[i_like_apis]

While I have not used Playwright (but have a lot of experience with Se), I would say the code style is refreshing:

    // Expect an element "to be visible".
    await expect(page.locator('text=Learn more').first()).toBeVisible();

Writing await for every action makes the timeout of the action seem more explicitly declared. There seems to be more granular control of timeouts as well https://playwright.dev/docs/test-timeouts

> I don't know if it's Selenium specifically or some problem with the .NET binding

If the execution in .NET is slow then I suppose it could be .NET. But it could be (and often is) the suite design. You must wait for /everything/ before interacting with it because the code execution is quicker than the page.

Large Se/Webdriver suites are often a PIA. I find it's nice to write them with Python or Ruby so they can be debugged interactively with the an interactive shell.

[naasking]

> If the execution in .NET is slow then I suppose it could be .NET. But it could be (and often is) the suite design. You must wait for /everything/ before interacting with it

That's what I do, but the wait for an element in certain tests times out after a few minutes, even though the elements are clearly visible, and manual use never has an issue.

From other comments it sounds like Puppeteer and Playwright are better on this, so will look into switching.

[gmokki]

When I fixed many similar selenium/webdriver tests the root cause was always the same: You grab reference to an element and for example wait it to become enabled or some text to appear. But your ui framework actually replaces the element in the dom while doing its thing and your reference to stale element will never change. Fix is to loop searching the element with selector and check if the element fills the conditions. If not, retry from search again. We had nice helpers for those and had very stable selenium tests.

[naasking]

> Fix is to loop searching the element with selector and check if the element fills the conditions. If not, retry from search again. We had nice helpers for those and had very stable selenium tests.

Thanks, I'll double check, but I think we do this now. In looking at the history of test failures, those failures are indeed less common, but still plenty of false positives of other types. Most persistent recent failures are the WebDriver timing out when loading a URL, which has never happened while manual testing or when being used by end users, so not sure what's going on there.

In any case, if the Playwright API encourages better idioms for writing tests that avoids these pitfalls, that would be cool because I deal with a lot of work term students that aren't adept at this kind of stuff so that would save a lot of headaches.

[masklinn]

In my experience an other common issue is a race condition in the trigger, aka the system is not quite settled yet when an interaction is performed leading to that not registering.

This is more likely when the system is loaded / shared e.g. a CI Vm.

It’s instructive to watch a screencast / recording of UI tests, because you don’t necessary intuit how spazzy and fast the harness will perform its interactions.