class Shoulda::Matchers::ActionController::CallbackMatcher

def callbacks
  controller_class._process_action_callbacks.select do |callback|
    callback.kind == kind
  end
end

def description
  "have :#{method_name} as a #{kind}_#{callback_type}"
end

def failure_message
  "Expected that #{controller_class.name} would have :#{method_name} as a #{kind}_#{callback_type}"
end

def failure_message_when_negated
  "Expected that #{controller_class.name} would not have :#{method_name} as a #{kind}_#{callback_type}"
end

def initialize(method_name, kind, callback_type)
  @method_name = method_name
  @kind = kind
  @callback_type = callback_type
end

def matches?(controller)
  @controller = controller
  @controller_class = controller.class
  callbacks.map(&:filter).include?(method_name)
end