Capybara/RSpec'have_css'匹配器不工作但has_css没有

Question

在使用Ruby 2的Rails 3.2.14应用程序中,使用rspec-rails 2.14.0和capybara 2.1.0,以下功能规范导致失败:

require 'spec_helper'

feature 'View the homepage' do
  scenario 'user sees relevant page title' do
    visit root_path
    expect(page).to have_css('title', text: "Todo")
  end
end

失败消息是:

 1) View the homepage user sees relevant page title
 Failure/Error: expect(page).to have_css('title', text: "Todo")
 Capybara::ExpectationNotMet:
   expected to find css "title" with text "Todo" but there were no matches. Also
   found "", which matched the selector but not all filters.

标题元素和正确的文本是在呈现的页面上

但是当我在功能规范中更改此行时:

expect(page).to have_css('title', text: "Todo")

对此:

page.has_css?('title', text: "Todo")

然后测试通过.[编辑 - 但请看@JustinKo下面的回复,这个测试不是一个好的测试,因为它总是会通过]

如何让have_css(...)表单生效？这是配置问题吗？

这是我的相关部分Gemfile:

group :development, :test do
  gem 'rspec-rails' 
  gem 'capybara'
end

我spec/spec_helper.rb的设置如下:

ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
require 'rspec/autorun'
require 'capybara/rails'
require 'capybara/rspec'

Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }

RSpec.configure do |config|

  # out of the box rspec config code ommitted

  config.include Capybara::DSL
end

谁知道我可能做错了什么？

Answer 1

默认情况下,Capybara只查找"可见"元素.头元素(及其标题元素)实际上并不可见.这导致在have_css中忽略title元素.

您可以强制Capybara通过:visible => false选项考虑不可见元素.

expect(page).to have_css('title', :text => 'Todo', :visible => false)

但是,使用该have_title方法会更容易:

expect(page).to have_title('Todo')