我面临着一个奇怪的问题 . 在写这篇文章之前，我已经对此做了一些研究，但无法解决这个问题 .

我正在传递参数，但它采用参数的默认值，即“无值” .

这是我的代码

package rough;

import org.testng.annotations.AfterMethod;

import org.testng.annotations.Optional;

import org.testng.annotations.Parameters;

import org.testng.annotations.Test;

import org.testng.annotations.BeforeMethod;

import org.testng.Assert;

import java.util.regex.Pattern;

import java.util.concurrent.TimeUnit;

import org.junit.*;

import static org.hamcrest.CoreMatchers.*;

import org.openqa.selenium.*;

import org.openqa.selenium.chrome.ChromeDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.openqa.selenium.ie.InternetExplorerDriver;

import org.openqa.selenium.support.ui.Select;

public class Browsers {

private WebDriver driver;

private String baseUrl;

private boolean acceptNextAlert = true;

private StringBuffer verificationErrors = new StringBuffer();

@BeforeMethod

public void tearDown1() throws Exception {

System.out.println("Hello starting");

}

@Test

@Parameters({ "BROWSER" })

public void setUp(@Optional String BROWSER) throws Exception {

if(BROWSER.equalsIgnoreCase("FF"))

{

driver = new FirefoxDriver();

}

else

if(BROWSER.equalsIgnoreCase("IE"))

{

System.setProperty("webdriver.ie.driver", "g:/Selenium Jar Files/IEDriverServer.exe");

driver = new InternetExplorerDriver();

}

baseUrl = "http://book.theautomatedtester.co.uk/";

driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);

System.out.println("Hello starting1111");

driver.get(baseUrl+"/chapter1");

driver.findElement(By.id("radiobutton")).click();

Select(driver.findElement(By.id("selecttype"))).selectByVisibleText("Selenium RC");

}

@AfterMethod

public void tearDown() throws Exception {

String verificationErrorString = verificationErrors.toString();

if (!"".equals(verificationErrorString)) {

Assert.fail(verificationErrorString);

}

}

private boolean isElementPresent(By by) {

try {

driver.findElement(by);

return true;

} catch (NoSuchElementException e) {

return false;

}

}

private boolean isAlertPresent() {

try {

driver.switchTo().alert();

return true;

} catch (NoAlertPresentException e) {

return false;

}

}

private String closeAlertAndGetItsText() {

try {

Alert alert = driver.switchTo().alert();

String alertText = alert.getText();

if (acceptNextAlert) {

alert.accept();

} else {

alert.dismiss();

}

return alertText;

} finally {

acceptNextAlert = true;

}

}

}

这里使用的XML是

当我运行代码时出现此错误：

[TestNG] Running:

C:\Users\Administrator\AppData\Local\Temp\testng-eclipse-2137105747\testng-customsuite.xml

Hello starting

FAILED: setUp("not-found")

java.lang.NullPointerException

at rough.Browsers.setUp(Browsers.java:55)

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:84)

at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)

at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)

at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)

at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)

at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)

at org.testng.TestRunner.privateRun(TestRunner.java:767)

at org.testng.TestRunner.run(TestRunner.java:617)

at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)

at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)

at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)

at org.testng.SuiteRunner.run(SuiteRunner.java:240)

at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)

at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)

at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)

at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)

at org.testng.TestNG.run(TestNG.java:1057)

at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)

at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)

at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)