how to specify controller and method names in Rspec controller test when using Devise-like route?

Question

tl;dr: unable to rspec-test the devise controllers, help.

I am using Devise and have the following routes (default devise_for routes):

GET    /users/cancel(.:format)      devise/registrations#cancel
POST   /users(.:format)             devise/registrations#create
GET    /users/sign_up(.:format)     devise/registrations#new
GET    /users/edit(.:format)        devise/registrations#edit
PATCH  /users(.:format)             devise/registrations#update
PUT    /users(.:format)             devise/registrations#update
DELETE /users(.:format)             devise/registrations#destroy

I would like to test, using Rspec, that my controller method is spitting out the right output from a given set of parameters.

My spec file looks like this:

describe Users::RegistrationsController, type: 'controller' do
  it 'creates a user with given parameters' do

    post 'create', username: 'jonsnow', password: '012345678912345', authenticity_token: '12345'
    expect(response.status).to eq(200)
  end

end

The error I get is:

Failure/Error: post 'create', username: 'jonsnow', password: '012345678912345', authenticity_token: '12345'
ActionController::UrlGenerationError: 
No route matches {:action=>"create", :controller=>"users/registrations"}

It makes sense since I am using devise_for default routes and as you can see from the rake routes results, the correct route is devise/registrations#create , but I can't seem to find a way to specify the controller name to devise/registrations . I think it's 'inflected' from the controller class name or something to users/registrations . And I would preferably like to avoid messing with my routes in order to make my test successful. How can I accomplish that? (Please explain) Thanks in advance.

My gem versions:

rspec '3.2.1'
ruby '2.1.5'
rails '4.2.0'

Answer 1

There is some additional configuration required to be able to test controllers that inherit from Devise.

describe YourControllerWhichInheritsDevise, type: 'controller' do
  before do
    @request.env["devise.mapping"] = Devise.mappings[:user]
  end

  it 'creates a user with given parameters' do
    post 'create', username: 'jonsnow', password: '012345678912345', authenticity_token: '12345'
    expect(response.status).to eq(200)
  end
end

From the Devise README : "If you are testing Devise internal controllers or a controller that inherits from Devise's, you need to tell Devise which mapping should be used before a request. This is necessary because Devise gets this information from the router, but since functional tests do not pass through the router, it needs to be stated explicitly."