[5.5] Allow MailFake to assert mailables were queued

[mateusjatenee]

Hey everyone,

Right now when you queue a mailable you have to either assert it was sent (it was not, as it was queued) or you have to assert Illuminate\Mail\SendQueuedMailable was pushed on to the queue.

This PR gives queued mailables their own property and allows assertions to be made, such as assertWasQueued($mailable).

Let me know what you guys think!

[thecrypticace]

Just my two cents but I'd make this a separate method. It would only be duplicating three lines and a method called queuedMailablesOf makes the intent much clearer.

[mateusjatenee]

I agree, thank you!

Added a commit that changes thi

[mateusjatenee]

Not entirely related, but perhaps we could build the view so the user knows that there are syntax errors or any other kind of error. I opened an issue in laravel/internals laravel/ideas#720

[taylorotwell]

So would this be a breaking change? assertSent would no longer work for them?

[taylorotwell]

@mateusjatenee building the view is a separate test IMO. and one that can already be written pretty easily.

[taylorotwell]

This also doesn't work correctly if a Mailable is implementing ShouldQueue and is sent using Mail::send()

[mateusjatenee]

@taylorotwell Sorry I forgot to queue it if It implemented ShouldQueue — I did this late and forgot it.

I added some code that verifies if the mailable implements the interface and queues if it does. Given #20485 was approved I also added the option to specify how many times it should have been queued.

It would be a BC, yes.. but I believe it's worth it as the "migration" is very simple and verifying a mailable was queued with sent doesn't really make sense I guess.

[taylorotwell]

Thanks