Selenium (Java) - 一直单击按钮直到元素中出现特定文本，如果超过一定时间就会失败

Question

I have a scenario where I can stop an engine by clicking a button which starts a background process and I can see the current status of the engine every time only after clicking a Refresh Status button in the page. The issue is that the time varies for the engine to stop from 30 seconds to 2 mins depending upon the load on the server. I really don't want to write a while loop with Thread.sleep() as it's a bad idea and would unnecessarily increase the test time in selenium. Is there an intuitive way to wait 20 seconds every time and click the Refresh Status button until Offline text is present in the element and have a timeout of 3 mins for this whole process?

Answer 1

You can extend ExpectedConditions class and override static method textToBePresentInElementLocated if you would see the implementation is pretty much simple:

public static ExpectedCondition<Boolean> textToBePresentInElementLocated(
      final By locator, final String text) {

    return new ExpectedCondition<Boolean>() {
      @Override
      public Boolean apply(WebDriver driver) {
        try {
          String elementText = findElement(locator, driver).getText();
          return elementText.contains(text);
        } catch (StaleElementReferenceException e) {
          return null;
        }
      }

      @Override
      public String toString() {
        return String.format("text ('%s') to be present in element found by %s",
            text, locator);
      }
    };
  }

Just add element.click() in this method to a proper place and then use your class extended class in WebDriverWait

Answer 2

I would do something like this.

/**
 * Attempts to stop the engine within a specified time
 * 
 * @param driver 
 *            the WebDriver instance
 * @return true if the engine has stopped, false otherwise
 * @throws InterruptedException
 */
public boolean StopEngine(WebDriver driver) throws InterruptedException
{
    driver.findElement(By.id("stopEngineButton")).click(); // click the stop engine button

    boolean found = false;
    int i = 0;
    while (!found && i < 6) // 6 * 20s = 2 mins
    {
        Thread.sleep(20000);
        driver.findElement(By.id("RefreshStatus")).click(); // click the Refresh Status button
        // not sure if you need a wait here to let the statusElement update
        found = driver.findElement(By.id("statusElement")).getText().equals("Offline"); // compare the current engine status to Offline
        i++;
    }

    return found;
}

You could also modify this code to be more flexible by passing polling interval and timeout as parameters.