Bug 918970 - display existing thread when sending a sms from contact app

old PR : https://github.com/mozilla-b2g/gaia/pull/16216

I'm not sure of this. Actually I'm not sure of how it works now, and how it should work.

I think what you want to do is _spy_ toView. And in the test, you want to call toView.firstCall.returnValue.then(...)