Expose is_auditor if auditor user available

ee/lib/ee/api/entities/user_with_admin.rb

@@ -8,7 +8,7 @@ module EE
 
         prepended do
           expose :using_license_seat?, as: :using_license_seat
-          expose :auditor, as: :is_auditor
+          expose :auditor, as: :is_auditor, if: ->(_instance, _opts) { ::License.feature_available?(:auditor_user) }
         end
       end
     end

ee/spec/lib/ee/api/entities/user_with_admin_spec.rb

@@ -25,15 +25,27 @@ RSpec.describe ::EE::API::Entities::UserWithAdmin do
   end
 
   context 'is_auditor' do
-    it 'returns false when user is not an auditor' do
-      expect(subject[:is_auditor]).to be false
+    context 'when auditor_user is available' do
+      it 'returns false when user is not an auditor' do
+        expect(subject[:is_auditor]).to be false
+      end
+
+      context 'when user is an auditor' do
+        let(:user) { create(:user, :auditor) }
+
+        it 'returns true' do
+          expect(subject[:is_auditor]).to be true
+        end
+      end
     end
 
-    context 'when user is an auditor' do
-      let(:user) { create(:user, :auditor) }
+    context 'when auditor_user is not available' do
+      before do
+        stub_licensed_features(auditor_user: false)
+      end
 
-      it 'returns true' do
-        expect(subject[:is_auditor]).to be true
+      it 'does not have the is_auditor param' do
+        expect(subject[:is_auditor]).to be nil
       end
     end
   end