Add test for valid app_settings

spec/factories/app_settings.rb

@@ -2,7 +2,7 @@
 
 FactoryBot.define do
   factory :app_setting do
-    singleton_guard { 1 }
+    singleton_guard { 0 }
     vsphere_server_ip { '127.0.0.1' }
     vsphere_server_user { 'user@domain.tld' }
     vsphere_server_password { 'verySecure' }

spec/models/app_setting_spec.rb

@@ -5,13 +5,20 @@
 # We should add some tests here, which test that the validation is correct
 RSpec.describe AppSetting, type: :model do
   describe 'validation tests' do
-    let(:app_setting) { FactoryBot.build :app_setting }
+    let(:app_setting) {FactoryBot.build :app_setting}
 
     context 'when settings are invalid' do
       it 'is invalid with if it is not the first setting' do
         app_setting.singleton_guard = 2
         expect(app_setting).to be_invalid
       end
     end
+
+    context 'when settings are valid' do
+      it 'is valid with valid attributes' do
+        expect(app_setting).to be_valid
+      end
+    end
+
   end
 end