我试图用groovy为Swagger页面编写Selenium对象构建器。为了便于讨论，我的问题代码可以简化为以下几种：

class SwaggerBuilder {

    WebDriver driver
    def resources

    SwaggerBuilder(WebDriver driver) {

        this.driver = driver

        Thread.sleep(2000)

        resources = driver.findElements(By.className("resource")).collectEntries {
            def resourceName = it.findElement(By.tagName("a")).getText().replaceFirst("[/]", "")
            [(resourceName): it]
        }
    }

    Object invokeMethod(String name, Object args) {

        if(resources[(name)] == null)
            throw new NoSuchElementException("Resource $name cannot be found.")

        resources[(name)].findElement(By.linkText("List Operations")).click()
    }
}

调用它非常简单（来自JUnit3）：

void test1() {

    driver = new FirefoxDriver()
    driver.get("http://petstore.swagger.wordnik.com/")

    def petstore = new SwaggerBuilder(driver)    // problem does not get past this line!
    try {
        petstore.not_there()
        fail("Did not catch exception.")
    } catch(NoSuchElementException ex) {
        assertTrue(ex.message.startsWith("Resource not_there cannot be found."))
    } catch(Exception ex) {
        fail("Caught wrong exception: ${ex.class}.")
    }
}

该Thread.sleep(2000)构造函数是一个可怕的眼睛痛！我试图用以下等待替换它：

def wait = new WebDriverWait(driver, 20)
wait.until(ExpectedConditions.visibilityOfElementLocated(By.className("resource")))

要么：

    def wait = new FluentWait<By>(By.className("resource")).
            withTimeout(20, TimeUnit.SECONDS).
            pollingEvery(100, TimeUnit.MILLISECONDS).
            ignoring(StaleElementReferenceException)
    wait.until(new Function<By, Boolean>() {
                def count = 0
                @Override
                Boolean apply(By by) {
                    def oldCount = count
                    count = driver.findElements(by).size()
                    return count == oldCount
                }
            })

两者都产生了相同的结果：以开头的行中的闭包中的“
org.openqa.selenium.StaleElementReferenceException：元素不再连接到DOM” def resourceName = ...。

这Thread.sleep(2000)是我现在可以进行此工作的唯一方法。我希望将其替换为对浏览器更友好/更可靠的等待，因此即使对于加载速度低于2秒的页面也可以使用。还有其他想法吗？