Spec response for forgery (#3248)

Remove protect_from_forgery in ApiController, which is disabled by the
following skip_before_action, as well.

app/controllers/api_controller.rb

@@ -4,8 +4,6 @@ class ApiController < ApplicationController
   DEFAULT_STATUSES_LIMIT = 20
   DEFAULT_ACCOUNTS_LIMIT = 40
 
-  protect_from_forgery with: :null_session
-
   skip_before_action :verify_authenticity_token
   skip_before_action :store_current_location
 

spec/controllers/api_controller_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe ApiController, type: :controller do
+  controller do
+    def success
+      head 200
+    end
+  end
+
+  it 'does not protect from forgery' do
+    ActionController::Base.allow_forgery_protection = true
+    routes.draw { post 'success' => 'api#success' }
+    post 'success'
+    expect(response).to have_http_status(:success)
+  end
+end

spec/controllers/application_controller_spec.rb

@@ -37,6 +37,16 @@ describe ApplicationController, type: :controller do
     end
   end
 
+  context 'forgery' do
+    subject do
+      ActionController::Base.allow_forgery_protection = true
+      routes.draw { post 'success' => 'anonymous#success' }
+      post 'success'
+    end
+
+    include_examples 'respond_with_error', 422
+  end
+
   it "does not force ssl if LOCAL_HTTPS is not 'true'" do
     routes.draw { get 'success' => 'anonymous#success' }
     ClimateControl.modify LOCAL_HTTPS: '' do