Refactor IP registrar restriction

#600

spec/requests/registrar/sessions_spec.rb

@@ -0,0 +1,67 @@
+require 'rails_helper'
+
+RSpec.describe 'Registrar session management', db: false do
+  describe 'GET /registrar/login' do
+    context 'when ip is allowed' do
+      let(:restricted_ip) { instance_double(Authorization::RestrictedIP,
+                                            can_access_registrar_area_sign_in_page?: true) }
+
+      before do
+        allow(Authorization::RestrictedIP).to receive(:new).and_return(restricted_ip)
+      end
+
+      specify do
+        get registrar_login_path
+        expect(response).to be_success
+      end
+    end
+
+    context 'when ip is not allowed' do
+      let(:restricted_ip) { instance_double(Authorization::RestrictedIP,
+                                            can_access_registrar_area_sign_in_page?: false) }
+
+      before do
+        allow(Authorization::RestrictedIP).to receive(:new).and_return(restricted_ip)
+      end
+
+      specify do
+        get registrar_login_path
+        expect(response).to be_forbidden
+      end
+    end
+  end
+
+  describe 'POST /registrar/sessions' do
+    context 'when ip is allowed' do
+      let(:restricted_ip) { instance_double(Authorization::RestrictedIP,
+                                            can_access_registrar_area_sign_in_page?: true) }
+
+      before do
+        allow(Authorization::RestrictedIP).to receive(:new).and_return(restricted_ip)
+      end
+
+      specify do
+        make_request
+        expect(response).to be_success
+      end
+    end
+
+    context 'when ip is not allowed' do
+      let(:restricted_ip) { instance_double(Authorization::RestrictedIP,
+                                            can_access_registrar_area_sign_in_page?: false) }
+
+      before do
+        allow(Authorization::RestrictedIP).to receive(:new).and_return(restricted_ip)
+      end
+
+      specify do
+        make_request
+        expect(response).to be_forbidden
+      end
+    end
+
+    def make_request
+      post registrar_sessions_path, depp_user: { tag: 'test', password: 'test' }
+    end
+  end
+end