问无法使用带有Selenium/testNG的xpath节点获取yt频道名称

EN

import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import com.thoughtworks.selenium.DefaultSelenium;
import com.thoughtworks.selenium.SeleneseTestCase;
import com.thoughtworks.selenium.SeleniumException;


public class YT1 extends SeleneseTestCase{
@BeforeTest
public void beforeTest(){
System.out.println("Before");
selenium = new DefaultSelenium("localhost", 4444,"*firefox","http://www.youtube.com"); 
    selenium.start();
}

@Test
public void myTest() throws Exception{
    System.out.println("Test");
    selenium.open("/");
    selenium.type("//*[@id='masthead-search-term']", "qtp");
    selenium.click("//*[@id='search-btn']");
    Thread.sleep(3000);
    try {
    System.out.println(selenium.getText("//html/body/div[2]/div[4]/div/div[3]/div/div/div[2]/div[2]/div[2]/div[2]/ol/li[1]/div[2]/div/ul/li/a"));
    }
    catch (SeleniumException se1){
        System.out.println("Element not Found because: " + se1);
    }
    try {
    System.out.println(selenium.getText("//html/body/div[2]/div[4]/div/div[3]/div/div/div[2]/div[2]/div[2]/div[2]/ol/li[2]/div[2]/div/ul/li/a"));
        }
        catch (SeleniumException se2){
            System.out.println("Element not Found because: " + se2);
        }
    try {
        System.out.println(selenium.getText("//html/body/div[2]/div[4]/div/div[3]/div/div/div[2]/div[2]/div[2]/div[2]/ol/li[3]/div[2]/div/ul/li/a"));
        }
        catch (SeleniumException se3){
            System.out.println("Element not Found because: " + se3);
    }
}
@AfterTest
public void ShutDown(){
    System.out.println("After Test");
    selenium.close();
}