<?php

use App\Listeners\SendWelcomeEmail;
use Illuminate\Support\Facades\Queue;
use Illuminate\Events\CallQueuedListener;

// Test setup and so on...

Queue::fake();

// Perform the thing that fires the events

Queue::assertPushed(CallQueuedListener::class, function ($job) {
    return $job->class === SendWelcomeEmail::class;
});