Simplify controller tests requiring admin login

Similar to what we did in commit 3da4ee00b for system tests.

spec/controllers/admin/api/stats_controller_spec.rb

@@ -1,12 +1,9 @@
 require "rails_helper"
 
-describe Admin::Api::StatsController do
+describe Admin::Api::StatsController, :admin do
   describe "GET index" do
-    let(:user) { create(:administrator).user }
-
     context "events or visits not present" do
       it "responds with bad_request" do
-        sign_in user
         get :show
 
         expect(response).not_to be_ok
@@ -29,7 +26,6 @@ describe Admin::Api::StatsController do
       end
 
       it "returns single events formated for working with c3.js" do
-        sign_in user
         get :show, params: { event: "foo" }
 
         expect(response).to be_ok
@@ -48,7 +44,6 @@ describe Admin::Api::StatsController do
         create :visit, started_at: time_1
         create :visit, started_at: time_2
 
-        sign_in user
         get :show, params: { visits: true }
 
         expect(response).to be_ok
@@ -67,7 +62,6 @@ describe Admin::Api::StatsController do
         create(:budget_investment, created_at: time_2)
         create(:budget_investment, created_at: time_2)
 
-        sign_in user
         get :show, params: { budget_investments: true }
 
         expect(response).to be_ok

spec/controllers/admin/budget_investments_controller_spec.rb

@@ -1,10 +1,9 @@
 require "rails_helper"
 
-describe Admin::BudgetInvestmentsController do
+describe Admin::BudgetInvestmentsController, :admin do
   describe "PATCH update" do
     it "does not redirect on AJAX requests" do
       investment = create(:budget_investment)
-      sign_in(create(:administrator).user)
 
       patch :update, params: {
         id: investment,

spec/controllers/admin/hidden_debates_controller_spec.rb

@@ -1,8 +1,6 @@
 require "rails_helper"
 
-describe Admin::HiddenDebatesController do
-  before { sign_in create(:administrator).user }
-
+describe Admin::HiddenDebatesController, :admin do
   describe "PUT confirm_hide" do
     it "keeps query parameters while using protected redirects" do
       debate = create(:debate, :hidden)

spec/controllers/admin/organizations_controller_spec.rb

@@ -1,8 +1,6 @@
 require "rails_helper"
 
-describe Admin::OrganizationsController do
-  before { sign_in create(:administrator).user }
-
+describe Admin::OrganizationsController, :admin do
   describe "PUT verify" do
     it "keeps query parameters while using protected redirects" do
       organization = create(:organization)

spec/spec_helper.rb

@@ -70,10 +70,14 @@ RSpec.configure do |config|
     Bullet.end_request
   end
 
-  config.before(:each, :admin) do
+  config.before(:each, :admin, type: :system) do
     login_as(create(:administrator).user)
   end
 
+  config.before(:each, :admin, type: :controller) do
+    sign_in(create(:administrator).user)
+  end
+
   config.before(:each, :delay_jobs) do
     Delayed::Worker.delay_jobs = true
   end