test that invited users are added to the registered group

spec/controllers/hyku/invitations_controller_spec.rb

@@ -31,5 +31,31 @@
       expect(response).to redirect_to Hyrax::Engine.routes.url_helpers.admin_users_path(locale: 'en')
       expect(flash[:notice]).to eq 'An invitation email has been sent to [email protected].'
     end
+
+    context 'when user already exists' do
+      let(:user) { create(:user) }
+
+      # Mimic the state of a user who is only active in other tenants;
+      # i.e. a user who has no roles in this tenant
+      before do
+        user.roles.destroy_all
+      end
+
+      it 'adds the user to the registered group' do
+        expect(user.roles).to be_empty
+        expect(user.groups).to be_empty
+
+        post :create, params: {
+          user: {
+            email: user.email,
+            role: ''
+          }
+        }
+
+        user.reload
+        expect(user.roles).not_to be_empty
+        expect(user.groups).to eq([Ability.registered_group_name])
+      end
+    end
   end
 end