在rspec中，水豚匹配器总是求值为TRUE。为什么？

Question

我在Ruby 1.9.3，Padrino 0.10.7，rspec 2.11.0，capybara 2.0.2上设置的capybara和rspec发生了一些奇怪的事情。

一个基本的Padrino项目设置了haml和rspec (目前还没有自定义代码！)而不仅仅是加载一个"/“页面(我在下面的规范中通过"puts page.content”验证了它确实可以按预期呈现)。这是一个简单的规范。“假的”不存在，但“主页”does...note，当我放到控制台时，预期的真/假是正确的，但由于某些原因，匹配器没有正确地看到真/假。

到目前为止，我唯一的线索是在第二个规范中使用了应该have_content('Bogus')，它报告说Proc是预期的……

./spec/controller/hello_world_spec.rb

require 'spec_helper'

require 'capybara'
require 'capybara/rspec'

describe 'The HelloWorld App', :type => :feature do

  context "per documentation" do 
    it "has bogus content" do
      visit '/'
      page.has_content?('Bogus')
    end

    it "does not have bogus content" do
      visit '/'
      page.should have_content("Bogus")
    end
  end

  context "should tests" do 
    it "has bogus content" do
      visit '/'
      page.has_content?('Bogus').should == true
    end

    it "does not have bogus content" do
      visit '/'
      page.has_content?('Bogus').should == false
    end
  end

  context "variables" do 
    it "has bogus content" do
      visit '/'
      result = page.has_content?('Bogus')
      puts result
      result.should == true
    end

    it "has Home content (expect TRUE!)" do
      visit '/'
      result = page.has_content?('Home')
      puts result
      result.should == true
    end

    it "does not have bogus content" do
      visit '/'
      result = page.has_content?('Bogus')
      puts result
      result.should == false
    end
  end
end

spec_helper.rb

PADRINO_ENV = 'test' unless defined?(PADRINO_ENV)
require File.expand_path(File.dirname(__FILE__) + "/../config/boot")

def app
  ##
  # You can handle all padrino applications using instead:
  Padrino.application
  # Askme.tap do |app|
  # end
end

RSpec.configure do |conf|
  conf.include Rack::Test::Methods
  Capybara.app = app
end

输出：

11:40:57:website >> bundle exec rspec spec/app/controllers/hello_world_controller_spec.rb 
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.7.8

The HelloWorld App
  per documentation
    has bogus content
    does not have bogus content (FAILED - 1)
  should tests
    has bogus content
    does not have bogus content
  variables
false
    has bogus content
true
    has Home content (expect TRUE!)
false
    does not have bogus content

Failures:

  1) The HelloWorld App per documentation does not have bogus content
     Failure/Error: page.should have_content("Bogus")
     TypeError:
       wrong argument type Capybara::RSpecMatchers::HaveText (expected Proc)
     # ./spec/app/controllers/hello_world_controller_spec.rb:16:in `block (3 levels) in <top (required)>'

Finished in 1.66 seconds
7 examples, 1 failure

Failed examples:

rspec ./spec/app/controllers/hello_world_controller_spec.rb:14 # The HelloWorld App per documentation does not have bogus content

Answer 1

原来罪魁祸首在Gemfile中同时有"bacon“和"rspec”。水豚被介绍到一个项目中，该项目利用bacon作为测试套件，正在尝试的示例是rspec。一旦培根从捆绑的宝石中移除，水豚规格就会按照文档运行。

由于bacon脚本或多或少在rspec下按原样运行，因此项目决策是删除bacon，并为测试套件使用rspec，并对bacon脚本进行较小的调整，以便在rspec下运行所有规范。