address the issue of second user becoming an admin automatically.

spec/controllers/admin/conferences_controller_spec.rb

@@ -4,7 +4,8 @@ describe Admin::ConferenceController do
 
   # It is necessary to use bang version of let to build roles before user
   let(:conference) { create(:conference) }
-  let!(:first_user) { create(:user) }
+  let!(:deleted_user) { create(:deleted_user) }
+  let!(:admin_user) { create(:user) } # Second user. Automatically becomes admin.
   let!(:organizer_role) { create(:role, name: 'organizer', resource: conference) }
 
   let(:organizer) { create(:user, role_ids: organizer_role.id) }

spec/factories/users.rb

@@ -22,5 +22,11 @@ FactoryGirl.define do
     factory :organizer do
       after(:create) { |user| user.role_ids = create(:organizer_role).id }
     end
+
+    factory :deleted_user do
+      after(:create) { |user| user.email = 'deleted@localhost.osem',
+                       name = 'User deleted',
+                       biography = 'Data is no longer available for deleted user.' }
+    end
   end
 end

spec/models/ability_spec.rb

@@ -4,7 +4,8 @@ require 'cancan/matchers'
 describe 'User' do
   describe 'Abilities' do
     subject(:ability){ Ability.new(user) }
-    let!(:first_user) { create(:user) } # automatically becomes admin
+    let!(:deleted_user) { create(:deleted_user) }
+    let!(:admin_user) { create(:user) } # Second user. Automatically becomes admin.
     let(:user){ nil }
     let(:conference_not_public) { create(:conference, make_conference_public: false) }
     let(:conference_public) { create(:conference, make_conference_public: true)}

spec/models/user_spec.rb

@@ -3,8 +3,8 @@ require 'spec_helper'
 describe User do
 
   # It is necessary to use bang version of let to build roles before user
-  let!(:user_admin) { create(:user) }
-  let!(:admin) { create(:admin) }
+  let!(:deleted_user) { create(:deleted_user) }
+  let!(:admin_user) { create(:user) } # Second user. Automatically becomes admin.
   let!(:participant) { create(:user) }
   let!(:conference) { create(:conference) }
   let!(:organizer_role) { create(:organizer_role, resource: conference) }
@@ -13,7 +13,7 @@ describe User do
   let!(:user) { create(:user) }
 
   it 'returns the correct role' do
-    expect(user_admin.is_admin).to eq(true)
+    expect(admin_user.is_admin).to eq(true)
     expect(organizer.roles.first).to eq(organizer_role)
   end