The laravel-dummy-observer from bogdanghervan

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Independently observe multiple models

When working with multiple models, it is not possible to assert a save against the model where the save originated.

Let's assume two models, Flight and Passenger. While we can perfectly prevent the models from being saved and assert saved attributes (provided we issue the assertions in the same order as the original saves), we cannot simply just assert that only Passenger was saved.

See full example:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    protected $fillable = [
        'departure',
        'destination',
        'status'
    ];

    public function add(Passenger $passenger)
    {
        $this->status = 'boarding';
        $this->save();

        $passenger->boarded();
    }
}

class Passenger extends Model
{
    protected $fillable = [
        'name',
        'status'
    ];

    public function boarded()
    {
        $this->status = 'boarded';
        $this->save();
    }
}

This would be a likely test:

<?php

namespace Tests\Unit;

use Tests\TestCase;
use App\Models\Flight;
use App\Models\Passenger;
use BogdanGhervan\DummyObserver;

class FlightTest extends TestCase
{
    protected function tearDown(): void
    {
        DummyObserver::clear();
    }

    public function testAdd(): void
    {
        Flight::observe(DummyObserver::class);
        Passenger::observe(DummyObserver::class);

        $flight = new Flight([
            'departure' => 'Bucharest',
            'destination' => 'New York',
        ]);

        $passenger = new Passenger([
            'name' => 'John Smith'
        ]);

        $flight->add($passenger);

        DummyObserver::assertSavedAttributes([
            'departure' => 'Bucharest',
            'destination' => 'New York',
            'status' => 'boarding'
        ]);

        DummyObserver::assertSavedAttributes([
            'name' => 'John Smith',
            'status' => 'boarded'
        ]);
    }
}