[5.2] Fix seeAuthenticatedAs

[sileence]

Fix bug when seeAuthenticatedAs is called with a different user object than the user returned by Auth::user() even when they both represent the same user. I attempt to solve this problem comparing through getAuthIdentifier() instead of the objects directly.

[thecrypticace]

This would not properly support the (probably small) case in which the user objects being compared are of different types. It could result in false positives if the objects have equa authentication identifiers (which is, by default, the primary key of the model).

Perhaps you should assert that the types are the same too?

[sileence]

I think this should be fine now, what do you think @thecrypticace? And thank you for pointing out that possible scenario.

[thecrypticace]

Yeah, that looks good to me.

[sileence]

@GrahamCampbell or @taylorotwell can you please review and merge this today? (if everything is OK)