module PrependDependenciesCheckable
  def check_prepend_dependencies(target, dependencies)
    order = Array(dependencies[:before]) + [target] + Array(dependencies[:after])
    self.class.ancestors.reverse.each { |cls| order.shift if cls == order.first }
    order.empty?
  end

  def check_prepend_dependencies!(target, dependencies)
    unless check_prepend_dependencies(target, dependencies)
      raise "Invalid prepend dependencies. target:#{target} ancestors:#{self.class.ancestors} dependencies:#{dependencies}"
    end
  end
end

class Object
  include PrependDependenciesCheckable
end