rspec routing with subdomain - subdomain

Question

I'm having a Rails 5 api only app using rspec and versioned this way :
app
- controllers
- api
- v1
- users_controller.rb
My api/v1/users_controller.rb :
module Api::V1
class UsersController < ApiController
My config\routes.rb :
Rails.application.routes.draw do
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
constraints subdomain: 'api' do
scope module: 'api' do
namespace :v1 do
resources :users
end
end
end
end
When I check the routes with rails routes it shows me.
Prefix Verb URI Pattern Controller#Action
v1_users GET /v1/users(.:format) api/v1/users#index {:subdomain=>"api"}
POST /v1/users(.:format) api/v1/users#create {:subdomain=>"api"}
v1_user GET /v1/users/:id(.:format) api/v1/users#show {:subdomain=>"api"}
PATCH /v1/users/:id(.:format) api/v1/users#update {:subdomain=>"api"}
PUT /v1/users/:id(.:format) api/v1/users#update {:subdomain=>"api"}
DELETE /v1/users/:id(.:format) api/v1/users#destroy {:subdomain=>"api"}
My spec file :
require "rails_helper"
RSpec.describe Api::V1::UsersController, type: :routing do
describe "routing" do
it "routes to #index" do
expect(:get => "/v1/users").to route_to("api/v1/users#index")
end
it "routes to #create" do
expect(:post => "/v1/users").to route_to("api/v1/users#create")
end
it "routes to #show" do
expect(:get => "/v1/users/1").to route_to("api/v1/users#show", :id => "1")
end
it "routes to #update via PUT" do
expect(:put => "/v1/users/1").to route_to("api/v1/users#update", :id => "1")
end
it "routes to #update via PATCH" do
expect(:patch => "/v1/users/1").to route_to("api/v1/users#update", :id => "1")
end
it "routes to #destroy" do
expect(:delete => "/v1/users/1").to route_to("api/v1/users#destroy", :id => "1")
end
end
end
But when I'm testing my routes with rspec it fails as it.
bundle exec rspec spec/routing/users_routing_spec.rb
FFFFF
Failures:
1) Api::V1::UsersController routing routes to #index
Failure/Error: expect(:get => "/v1/users").to route_to("api/v1/users#index")
No route matches "/v1/users"
# ./spec/routing/users_routing_spec.rb:7:in `block (3 levels) in <top (required)>'
I don't understand why. Any idea ?

Answer 1

You have to specify "subdomain" for your spec.
before do
Rails.application.routes.default_url_options[:host] = 'test.host'
end
it "routes to #index" do
expect(:get => v1_users_url).to route_to('v1/users#index', subdomain: 'api')
end