ruby-on-rails-4 - Rails 4 Rspec expect{}.to change not registering 尽管测试按计划工作

Question

我正在使用 Rails 4、RSpec、Capybara 和 selenium。我遇到了一个奇怪的问题，在过去一天左右的时间里，我似乎无法解决这个问题。我有一个相当基本的请求规范失败，因为测试没有注册对模型的更改。这是我的规范:

describe "manage pages", :js => true do
    before :each do
        @fake_page = FactoryGirl.create(:page_with_block, name: "Foobar")
        @fake_page2 = FactoryGirl.create(:page_with_block, name: "sdfdf")
        visit admin_pages_path
        save_page
    end

    it "should delete an image when link is clicked" do
        expect {
            within "#page_#{@fake_page.id}" do
                click_link 'Destroy'
            end
            wait = Selenium::WebDriver::Wait.new ignore: Selenium::WebDriver::Error::NoAlertPresentError
            alert = wait.until { page.driver.browser.switch_to.alert }
            alert.accept
        }.to change(Page, :count).by(-1)
        expect(page).to have_content "Listing Pages"
        expect(page).not_to have_content "Foobar"   
        save_page           
    end
end 

如您所见，这是对销毁和确认 js 警报测试的基本点击。问题是它总是失败:

......F

Failures:

  1) Pages manage pages should delete an image when link is clicked
     Failure/Error: expect {
       expected #count to have changed by -1, but was changed by 0
     # ./spec/requests/admin/pages_spec.rb:116:in `block (3 levels) in <top (required)>'

Finished in 11.74 seconds (files took 3.81 seconds to load)
7 examples, 1 failure

根据我之前放置的 save_page 文件，以及当我注释掉“expect.to change”时测试结束时的文件，一切都按预期工作，假页面是在之前，测试通过并单击销毁并接受警报，页面被销毁并重新加载索引页面而没有内容。我不明白的是为什么 Change 匹配器看不到它实际上在工作。

我读到它可能与我的 rails_helper.rb 文件有关，但我查找的所有内容都有类似的设置，即使不完全相同:

    ActiveRecord::Migration.maintain_test_schema!

RSpec.configure do |config|
  config.fixture_path = "#{::Rails.root}/spec/fixtures"

  config.use_transactional_fixtures = false

  config.infer_spec_type_from_file_location!

  config.include Capybara::DSL

    config.before(:suite) do
        DatabaseCleaner.strategy = :truncation
        DatabaseCleaner.clean_with(:truncation)
    end
    config.before(:each) do
        DatabaseCleaner.strategy = :transaction
    end
    config.before(:each, :js => true) do
        DatabaseCleaner.strategy = :truncation
    end
    config.before(:each) do
        DatabaseCleaner.start
    end 
    config.after(:each) do
        DatabaseCleaner.clean
    end 

    config.after(:suite) do
        FileUtils.rm_rf(Dir["#{Rails.root}/public/test/system/"])
    end


end

由于我在谷歌或本网站上找不到其他类似情况，我一定是这里做错了什么。谁能指出我代码中的缺陷？提前致谢。

Answer 1

我一直在为同样的问题而苦苦挣扎。你等待逻辑可能有缺陷。我用了this approach对我来说效果很好。

从这篇文章中复制粘贴 - 基本上你需要创建一个助手:

# spec/support/wait_for_ajax.rb
module WaitForAjax
  def wait_for_ajax
    Timeout.timeout(Capybara.default_max_wait_time) do
      loop until finished_all_ajax_requests?
    end
  end

  def finished_all_ajax_requests?
    page.evaluate_script('jQuery.active').zero?
  end
end

RSpec.configure do |config|
  config.include WaitForAjax, type: :feature
end

在您的 spec_helper.rb 中自动包含所有支持文件

spec/support/**/*.rb in our spec_helper.rb

或者像我一样手动操作:

#rails_helper.rb
require_relative 'support/wait_for_ajax'

现在我的测试通过了!

require 'rails_helper'

RSpec.feature "Call Me Back contact front feature spec >", :type => :feature, js: true do
feature 'valid form' do
  scenario "with name and phone" do
    visit '/'
    execute_script '$("#call-popup").fadeIn(300)'

    fill_in 'call_me_back_request_name', with: 'Clark Kent'
    fill_in 'call_me_back_request_phone', with: '1234445566'

    within '#new_call_me_back_request' do
      expect{
        find("input[type='submit']").click
        wait_for_ajax #<- the magic is here!
      }.to change(Request, :count).by(1)
    end
  end
end