Routing Error in feature testing with RSpec - ruby-on-rails

Question

I'm working on a Project and trying to write some tests for it. At the Moment i'm doing the feature tests.
The Problem: I just can't use visit. Doesn't matter where i am using it. I receive the error: ActionController::RoutingError: No route matches [GET] "/".
Here is a simple example of the test:
require 'rails_helper'
RSpec.feature "Welcome", type: :feature do
context 'sign in user and load index' do
visit new_user_session_path #didn't worked with "/" nor "/login" either
end
end
May it's a problem with RSpec? I just don't know how to fix it.
I'm really glad if someone would try to help me.
EDIT:
The routes.rb:
Rails.application.routes.draw do
REGEX_NAME = /[^\/]+/
constraints OperatorSubdomain do
get '/', to: 'operators#index'
devise_for :operators, controllers: {
sessions: 'operators/sessions'
}, skip: %i[registrations passwords unlocks omniauth_callbacks confirmations]
authenticate :operator do
require 'sidekiq/web'
mount Sidekiq::Web => '/sidekiq'
Sidekiq::Web.set :sessions, false
ActiveAdmin.routes(self)
end
end
constraints AppSubdomain do
root 'welcome#index'
scope '/', module: 'welcome' do
get '/faq', action: :faq
get '/impressum', action: :imprint
end
get '/partners', to: 'companies#my_partners', as: :partners
delete '/partners', to: 'companies#destroy_partnership'
devise_scope :user do
get '/login' => 'users/sessions#new', as: :new_user_session
post '/login' => 'users/sessions#create', as: :user_session
get '/register' => 'users/registrations#new', as: :new_user_registration
post '/register' => 'users/registrations#create', as: :user_registration
delete '/logout', to: 'users/sessions#destroy', as: :destroy_user_session
post '/users/notification_token', to: 'users/sessions#set_login_time', as: :notification_token
get '/users/invitation', to: 'users#invitation', as: :users_invitation
post '/users/invitation', to: 'users#complete_invitation'
end
scope '/setup', module: :setup do
get '/', action: :index, as: :setup
post '/', action: :create
end
devise_for :users, controllers: {
omniauth_callbacks: 'users/omniauth_callbacks',
confirmations: 'users/confirmations',
registrations: 'users/registrations',
passwords: 'users/passwords'
}, skip: :session
scope '/profiles/:name', module: :users, constraints: { name: REGEX_NAME } do
get '/', action: :show, as: :profile
put '/', action: :update
end
That's the important part of the routes.rb i think.

Answer 1

You should use scenario instead of context:
RSpec.feature "Welcome", type: :feature do
scenario 'sign in user and load index' do
visit new_user_session_path #didn't worked with "/" nor "/login" either
end
end
EDIT:
Looks like you're using subdomains, is it right? If yes, you should take a look https://robots.thoughtbot.com/acceptance-tests-with-subdomains