add login_with_france_connect boolean at the FC connection

spec/controllers/france_connect_controller_spec.rb

@@ -20,9 +20,18 @@ describe FranceConnectController, type: :controller do
       let(:code) { 'plop' }
 
       context 'when code is correct' do
+        let(:email) { 'patator@cake.com' }
+        let(:current_user) { User.find_by_email(email) }
+
         before do
-          allow(FranceConnectService).to receive(:retrieve_user_informations).and_return(Hashie::Mash.new(email: 'patator@cake.com'))
+          allow(FranceConnectService).to receive(:retrieve_user_informations).and_return(Hashie::Mash.new(email: email))
+          get :callback, code: code
         end
+
+        it 'login_with_france_connect user attribut is true' do
+          expect(current_user.login_with_france_connect).to be_truthy
+        end
+
         it 'redirect to dossiers list' do
           get :callback, code: code
           expect(response).to redirect_to(controller: 'users/dossiers', action: :index)