UndefinedTransitionException example

// We prefer to return transitions blocker by something else than             // marking. Because it means the marking was OK. Transitions are             // deterministic: it's not possible to have many transitions enabled             // at the same time that match the same marking with the same name             if (!$transitionBlockerList->has(TransitionBlocker::BLOCKED_BY_MARKING)) {
                return $transitionBlockerList;
            }
        }

        if (!$transitionBlockerList) {
            throw new UndefinedTransitionException($subject, $transitionName, $this);
        }

        return $transitionBlockerList;
    }

    public function apply(object $subject, string $transitionName, array $context = []): Marking
    {
        $marking = $this->getMarking($subject, $context);

        $transitionExist = false;
        $approvedTransitions = [];