbstractRemoteTestNG.run（AbstractRemoteTestNG.java:126）在org.testng.remote.RemoteTestNG.initAndRun（RemoteTestNG.java:152）在org.testng.remote.RemoteTestNG.main（RemoteTestNG.java:57）跳过：登录（＆＃34; ho@baskin.com" ;,＆＃34; welcome123＆＃34;） SKIPPED：登录（＆＃34; ho@nike.com" ;,＆＃34; welcome123＆＃34;） =============================================== 默认测试测试运行：3，失败：1，跳过：2 配置失败：1，跳过：4 =============================================== =============================================== 默认套件总测试运行：3，失败：1，跳过：2 配置失败：1，跳过：4 =============================================== [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ testng-failed.xml [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ Default suite \ testng-failed.xml [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \默认套件存在：true [TestNG] [FailedReporter传递= 0失败= 0跳过= 0]所花费的时间：36毫秒 [TestNG] org.testng.reporters.XMLReporter@5594a1b5所花费的时间：30毫秒 [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ junitreports \ TEST-TestNGPackage.ParameterizationTest.xml [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ junitreports存在：true [TestNG] org.testng.reporters.JUnitReportReporter@3f3afe78所花费的时间：15毫秒 [TestNG] org.testng.reporters.jq.Main@1cd072a9所花费的时间：228毫秒 [TestNG] org.testng.reporters.EmailableReporter2@34ce8af7所花费的时间：8毫秒 [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ toc.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ Default test.properties [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]试图创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ index.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]试图创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ main.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ groups.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ classes.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ reporter-output.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]试图创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ methods-not-run.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ Default suite \ testng.xml.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \默认套件存在：true [Utils]尝试创建C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old \ index.html [Utils]目录C：\ Users \ Ronit \ workspace \ FirstTestNGProject \ test-output \ old exists：true [TestNG] org.testng.reporters.SuiteHTMLReporter@6b71769e所花费的时间：58 ms

请帮助我解决我的错误，提前致谢！

Answer 1

您发现NullPointerException导致驱动程序在该点之前未初始化。您尝试在beforeTest（）方法中初始化WebDriver实例，但它是本地的。要解决此问题，只需在beforeTest（）方法中初始化该WebDriver，而不必重新声明为：

driver = new FirefoxDriver();

不是

WebDriver driver = new FirefoxDriver();

第二个NullPointerExpception是由于同样的原因引起的。

使用TestNG

1 个答案: