当执行下面的代码时,会发生空指针异常,因为类Pom_MainHerokuapp的驱动程序始终为null
测试用例:-
package testcases;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.Test;
import poms.Pom_MainHerokuapp;
import testbase.TestBase;
public class MainHerokuapp extends TestBase {
Pom_MainHerokuapp mainHerokuappObject;
public MainHerokuapp() {
mainHerokuappObject = new Pom_MainHerokuapp(driver);
}
@Test(priority = 0)
public void TestMainpagetitle() {
mainHerokuappObject.VerifyTitles();
}
@Test(priority = 1)
public void TestABTestingText() {
mainHerokuappObject.VerifyTextOfABTesting();
}
}
TestBase类: -
package testbase;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.BeforeTest;
public class TestBase {
public WebDriver driver;
@BeforeTest
public void setup() {
driver = new FirefoxDriver();
driver.get("https://the-internet.herokuapp.com/");
driver.manage().window().maximize();
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
}
}
也:
package poms;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;
import org.testng.Assert;
public class Pom_MainHerokuapp {
public WebDriver driver;
String text;
String StringMaintext;
String Stringsubtitle;
@FindBy(xpath = "//html//body//div[2]//div//h1")
WebElement Maintitle;
@FindBy(xpath = "//html//body//div[2]//div//h2")
WebElement Subtitle;
@FindBy(linkText = "A/B Testing")
WebElement ABTesting;
@FindBy(xpath = "//html//body//div[2]//div//div//h3")
WebElement ABTestingText;
create constructor of this class
public Pom_MainHerokuapp(WebDriver driver) {
this.driver = driver;
PageFactory.initElements(driver, this); // Initialization all webelements
}
public void VerifyTitles() {
StringMaintext = Maintitle.getText();
Stringsubtitle = Subtitle.getText();
System.out.println(StringMaintext);
System.out.println(Stringsubtitle);
Assert.assertEquals(StringMaintext, "Welcome to the Internet");
Assert.assertEquals(Stringsubtitle, "Available Examples");
}
public void VerifyTextOfABTesting() {
ABTesting.click();
text = ABTestingText.getText();
System.out.println(text);
Assert.assertEquals(text, "A/B Test Variation 1");
}
}
错误是: -
FAILED:在org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java)的org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)上的TestMainpagetitle java.lang.NullPointerException :38)在com.sun.proxy . $ Proxy7.getText(未知来源)at poms.Pom_MainHerokuapp.VerifyTitles(Pom_MainHerokuapp.java:36)at testcases.MainHerokuapp.TestMainpagetitle(MainHerokuapp.java:28)at sun.reflect.NativeMethodAccessorImpl位于org.testng.internal的java.lang.reflect.Method.invoke(未知来源)sun.reflect.DelegatingMethodAccessorImpl.invoke(未知来源)的sun.reflect.NativeMethodAccessorImpl.invoke(未知来源)的.invoke0(本地方法) .MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)org.testng.internal.InvokeMethod(Invoker.java:639)org.testng.internal.InvokeTestMethod(Invoker.java:816)org.testng . internal.Invoker.invokeTestMethods(Invoker.java:1124)at或g.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)org.testng.inest.TestMethodWorker.run(TestMethodWorker.java:108)atg.testng.TestRunner.privateRun(TestRunner.java:774)org . orng.TestRunner.run(TestRunner.java:624)org.testng.SuiteRunner.runTest(SuiteRunner.java:359)org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)atg.testng.SuiteRunner . privateRun(SuiteRunner.java:312)org.testng.SuiteRunner.run(SuiteRunner.java:261)org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java) :86)org.testng.TestNG.runSuitesSequentially(TestNG.java:1215)atg.testng.TestNG.runSuitesLocally(TestNG.java:1140)org.testng.TestNG.run(TestNG.java:1048)org org.testng.remote上的org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)中的.testng.remote.RemoteTestNG.run(RemoteTestNG.java:112).RemoteTestNG.main(RemoteTestNG.java:176)FAILED :TestABTestingText jav Org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)中的a.lang.NullPointerException位于org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)at at com.sun.proxy . $ Proxy7.click(未知来源)at poms.Pom_MainHerokuapp.VerifyTextOfABTesting(Pom_MainHerokuapp.java:46)at testcases.MainHerokuapp.TestABTestingText(MainHerokuapp.java:33)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native方法)在sun.reflect.NativeMethodAccessorImpl.invoke(未知来源)处于or.jpg.invokeHelper.invokeMethod的java.lang.reflect.Method.invoke(未知来源)的sun.reflect.DelegatingMethodAccessorImpl.invoke(未知来源) (MethodInvocationHelper.java:85)org.testng.internal.InvokeModod(Invoker.java:639)org.testng.internal.InvokeTestMethod(Invoker.java:816)org.testng.internal.Invoker的org.testng.internal.Invoker.invokeMethod(Invoker.java:639) . 在org.testng.internal.TestMe上调用TestMethods(Invoker.java:1124) thodWorker.invokeTestMethods(TestMethodWorker.java:125)org.testng.TestMethodWorker.run(TestMethodWorker.java:108)org.testng.TestRunner.privateRun(TestRunner.java:774)atg.testng.TestRunner.run (testRunner.java:624)org.testng.SuiteRunner.runTest(SuiteRunner.java:359)org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)atg.testng.SuiteRunner.privateRun(SuiteRunner.java: 312)org.testng.SuiteRunner.run(SuiteRunner.java:261)org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)atg.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)at org . testg.TestNG.runSuitesSequentially(TestNG.java:1215)org.testng.TestNG.runSuitesLocally(TestNG.java:1140)org.testng.TestNG.run(TestNG.java:1048)atg.testng.remote.RemoteTestNG .run(RemoteTestNG.java:112)org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)atg.testng.remote.RemoteTestNG.main(RemoteTestNG.java:176)
2 回答
这不难解释 . 测试类
MainHerokuapp
的默认构造函数将在运行时立即调用,即driver
仍然为空时 - 在@BeforeTest
方法之前,其中driver
已设置 .似乎是
MainHerokuapp
和TestBase
混合而不是明确的分离,所以你最好将它们合并为一个 .另一种方法是通过删除构造函数,在那里移动
@BeforeTest
并调用父类来恢复对子类的控制 . 这肯定有效:当我没有提到静态时我也得到了同样的错误但是当我在TestBase类中编写 public static WebDriver driver = null; 时它工作正常 .