MailThief\Testing\InteractsWithMail::seeHeaders PHP Метод

    public function seeHeaders($name, $value = null)
    {
        $this->assertTrue($this->lastMessage()->headers->contains(function ($header) use($name, $value) {
            if (is_null($value)) {
                return $header['name'] === $name;
            }
            return $header['name'] === $name && $header['value'] === $value;
        }));
        return $this;
    }