fix(instructeur/dossiers#create_avis): as an instructeur, when I ask an avis, i hope to be notified when the expert give his avis

spec/controllers/instructeurs/dossiers_controller_spec.rb

@@ -509,6 +509,13 @@ describe Instructeurs::DossiersController, type: :controller do
       end
     end
 
+    context 'as an instructeur, i auto follow the dossier so I get the notifications' do
+      it 'works' do
+        subject
+        expect(instructeur.follows.where(dossier: dossier).count).to eq(1)
+      end
+    end
+
     context 'email sending' do
       before do
         subject