4.下载并安装 testng

　　testng和junit相比为什么要使用testng
　　1. testng 和junit功能基本相同testng支持suite，junit执行一大堆case，如果个别fail，只能所有case重跑
　　而testng可以单独跑
　　2.testng能生成漂亮的测试报告，比较直观
　　添加一个testng case，复制一份，保存为
　　openlinkTest1.java
package baidu;
import java.io.File;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import junit.framework.Assert;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.By;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
public class openlinkTest {
public static void snapshot(TakesScreenshot drivername， String filename)
{
// this method will take screen shot ，require two parameters ，one is driver name， another is file name
File scrFile = drivername.getScreenshotAs(OutputType.FILE);
// Now you can do whatever you need to do with it， for example copy somewhere
try {
System.out.println("save snapshot path is:E:/"+filename);
FileUtils.copyFile(scrFile， new File("E:\"+filename));
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("Can't save screenshot");
e.printStackTrace();
}
finally
{
System.out.println("screen shot finished");
}
}
@BeforeMethod
public void tearUp()
{
//    WebDriver driver = new ChromeDriver();
}
@Test
public static void runSelenium() throws InterruptedException
{
String URL="http://www.baidu.com";
Pattern p = Pattern.compile("http");
Matcher m = p.matcher(URL);
if(m.find())
{
System.out.println(URL);
}
System.setProperty("webdriver.chrome.driver"， "E:\chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.get(URL);
//max size the browser
driver.manage().window().maximize();
/*
Navigation navigation = driver.navigate();
navigation.to(URL);*/
Thread.sleep(2000);
snapshot((TakesScreenshot)driver，"open_baidu.png");
//WebElement reg=driver.findElement(By.name("tj_reg"));
//reg.click();
//    WebElement keyWord = driver.findElement(By.id("kw1"));
//find the element
WebElement keyWord = driver.findElement(By.xpath("//input[@id='kw1']"));
keyWord.clear();
//send key words
keyWord.sendKeys("Selenium");
Thread.sleep(3000);
snapshot((TakesScreenshot)driver，"input_keyWord.png");
WebElement submit = driver.findElement(By.id("su1"));
System.out.println(submit.getLocation());
submit.click();
//System.out.println(driver.getWindowHandle());
Thread.sleep(5000);
// System.out.println(driver.getPageSource());
String pageSource=driver.getPageSource();
//  System.out.println(pageSource);
//WebElement link =driver.findElement(By.xpath(SELENIUM_LINK));
WebElement link =driver.findElement(By.xpath("//*[@id="1"]/h3/a"));     //*[@id="1"]/h3/a
link.click();
Thread.sleep(5000);
driver.switchTo().window(driver.getWindowHandles().toArray(new String[0])[1]);
//get page title
System.out.println(driver.getTitle());
Thread.sleep(5000);
//     navigation.back();
snapshot((TakesScreenshot)driver，"open_bake.png");
System.out.println(driver.getTitle()+" "+driver.getCurrentUrl());
Assert.assertEquals(driver.getTitle()，"Selenium - Web Browser Automation");
driver.quit();
}
@AfterMethod
public void tearDown()
{
//driver.quit();
System.out.println("------------END----------------------");
}
}