能够用硒定位框架，但不能与Junit Cucumber一起使用

Question

我能够使用selenium java程序找到一个框架。以下代码成功运行：

public static void TestCase() throws IOException, InterruptedException{ 


                WebDriver driver = new FirefoxDriver(); 
                driver.manage().window().maximize();  
                driver.get("website"); 


                driver.findElement(By.xpath("//*[@id='username']")).sendKeys(userName);
                driver.findElement(By.xpath("//*[@id='password']")).sendKeys("password");
                driver.findElement(By.xpath("//*[@id='session_link']")).click();    


                driver.findElement(By.xpath("//*[@id='app_236']/a")).click(); //Click a link on the page

                driver.switchTo().frame("iframe100-100"); //Switch to a frame within the new page

                driver.findElement(By.xpath("//*[@id='yui-gen0']/li[2]/div")).click(); //Click element within the frame
}

但是如果我使用Cucumber Junit maven项目运行相同的代码，程序将无法找到该框架。

@Given("^I log into website$")
    public void log_in()
    {
        WebDriver driver = new FirefoxDriver(); 
        driver.manage().window().maximize();  
        driver.get("website"); 

        driver.findElement(By.xpath("//*[@id='username']")).sendKeys(userName);
        driver.findElement(By.xpath("//*[@id='password']")).sendKeys("password");
        driver.findElement(By.xpath("//*[@id='session_link']")).click();    

    }

@When("^I select the link from homepage$")
    public void select_link() throws InterruptedException
    {
        driver.findElement(By.xpath("//*[@id='app_236']/a")).click();       
    }

@Then("^I should see something$")
    public void click_element_within_frame()
    {
        driver.switchTo().frame("iframe100-100"); //Switch to a frame within the new page

        driver.findElement(By.xpath("//*[@id='yui-gen0']/li[2]/div")).click(); //Click element within the frame
}

错误讯息：

31morg.openqa.selenium.NoSuchFrameException：无法找到frame：iframe100-100

有什么建议吗？