TestNG并发兼容性测试

package com.selenium;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
import org.testng.annotations.Parameters;
import org.testng.annotations.BeforeClass;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.Test;

public class TestNGBingfa {  
    WebDriver driver;
    
    @Parameters("browser")
    @BeforeClass
    public void BeforeClass(String Browser){
        //判断Browser等于chrome。equalsIgnoreCase()方法比较两个字符串是否相等（不区分大小写）
        if(Browser.equalsIgnoreCase("chrome")){
            System.setProperty("webdriver.chrome.driver","E:\\chromedriver.exe");
            driver=new ChromeDriver();
        }
        else if(Browser.equalsIgnoreCase("firefox")){
            System.setProperty("webdriver.firefox.bin","D:\\Firefox\\firefox.exe");
            driver=new FirefoxDriver();
        }
        else{
            System.setProperty("webdriver.ie.driver", "E:\\IEDriverServer.exe");
            driver=new InternetExplorerDriver();
        }
    }
    
    @Test
    public void test() throws InterruptedException{
        driver.get("https://www.baidu.com");
        driver.findElement(By.xpath("//*[@id=‘kw‘]")).sendKeys("selenium");
        driver.findElement(By.xpath("//*[@id=‘su‘]")).click();    
        //获取页面上的资源
        String sourcetext=driver.getPageSource();
        //校验搜索结果是否包含 selenium
        Assert.assertTrue(sourcetext.contains("selenium"));
    }
    
    @AfterClass
    public void Aftercalss(){
        driver.quit();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite" parallel="tests" thread-count="3">

  <!-- 谷歌浏览器 -->
  <test name="chrome">
    <parameter name="browser" value="chrome"></parameter>
    <classes>
      <class name="com.selenium.TestNGBingfa"/>
    </classes>
  </test>

   <!-- 火狐浏览器 -->
  <test name="firefox">
   <parameter name="browser" value="firefox"></parameter>
   <classes>
     <class name="com.selenium.TestNGBingfa"></class>
   </classes>
  </test>

  <!-- IE浏览器 -->
  <test name="ie">
   <parameter name="browser" value="ie"></parameter>
   <classes>
     <class name="com.selenium.TestNGBingfa"></class>
   </classes>
  </test>

</suite>