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

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<?php

namespace Illuminate\Support\Testing\Fakes;

use Illuminate\Contracts\Mail\Mailer;
use Illuminate\Contracts\Mail\Mailable;
use Illuminate\Contracts\Mail\MailQueue;
use PHPUnit\Framework\Assert as PHPUnit;
use Illuminate\Contracts\Queue\ShouldQueue;

class MailFake implements Mailer, MailQueue
{
    /**
     * All of the mailables that have been sent.
     *
     * @var array
     */
    protected $mailables = [];

    /**
     * All of the mailables that have been queued.
     *
     * @var array
     */
    protected $queuedMailables = [];

    /**
     * Assert if a mailable was sent based on a truth-test callback.
     *
     * @param  string  $mailable
     * @param  callable|int|null  $callback
     * @return void
     */
    public function assertSent($mailable, $callback = null)
    {
        if (is_numeric($callback)) {
            return $this->assertSentTimes($mailable, $callback);
        }

        $message = "The expected [{$mailable}] mailable was not sent.";

        if (count($this->queuedMailables) > 0) {
            $message .= ' Did you mean to use assertQueued() instead?';
        }

        PHPUnit::assertTrue(
            $this->sent($mailable, $callback)->count() > 0,
            $message
        );
    }

    /**
     * Assert if a mailable was sent a number of times.
     *
     * @param  string  $mailable
     * @param  int  $times
     * @return void
     */
    protected function assertSentTimes($mailable, $times = 1)
    {