为RSpec套件中的所有示例设置变量一次（不使用全局变量） [英] Set variable once for all examples in RSpec suite (without using a global variable)

问题描述

我现在在<$ c $中设置一个全局变量c> spec_helper ，用于检查规范是否在调试模式下运行

  $ debug = ENV.key？（'DEBUG'）&& （ENV ['DEBUG']。casecmp（'false'）！= 0）&& （ENV ['DEBUG']。casecmp（'no'）！= 0）
  

将这些信息提供给套件中的所有示例，而无需使用全局变量，也无需重新计算每个上下文和/或示例的值？ （我的理解是，在（：all）块之前使用会在每个上下文中重新计算一次;但是， before（：suite）不能用于设置实例变量。）

（注意：我要求了解更多关于优秀设计的知识来解决这个问题问题，我知道一个全局并不是什么大问题。）为解决这个问题，我通常编写自定义模块，我可以包括在 spec_helper.rb 文件中。

假设我正在测试后端API，每一次JSON响应正文都不想分析。

  spec / 
 spec / spec_helper.rb 
 spec / support / request_helper.rb 
 spec / controllers / api / v1 / users_controller_spec.rb 
  

<

 ＃request_helper.rb 
模块请求我在第一个模块中定义了一个函数。 
模块JsonHelpers 
 def json_response 
 @json_response || = JSON.parse（response.body，symbolize_names：true）
 end 
 end 
 end 
  

然后，我在一些测试类型中默认包含这个模块

  #spec_helper .rb 
＃... 
 RSpec.configure do | config | 
 config.include Request :: JsonHelpers，输入：：controller 
 end 
  

然后我使用测试中定义的方法。

 ＃users_controller_spec.rb 
 require'rails_helper'
 
 RSpec.describe Api :: V1 :: UsersController，输入：：controller do 
＃... 
 
描述POST #createdo 
 
上下文当成功创建时做
之前（：每个）做
 @user_attributes = FactoryGirl.attributes_for：用户
发布：创建，参数：{user：@user_attributes} 
 end 
 
为刚刚创建的用户记录呈现json表示形式do 
 user_response = json_response [：user] 
 expect（user_response [：email]）。to eq @user_attributes [：email]）
 end 
 
 it {should respond_with 201} 
 end 
 end 
  
  pre 
 $ b 
模块E nvHelper 
 def is_debug_mode？ 
 @debug_mode || = ENV ['DEBUG'] 
结束
结束
  
然后您可以包含它并在测试中简单地使用方法 is_debug_mode？。
 
What is the conventional way to set a variable once to be used by all examples in an RSpec suite?

I currently set a global variable in spec_helper that checks whether the specs are being run in a "debug mode"
$debug = ENV.key?('DEBUG') && (ENV['DEBUG'].casecmp('false') != 0) && (ENV['DEBUG'].casecmp('no') != 0)
How do I make this information available to all the examples in the suite without using a global variable and without re-computing the value for each context and/or example? (My understanding is that using a before(:all) block would re-compute it  once per context; but, that before(:suite) can't be used to set instance variables.)

(Note: I'm asking more to learn about good design that to address this specific problem.  I know one global isn't a big deal.)
解决方案
for this purpose I usually write custom modules that I can include in the spec_helper.rb file.

Let's say that I am testing a back-end API and I don't want to parse every time the JSON response body.
spec/
spec/spec_helper.rb
spec/support/request_helper.rb
spec/controllers/api/v1/users_controller_spec.rb
I first define a function in a module placed under the support subfolder.
# request_helper.rb
module Request
  module JsonHelpers
    def json_response
      @json_response ||= JSON.parse(response.body, symbolize_names: true)
    end
  end
end
Then I include this module by default for some test types
#spec_helper.rb
#...
RSpec.configure do |config|
  config.include Request::JsonHelpers, type: :controller
end
Then I use methods defined in the test.
# users_controller_spec.rb
require 'rails_helper'

RSpec.describe Api::V1::UsersController, type: :controller do
  # ...

 describe "POST #create" do

    context "when is successfully created" do
      before(:each) do
        @user_attributes = FactoryGirl.attributes_for :user
        post :create, params: { user: @user_attributes }
      end

      it "renders the json representation for the user record just created" do
        user_response = json_response[:user]
        expect(user_response[:email]).to eq(@user_attributes[:email])
      end

      it { should respond_with 201 }
    end
end
In your case, you could create a module such as
module EnvHelper
  def is_debug_mode?
    @debug_mode ||= ENV['DEBUG']
  end
end
Then you can include it and simply use the method is_debug_mode? in your tests.

                        
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