Protractor

Protractor is (in 2015) widely known as difficult to use. Here are some tips:

((JavascriptExecutor) driver).executeAsyncScript("angular.getTestability(document.querySelector('body')).whenStable(arguments[0])");

That will synchronously wait for Angular to finish whatever it's doing - digest cycle, animations, HTTP requests, etc. We make that call after every click on the app, and will hopefully remember to add it after every other event-triggering interaction we start using. So far, we haven't had to add any other explicit waits, and the tests are rock-solid.

Because that waits, we also had to set a global timeout on WebDriver:

driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS);

The other trick we've developed is to always filter the results of a query for elements by WebElement::isDisplayed. We have a lot of elements on hidden cached views, and it seems that findElements finds those even though they're not visible.

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