Question

我正在撰写请求规范，以测试 will_paginate 是否正常工作，我遇到了一些问题。首先，这是我的规范的修剪版本：

require 'spec_helper'

describe "Articles" do

  subject { page }

  describe "index page" do

    let(:user) { FactoryGirl.create(:user) }

    before { visit news_path }

    describe "pagination" do

      before(:all) { 31.times { FactoryGirl.create(:article, user: user) } }
      after(:all) { Article.delete_all; User.delete_all }

      let(:first_page)  { Article.paginate(page: 1) }
      let(:second_page) { Article.paginate(page: 2) }

      it "should not list the second page of articles" do
        second_page.each do |article|
          page.should_not have_selector('li', text: article.title)
        end
      end
    end
  end
end

正如您所看到的，有一项测试可确保用户访问文章索引页时不会显示第二页文章。此测试失败：

1) Articles index page pagination should not list the second page of articles
   Failure/Error: page.should_not have_selector('li', text: article.title)
   expected css "li" with text "Article number 1" not to return anything

我无法理解为什么会失败。当我在开发环境中手动创建31篇文章并在浏览器中查看它时，分页工作正常，但是当我切换到测试环境时，规范会失败。

文章模型：

class Article < ActiveRecord::Base
  attr_accessible :body, :title
  belongs_to :user

  validates :user_id, presence: true

  default_scope order: 'created_at DESC'
end

文章工厂看起来像这样：

FactoryGirl.define do
  factory :article do
    sequence(:title)  { |n| "Article number #{n}" }
    body "This is the body"
    user
  end
end

Answer 1

非常令人难以置信的是，解决方法是执行以下操作;

更改：

before(:all) { 31.times { FactoryGirl.create(:article, user: user) } }

为：

before do
  31.times { FactoryGirl.create(:article, user: user) }
  visit news_path
end

我在这里学到的两件事：

before块不得定位(:all)，否则测试失败
我需要在前一个块中明确运行visit news_path，在创建工厂之后，否则capybara的页面对象将不是我期望的那样

所以，举例说明：

这不起作用：

# fails because it targets (:all)
before(:all) do
  31.times { FactoryGirl.create(:article, user: user) }
  visit news_path
end

这也不会：

# fails because we are visiting the news path before the objects exist
before do
  visit news_path
  31.times { FactoryGirl.create(:article, user: user) }
end

需要这样：

# not targeting (:all) and only visiting news path after creation of the objects
before do
  31.times { FactoryGirl.create(:article, user: user) }
  visit news_path
end

超过20个小时来解决这个问题，至少我学到了一些新东西等。

Rspec在测试分页时给出假阴性

1 个答案: