Under the hood: How fake uploaded files work in Laravel

public static function fake()
{
    return new Testing\FileFactory;
}

public function create($name, $kilobytes = 0)
{
    return tap(new File($name, tmpfile()), function ($file) use ($kilobytes) {
        $file->sizeToReport = $kilobytes * 1024;
    });
}

$response = $this->json('POST', '/avatar', [
            'avatar' => $file,
        ]);

protected function generateImage($width, $height, $type)
{
    return tap(tmpfile(), function ($temp) use ($width, $height, $type) {
        ob_start();
 
        $image = imagecreatetruecolor($width, $height);
 
        switch ($type) {
            case 'jpeg':
                imagejpeg($image);
                break;
            case 'png':
                imagepng($image);
                break;
        }
 
        fwrite($temp, ob_get_clean());
    });
}