I keep getting the following error on my tests:

Selenium::WebDriver::Error::WebDriverError:
       unexpected response, code=500, content-type=""
       Error: Error from waitForAngular: Failed to execute 'querySelectorAll' on 'Document': '[ng:app]' is not a valid selector.

I removed both trySelector('[ng:app]') and trySelector('[ng:controller]') in https://github.com/angular/blocking-proxy/blob/master/lib/client_scripts/wait.js#L111, and my tests are working now.

I don't know enough to say if those trySelector calls need to be there or not. But perhaps the method should also be surrounded by a try-catch like the tryEl method?