Laravel namespacing and authentication

I'm working with a Laravel 5.2 test site, and I'm using the built-in auth system to handle logins.

I changed the name of the app namespace to myTest using php artisan app:name myTest

However, when I submit the login form I'm still getting an error due to a namespace issue in the auth system:

FatalErrorException in EloquentUserProvider.php line 126:
Class '\App\User' not found

Is there somewhere I need to edit the namespace so that this will work?

EDIT: PSR4 block of composer.json is:

"psr-4": {
    "myTest\\": "app/"
}

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