ruby-on-rails - 使用 RSpec 和 Rails 在模型中测试验证

Question

我是使用 RSpec 测试我的应用程序的 super 新手，我正在尝试在没有用户的情况下测试评论的验证并不断收到语法错误。
这是评论模型代码。

class Comment < ApplicationRecord
  belongs_to :user
  belongs_to :product

  scope :rating_desc, -> { order(rating: :desc) }

  validates :body, presence: true
  validates :user, presence: true
  validates :product, presence: true
  validates :rating, numericality: { only_integer: true }

  after_create_commit { CommentUpdateJob.perform_later(self, user) }
end

这是评论规范:

require 'rails_helper'

describe Comment do 
  before do 
    @product = Product.create!(name: "race bike", description: "fast race bike")
        @user = User.create!(email: "jerryhoglen@me.com", password: "Maggie1!")
        @product.comments.create!(rating: 1, user: @user, body: "Awful bike!")
  end

  it "is invalid without a user"
   expect(build(:comment, user:nil)).to_not be_valid
  end
end

Answer 1

你错过了 do ，这样做:

it "is invalid without a user" do
  expect(build(:comment, user: nil)).to_not be_valid
end

但是当它失败时，这不是一个非常明确的测试，我建议您检查实际预期的验证错误。
这可能是这样的:

expect(ValidatingWidget.new.errors_on(:name)).to include("can't be blank")
expect(ValidatingWidget.new(:name => "liquid nitrogen")).to have(0).errors_on(:name)

见 rspec-rails errors_on @ relishapp