vendor/illuminate/support/Testing/Fakes/EventFake.php

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<?php

namespace Illuminate\Support\Testing\Fakes;

use Closure;
use Illuminate\Support\Arr;
use PHPUnit\Framework\Assert as PHPUnit;
use Illuminate\Contracts\Events\Dispatcher;

class EventFake implements Dispatcher
{
    /**
     * The original event dispatcher.
     *
     * @var \Illuminate\Contracts\Events\Dispatcher
     */
    protected $dispatcher;

    /**
     * The event types that should be intercepted instead of dispatched.
     *
     * @var array
     */
    protected $eventsToFake;

    /**
     * All of the events that have been intercepted keyed by type.
     *
     * @var array
     */
    protected $events = [];

    /**
     * Create a new event fake instance.
     *
     * @param  \Illuminate\Contracts\Events\Dispatcher  $dispatcher
     * @param  array|string  $eventsToFake
     * @return void
     */
    public function __construct(Dispatcher $dispatcher, $eventsToFake = [])
    {
        $this->dispatcher = $dispatcher;

        $this->eventsToFake = Arr::wrap($eventsToFake);
    }

    /**
     * Assert if an event was dispatched based on a truth-test callback.
     *
     * @param  string  $event
     * @param  callable|int|null  $callback
     * @return void
     */
    public function assertDispatched($event, $callback = null)
    {
        if (is_int($callback)) {
            return $this->assertDispatchedTimes($event, $callback);
        }

        PHPUnit::assertTrue(