在selenium中循环一个try和catch语句

Question

我的移动仿真器测试的设置有问题。

基本上，我有一个移动设备列表，我可以使用它在手机上运行我的selenium测试。这些设备是一个设备池，任何为该服务付费的人都可以使用这些设备，因此这些设备有时可能正在使用，这将创建一个会话，而不是创建的exception.The问题是，我正在使用try/catch来确保如果一个设备不可用，则可以使用另一组设备功能。我遇到的问题是，有时这两种设备都在使用，而测试却被忽略了。这是我目前的代码：

@BeforeClass
public void setup()throws Exception{

    //Setup a mobile device on Kobiton, if this one is not available, the next one will be used

        try {
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxyss7());

        } catch (SessionNotCreatedException e) {
            System.out.println("Secondary device being used");
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxys7());
        }

}

我使用以下代码进行绑定，但不允许(！完成)

boolean done = false;
while (!done) {
try {
    ...
    done = true;
} catch (...) {
}
}

我试过这样的循环，但什么也没发生

    @BeforeClass
    public void setup()throws Exception{

        boolean done = false;
        while (!done)
    try {
        this.driver = new RemoteWebDriver (config.kobitonServerUrl(), 
config.desiredCapabilitites_galaxyss7());
        done = true;

    } catch (SessionNotCreatedException e){
        System.out.println("Secondary device being used");
        this.driver = new RemoteWebDriver (config.kobitonServerUrl(), 
config.desiredCapabilitites_galaxys7());
        done = true;

    }

}

我也试过

public class how_to_play_test {

    private RemoteWebDriver driver = null;

@BeforeClass
public void setup()throws Exception{

    int max_attempts = 10;
    int attempts = 0;
    boolean done = false;
    while (attempts<max_attempts && !done) {
        try {
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxyss7());
            done = true;

        } catch (SessionNotCreatedException e) {
            System.out.println("Secondary device being used");
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxys7());
            done = true;

        }
        attempts ++;
    }

}

全试验

public class how_to_play_skip_test  {

private RemoteWebDriver driver = null;

@BeforeClass
public void setup()throws Exception{

    int max_attempts = 10;
    int attempts = 0;
    boolean done = true;
    while ((max_attempts > attempts) && !done) {
        try {
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxyss7());
            done = true;

        } catch (SessionNotCreatedException e) {
            System.out.println("Secondary device being used");
            this.driver = new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxys7());
            done = true;

        }
        attempts ++;
    }

}
    @Test(priority=1)
    public void how_to_play_skip_test_android() throws Exception {

        driver.get("https://baseball-game-stage.com/howtoplay#howtoplay");
        Thread.sleep(10000);
        WebDriverWait wait = new WebDriverWait(driver, 10);
        WebElement howto = driver.findElement(By.xpath("/html/body/aside/div/div[2]/div/div[1]/div[1]/div/div/div[1]/div/section/h2"));

        wait.until(ExpectedConditions.visibilityOf(howto));
        System.out.println("How to is displayed");
        String how = driver.findElement(By.xpath("/html/body/aside/div/div[2]/div/div[1]/div[1]/div/div/div[1]/div/section/p")).getText();
        //String how = how_to_play_text_element.getText();

        System.out.println(how);

        WebElement next = driver.findElement(By.cssSelector("[data-qa-action-button]"));
        next.click();

        driver.findElement(By.xpath("/html/body/aside/div/div[2]/div/div[1]/div[1]/div/div/div[2]/div/section/h2")).isDisplayed();
        System.out.println("Game Picks is displayed");

        String game_picks_text = driver.findElement(By.xpath("/html/body/aside/div/div[2]/div/div[1]/div[1]/div/div/div[2]/div/section/p")).getText();

        System.out.println(game_picks_text);

        Thread.sleep(3000);

        next.click();

        String submit_text = driver.findElement(By.xpath("/html/body/aside/div/div[2]/div/div[1]/div[1]/div/div/div[3]/div/section/p")).getText();
        Assert.assertEquals("Complete your selections and submit your picks. Follow your progress on the big screen leaderboard.", submit_text);
        System.out.println(submit_text);
        WebElement finish = driver.findElement(By.cssSelector("[data-qa-action-button='finish']"));
        finish.click();
        Thread.sleep(3000);
    }





    @AfterClass
    public void tear_down ()throws Exception {

        driver.quit();

    }
}

Answer 1

在您的代码中至少有两个问题：

1. 您的if条件永远不会满足，因为您设置了done = true。
2. 您还需要捕获第二个SessionNotCreatedException才能重试。

代码

这是一个固定的例子。如您所见，我创建了一个单独的方法来处理设备选择。当第一设备正在使用时，异常将被处理，第二设备将被使用。如果第二个设备也被使用，SessionNotCreatedException将被抛出，并且必须从调用方捕获。在catch块中，您可以添加等待，因为该设备可能仍在使用一段时间。

public class how_to_play_skip_test {

    private RemoteWebDriver driver = null;
    private static final int MAX_ATTEMPTS = 10;

    @BeforeClass
    public void setup()throws Exception{

        int attempts = 0;
        boolean done = false;

        while ((MAX_ATTEMPTS > attempts) && !done) {
            try {
                this.driver = getDriver(config.desiredCapabilitites_galaxyss7());
                done = true;
            } catch (SessionNotCreatedException e) {
                System.out.println("Trying again...");
                //Maybe wait here some time?
            }
            attempts ++;
        }
    }

    private RemoteWebDriver getDriver() throws SessionNotCreatedException {
        if(capabilities == null){
            throw new IllegalArgumentException("Capabalities must not be null");
        }

        try {
            return new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxyss7());
        } catch(SessionNotCreatedException ex){
            System.out.println("Secondary device being used");
            return new RemoteWebDriver(config.kobitonServerUrl(), config.desiredCapabilitites_galaxys7())           
        }        
    }

    ...
}

提示

如果您想使用两个以上的设备，您应该考虑一种更动态的方法，例如通过一个包含每个设备功能的列表来循环。

如果您混淆了一段时间或条件，您可以尝试使它们更容易理解(否定布尔值，删除布尔值，.)。

这里有一个没有done变量的示例：

int max_attempts = 10;
int attempts = 0;

while(attempts < MAX_ATTEMPTS){
  try{
     //do something
     attempts += MAX_ATTEMPS; //done
  }catch(Exception ex){
     //do something
  }
  attempts++;
}