12

我正在编写一个调用一些外部服务的 Sinatra 应用程序。我显然希望我的测试避免调用真正的服务所以假设现在我有这个

class MyApp < Sinatra::Base
  get '/my_method' do
    @result = ExternalServiceHandler.new.do_request
    haml :my_view
  end
end

在我的测试中

describe "my app" do
  include Rack::Test::Methods
  def app() MyApp end

  it "should show OK if call to external service returned OK" do
    @external_service_handler = MiniTest::Mock.new
    @external_service_handler.expect :do_request, "OK"

    #Do the injection

    get '/my_method'
    response.html.must_include "OK"
  end

  it "should show KO if call to external service returned KO" do
    @external_service_handler = MiniTest::Mock.new
    @external_service_handler.expect :do_request, "KO"

    #Do the injection

    get '/my_method'
    response.html.must_include "KO"
  end

end

我可以想到两种注入方法。我可以调用实例方法或通过构造函数传递依赖项。无论如何，因为 rack 似乎没有让我访问当前的应用程序实例，所以我发现这是不可能的。

我可以为此声明一个类方法，但如果可能的话，我更喜欢使用实例。为了保持在每种情况下都有可能进行不同的注入，并避免在我忘记回滚状态时可能损害其他测试的全局状态。

有没有办法做到这一点？

提前致谢。

4

2 回答 2

12

似乎有几个选项。您可以通过构造函数传递依赖项，也可以使用设置。

构造函数参数

class MyApp < Sinatra::Base
    def initialize(app = nil, service = ExternalServiceHandler.new)
        super(app)
        @service = service
    end

    get "/my_method" do
        @result = @service.do_request
        haml :my_view
    end
end

在规范中：

describe "my app" do
    include Rack::Test::Methods

    let(:app) { MyApp.new(service) }
    let(:service) { double(ExternalServiceHandler) }

    context "when the external service returns OK" do
        it "shows OK" do
            expect(service).to receive(:do_request).and_return("OK")

            get '/my_method'
            response.html.must_include "OK"
        end
    end

    context "when the external service returns KO" do
        it "shows KO" do
            expect(service).to receive(:do_request).and_return("KO")

            get '/my_method'
            response.html.must_include "KO"
        end
    end
end

设置

class MyApp < Sinatra::Base
    configure do
        set :service, ::ExternalServiceHandler.new
    end

    get "/my_method" do
        @result = settings.service.do_request
        haml :my_view
    end
end

在规范中：

describe "my app" do
    include Rack::Test::Methods

    let(:app) { MyApp.new }
    let(:service) { double(ExternalServiceHandler) }
    before do
        MyApp.set :service, service
    end

    context "when the external service returns OK" do
        it "shows OK" do
            expect(service).to receive(:do_request).and_return("OK")

            get '/my_method'
            response.html.must_include "OK"
        end
    end

    context "when the external service returns KO" do
        it "shows KO" do
            expect(service).to receive(:do_request).and_return("KO")

            get '/my_method'
            response.html.must_include "KO"
        end
    end
end
于 2013-12-22T04:12:51.090 回答
2

我终于设法做到了

describe "my app" do

  def app
    @INSTANCE
  end

  before do
    @INSTANCE ||= MyApp.new!
  end

  #tests here

end

虽然我不是特别喜欢用新的！在它工作的那一刻超载。我可以使用 app.whatever_method 与每个测试一起使用的实例

于 2012-09-10T10:15:59.543 回答