Ruby on rails 如何对验证器进行RSpec？

我已经创建了一个验证器文件，并在该验证器文件中编写了模型的验证，我想对该验证器的每个属性进行Rspec，我该怎么做

#This is my validator
# my path   app/models/validators/book.rb
class Validators:: Book
  include ActiveModel::Validations
  attr_accessor :title

  # initialize attributes
  def initialize(book = {})
    unless book.class.name == "book"
    raise "Argument is not of Book model object."
  end

  # loop through each user attribute and assign to its relevant attribute of validation class
  book.attributes.each do |name, value|
    # assign an existing attribute to validator class with the value
    if self.respond_to? name
        send("#{name}=", value)
    end
  end
  validates_length_of :title, minimum: 2, maximum: 8
end

Thoughbot的gem提供了一些测试验证的好方法：

RSpec.describe Robot, type: :model do
  it { should validate_presence_of(:arms) }
end

---

我解决了我的问题。 谢谢你的帮助

# And path of this file is spec/models/validators/book_spec.rb
require 'rails_helper'

RSpec.describe Validators::Book do
   it {should validate_length_of(:title).is_at_most(64), allow_value(nil).for(:user_lastname)}
end

---

这是我用过的，但它只适用于模型，不适用于验证器。这是一次很好的尝试，你一定会成功的。