无法通过 TestNG 执行测试用例

Question

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

    public class TestNG {
        public WebDriver driver;

  @Test
      public void main() throws Exception {
      driver.findElement(By.id("account")).click();
      driver.findElement(By.id("log")).sendKeys("********");
      driver.findElement(By.id("pwd")).sendKeys("*****");
      driver.findElement(By.id("login")).click();
      System.out.println("Login Successfully :-)");
      driver.findElement(By.id("account_logout")).click();
      Thread.sleep(15000);
  }
  @BeforeMethod
      public void beforeMethod() {
      System.setProperty("webdriver.chrome.driver", "D:\\chromedriver_win32 (1)\\chromedriver.exe");
      WebDriver driver = new ChromeDriver();
      driver.manage().window().maximize();
      driver.get("http://store.demoqa.com/");
  }

  @AfterMethod
      public void afterMethod() {
      driver.quit();
  }
}

@BeforeMethod 成功运行并启动了指定网站，但在网站打开后，它应该向主要功能即 @BeforeMethod 移动，但无法进一步移动。 请告诉我，代码有问题吗。

我们得到以下错误：-

[TestNG] 运行：

C:\Users\gmohammad\AppData\Local\Temp\testng-eclipse--1784470156\testng-customsuite.xml

Starting ChromeDriver 2.21.371459 (36d3d07f660ff2bc1bf28a75d1cdabed0983e7c4) on port 6093
Only local connections are allowed.
FAILED CONFIGURATION: @AfterMethod afterMethod
java.lang.NullPointerException
    at com.ghulam.TestNG.afterMethod(TestNG.java:33)
    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:85)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:510)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:211)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:703)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
    at org.testng.TestRunner.privateRun(TestRunner.java:774)
    at org.testng.TestRunner.run(TestRunner.java:624)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
    at org.testng.SuiteRunner.run(SuiteRunner.java:261)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1215)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
    at org.testng.TestNG.run(TestNG.java:1048)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58)

FAILED: f
java.lang.NullPointerException
    at com.ghulam.TestNG.f(TestNG.java:15)
    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:85)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
    at org.testng.TestRunner.privateRun(TestRunner.java:774)
    at org.testng.TestRunner.run(TestRunner.java:624)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
    at org.testng.SuiteRunner.run(SuiteRunner.java:261)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1215)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
    at org.testng.TestNG.run(TestNG.java:1048)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58)


===============================================
    Default test
    Tests run: 1, Failures: 1, Skips: 0
    Configuration Failures: 1, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 1, Failures: 1, Skips: 0
Configuration Failures: 1, Skips: 0
===============================================

[TestNG] Time taken by org.testng.reporters.JUnitReportReporter@1a18493: 24 ms
[TestNG] Time taken by org.testng.reporters.jq.Main@c0f91d: 148 ms
[TestNG] Time taken by org.testng.reporters.XMLReporter@de4588: 39 ms
[TestNG] Time taken by org.testng.reporters.EmailableReporter2@354949: 15 ms
[TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@19b622d: 123 ms
[TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 21 ms

Answer 1

试试下面的代码..

我猜这是因为在您的 @BeforeMethod 方法中再次声明驱动程序使驱动程序对象成为该方法本身的本地对象。

注意：- 尝试执行您的代码，它在"driver.findElement(By.id("account_logout")).click();" 再次失败。请更正此问题并再次运行，它会起作用。

package testcases;

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

public class TestNG {
    public WebDriver driver;

    @Test
    public void main() throws Exception {
        driver.findElement(By.id("account")).click();
        driver.findElement(By.id("log")).sendKeys("********");
        driver.findElement(By.id("pwd")).sendKeys("*****");
        driver.findElement(By.id("login")).click();
        System.out.println("Login Successfully :-)");
        driver.findElement(By.id("account_logout")).click();
        Thread.sleep(15000);
    }

    @BeforeMethod
    public void beforeMethod() {
        System.setProperty("webdriver.chrome.driver", "E:\\chromedriver.exe");
        driver = new ChromeDriver();
        driver.manage().window().maximize();
        driver.get("http://store.demoqa.com/");
    }

    @AfterMethod
    public void afterMethod() {
        driver.quit();
    }
}