Selenium Web驱动程序未执行拖放

Question

Selenium Web驱动程序未执行拖放操作，因此断言每次都会失败，因为在拖放可拖动项之后在拖放列表中找不到文本。我已经添加了可拖动项目，dropzone和放置列表的屏幕截图，有人可以建议我如何解决此问题吗？

//下面是类中的两个方法dragAnItem（）和dropItem（）；

function generateHtml(template, data){
  const rendered = new Vue({template, data}).$mount()
  return rendered.$el
}

// DragAndDropTest如下；

public class DragAndDrop {  
    WebDriver driver;

    public DragAndDrop(WebDriver driver){
        this.driver = driver;
    }

    public void dragAnItem(){
           //Element on which need to drag.
        WebElement source = driver.findElement(By.xpath("//div[@id='todrag']/span"));       
            //Element on which need to drop.        
        WebElement target =driver.findElement(By.id("mydropzone"));         
        try {
            Thread.sleep(5000);
            //Using Actions class for drag and drop.        
            Actions act = new Actions(driver);  
             //Using Action for Dragged and dropped.    
            Action dragAndDrop = act.clickAndHold(source)
                    .moveToElement(target)
                    .release(target)
                    .build();
                    dragAndDrop.perform();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public String droppedItem(){
        return driver.findElement(By.id("droppedlist")).getText();
        //return driver.findElement(By.xpath("//div[@id='droppedlist']")).getText();
    }



}