在Sinatra模块化应用程序中设置RSpec

这是我第一次尝试辛纳屈。我构建了一个简单的经典应用程序,为其设置了RSpec,并使其正常工作。然后,我尝试以MVC的方式进行模块化。即使该应用程序在浏览器中运行,RSpec仍会抛出 NoMethodError 。我已经阅读了关于RSpec的Sinatra文档,也在SO中搜索了很多,但我找不到bug在哪里。有线索吗?

事先非常感谢。

以下是我的相关文件:

配置.ru

require 'sinatra/base'

Dir.glob('./{app/controllers}/*.rb') { |file| require file }

map('/') { run ApplicationController }

应用.rb

require 'sinatra/base'

class ZerifApp < Sinatra::Base
  # Only start the server if this file has been
  # executed directly
  run! if __FILE__ == $0
end

app/controllers/application_controller.rb

class ApplicationController < Sinatra::Base
  set :views, File.expand_path('../../views', __FILE__)
  set :public_dir, File.expand_path('../../../public', __FILE__)

  get '/' do
    erb :index
  end
end

规范/spec_helper.rb

require 'rack/test'

# Also tried this
# Rack::Builder.parse_file(File.expand_path('../../config.ru', __FILE__))

require File.expand_path '../../app.rb', __FILE__

ENV['RACK_ENV'] = 'test'

module RSpecMixin
  include Rack::Test::Methods
  def app() described_class end
end

RSpec.configure { |c| c.include RSpecMixin }

规范/app_spec.rb

require File.expand_path '../spec_helper.rb', __FILE__

describe "My Sinatra Application" do
  it "should allow accessing the home page" do
    get '/'
    expect(last_response).to be_ok
  end
end

错误

My Sinatra Application should allow accessing the home page
     Failure/Error: get '/'
     NoMethodError:
       undefined method `call' for nil:NilClass
     # ./spec/app_spec.rb:5:in `block (2 levels) in <top (required)>'