selenium webdriver + Junit 自动化测试：打开不同浏览器网页

1、整体代码：打开火狐浏览器页面
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class First {

WebDriver driver;

@Before
public void setUP(){
System.setProperty("webdriver.firefox.bin","E:\\Program Files\\Mozilla Firefox\\firefox.exe");
driver = new FirefoxDriver();
}

@Test
public void runTest(){