support for E2E testing

[Sarfarazsajjad]

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I am writing e2e protractor tests and I need to detect when the block ui appears and disappear, but I don't see any changes in css or html when the blocker appear or disappear. can you point to something that can be detected with protractor browser.wait something like this

browser.wait(result =>{ return element(by.className('spinner')).isPresent(); }, 20000);