Assert a given command is scheduled once on Laravel Task Scheduling

TestCase.php

<?php

namespace Tests;

use Illuminate\Console\Scheduling\Event;
use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
use Illuminate\Support\Str;

abstract class TestCase extends BaseTestCase
{
    use CreatesApplication;

    protected function assertScheduledOnce(string $command, string $cronExpression): void
    {
        $scheduler = $this->app->make(Schedule::class);

        $events = collect($scheduler->events())->filter(
            fn (Event $event) => Str::contains($event->command, $command)
        );

        $this->assertCount(1, $events);

        /** @var Event $event */
        $event = $events->first();
        $this->assertEquals($cronExpression, $event->expression);
    }
}