Using in cucumber - multiple scenarii

[LovaTahina]

Hi,

I am using thirtyfour with cucumber and I need a help to deal with multithread.
I try to keep Webdriver into World struct like this (since I do not want to reopen web session for each scenario)

#[derive(World)]
pub struct Connection {
    url: Option<String>,
    driver: Arc<Option<Box<WebDriver>>>,
}

impl Connection {
    pub fn setDriver(&mut self, d: &Arc<Option<Box<WebDriver>>>) {
        self.driver = Arc::clone(&d);
    }
}

impl Default for Connection {
    fn default() -> Self {
        Connection {
            url: None,
            driver: Arc::new(None),
        }
    }
}

impl fmt::Debug for Connection {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Connection")
            .field("url", &self.url)
            .finish()
    }
}

But I do not get it working well when entering the next scenario. I pass Webdriver like this:

async fn main() -> WebDriverResult<()> {
    
    let mut caps = DesiredCapabilities::chrome();
    caps.set_ignore_certificate_errors();
    let dr = WebDriver::new("http://localhost:9515", caps).await?;
    let bx = Box::new(dr);
    let d = Arc::new(Some(bx));


    Connection::cucumber()
        .before(move |_feature, _rule, _scenario, _world| {
            _world.setDriver(&d);
            println!("driver set for next scenario");
            tokio::time::sleep(Duration::from_secs(2)).boxed_local()
        }).run("tests/features/portal.feature").await;

    Ok(())
}

I always have an error:
Step panicked. Captured output: no such element: XPath(//span[contains(text(), 'Settings')])

How to correctly clone WebDriver, how to use it in a multithread purpose?

[stevepryde]

Why are you trying to run this multithreaded? There's only 1 browser instance, and only 1 webdriver server, and it's stateful. So trying to execute commands from multiple threads is likely to land you in a world of pain.

The particular error you're seeing suggests there is no such span element on the page containing the given text, at the time when that command was executed.

Also you don't need to wrap WebDriver in an Arc because it already contains an Arc internally. If you clone it you'll get a handle to the same webdriver session anyway:

#[derive(Debug, Clone)]
pub struct WebDriver {
    /// The underlying session handle.
    pub handle: Arc<SessionHandle>,
}

The only way multiple threads will work for you is to use multiple browsers, which just means multiple WebDriver instances, completely independent from each other. Perhaps that's what you need. Instead of using Arc<WebDriver> - just create an entirely new WebDriver instance in each thread. Then make sure your selenium server can handle that many instances at once.

[stevepryde]

I would strongly suggest that the element you're searching for really isn't there at the time when that code is executed. Make the browser visible (not headless) and insert a long pause right before that line is executed. Then use the inspector to search for that xpath.

[stevepryde]

Using multiple threads is a separate issue. If you do want to run tests in parallel I'd strongly suggest using multiple browser instances (multiple WebDriver instances, one per thread)

[LovaTahina]

But the purpose of my test is to stay in the same web session. I don't want to run multiple browsers.
The only explanation of the issue is that cucumber reset a new World instance for each scenario, so I must pass webdriver instance by instance avoiding it to be clean/reset

[stevepryde]

Sure, but if one test goes to one URL and the next test goes to another URL the browser can't show both URLs at once. The page itself is stateful, so you can only have one test per browser at any given time.

[stevepryde]

If you want a single web session then you need to run your tests in series, not in parallel. Not sure if cucumber supports this. I've never used it.

Before each test you need something to force the browser to be back in the state needed for your test. Something like reloading the URL etc.