RSpec 未定义方法"errors_on"

Question

我有以下模型，我想用RSpec测试:

class Language < ActiveRecord::Base
  has_and_belongs_to_many :dvds
  validates :title, presence: true, uniqueness: { case_sensitive: false }
end

language_spec.rb

describe Language do
  describe 'title validation' do
    context 'title is present' do
      before(:each) do
        @lang = Language.new(title: 'English')
      end
      it 'is valid with present title' do
        expect(@lang).to have_exactly(0).errors_on(:title)
      end
    end
    context 'title is not present' do
      before(:each) do
        @lang = Language.create
      end
      it 'has an error on title attribute' do
        expect(@lang).to have_exactly(1).errors_on(:title)
      end
    end
  end
end

不幸的是，我得到测试失败:

失败:

1)语言标题验证title is present是有效的标题失败/错误:期望(@lang)。have_exactly (0) .errors_on(标题)NoMethodError:

中的未定义方法errors_on' for #<Language:0xaa40e98> # ./spec/models/language_spec.rb:9:in块(4级)

2)语言标题验证标题不存在有一个错误标题属性失败/错误:期望(@lang)。have_exactly (1) .errors_on(标题)NoMethodError:

中的未定义方法errors_on' for #<Language id: nil, title: nil, created_at: nil, updated_at: nil> # ./spec/models/language_spec.rb:19:in块(4级)

Gemfile

source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.1'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer',  platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0',          group: :doc
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring',        group: :development
# Pagination plugin
gem 'will_paginate', '~> 3.0'
# Testing
group :development, :test do
  gem "rspec-rails", "~> 3.0.1"
  gem "factory_girl_rails", "~> 4.4.1"
end
group :test do
  gem "faker", "~> 1.3.0"
  gem "capybara", "~> 2.3.0"
  gem "database_cleaner", "~> 1.3.0"
  gem "launchy", "~> 2.4.2"
  gem "selenium-webdriver", "~> 2.42.0"
end

知道为什么我得到undefined method "errors_on"吗?

Answer 1

errors_on匹配器移动到spec_collection_matchers gem中，因此将其添加到Gemfile中可以修复错误。

如果您想摆脱非核心语法，您可以使用

describe Language do
  describe 'title validation' do
    context 'title is present' do
      before(:each) do
        @lang = Language.new(title: 'English')
      end
      it 'is valid with present title' do
        expect(@lang.errors[:title]).to be_empty
      end
    end
    context 'title is not present' do
      before(:each) do
        @lang = Language.create
      end
      it 'has an error on title attribute' do
        expect(@lang.errors.added?(:title, :blank)).to be_true
      end
    end
  end
end

(have_exactly和相关的匹配器也移到了respect -collection_matchers.)

Answer 2

尝试设置类型选项:

describe Language, type: :model do

或者使用infer_spec_type_from_file_location!(参见这里)

RSpec.configure do |config|
  config.infer_spec_type_from_file_location!
end