PHPSpec\Matcher\ThrowMatcher::getException PHP Method

    private function getException(array $arguments)
    {
        if (0 === count($arguments)) {
            return null;
        }
        if (is_string($arguments[0])) {
            return $arguments[0];
        }
        if (is_object($arguments[0])) {
            if ($arguments[0] instanceof \Throwable) {
                return $arguments[0];
            } elseif ($arguments[0] instanceof \Exception) {
                return $arguments[0];
            }
        }
        throw new MatcherException(sprintf("Wrong argument provided in throw matcher.\n" . "Fully qualified classname or exception instance expected,\n" . "Got %s.", $this->presenter->presentValue($arguments[0])));
    }