```ruby
class Inquest::Reactor
  def react!(user, notifiable, action)
  end
end```

Define methods at class level, not instance level
user
```ruby
class Inquest::Reactor
  def self.react!(user, notifiable, action)
    raise NotYetImplementedError
  end

  def self.reaction_description
    raise NotYetImplementedError
  end
end```
assistant