RunTimeError：ActionController :: RackDelegation在rspec 2.10.1中用于rails 3.1.4应用程序控制器
问题描述：
在我们的rails 3.1.4 app中， rspec 用于测试应用程序控制器中的公共方法 require_signin 。以下是方法require_signin：
In our rails 3.1.4 app, rspec is used to test the public method require_signin in application controller. Here is the method require_signin:
def require_signin
if !signed_in?
flash.now.alert = "Log in first!"
redirect_to signin_path
end
end
这是 rspec 代码：
it "should invoke require_signin for those without login" do
controller.send(:require_signin)
controller {should redirect_to signin_path}
end
以上 rspec 会产生巨大的多页错误，如下所示：
The above rspec generates gigantic multi pages error starting like the below:
RuntimeError:←[0m
←[31mActionController::RackDelegation#status= delegated to @_response.status=, but @_response is nil: #<ApplicationController:0x3
a67f10 @_routes=nil, @_action_has_layout=true, @_view_context_class=nil, @_headers={"Content-Type"=>"text/html"}, @_status=200, @_reques
t=#<ActionController::TestRequest:0x3a68720 @env={"rack.version"=>[1, 1], "rack.input"=>#<StringIO:0x34fad60>, ........
rspec可能出现什么问题代码？非常感谢。
答
我遇到了这个错误并意识到我通过调用辅助方法触发控制器上的重定向想要测试，但我还没有真正实例化测试请求。在调用期望之前调用 get：index 消除了错误。
I came across this errror and realized I was triggering a redirect on the controller by calling a helper method I wanted to test, but I hadn't actually instantiated a test request yet. Calling get :index before calling the expectation got rid of the error.
it "redirects if some condition" do
subject.send(:helper_method)
get :action # <= Need this before setting expectation below
response.should redirect_to("/somewhere")
end