How to click OK in alert box using protractor

Question

I am using AngularJS and I want to delete a link, in such cases, an alert box appears to confirm the delete.

I am trying to do e2e test using protractor, how do I confirm in an alert box?

I tried:

browser.switchTo().alert().accept()

but it doesn't seem to work.

Is there a provision in protractor for handling alert boxes?