correctif(usager.fusion): leve une erreur quand on essaie de fusionner un compte sur lui même

app/models/user.rb

@@ -214,6 +214,7 @@ class User < ApplicationRecord
   end
 
   def merge(old_user)
+    raise "Merging same user, no way" if old_user.id == self.id
     transaction do
       old_user.dossiers.update_all(user_id: id)
       old_user.invites.update_all(user_id: id)

spec/models/user_spec.rb

@@ -423,7 +423,11 @@ describe User, type: :model do
     let(:targeted_user) { create(:user) }
 
     subject { targeted_user.merge(old_user) }
-
+    context 'merge myself' do
+      it 'fails' do
+        expect { old_user.merge(old_user) }.to raise_error 'Merging same user, no way'
+      end
+    end
     context 'and the old account has some stuff' do
       let!(:dossier) { create(:dossier, user: old_user) }
       let!(:hidden_dossier) { create(:dossier, user: old_user, hidden_by_user_at: 1.hour.ago) }