raise if trying to del a user who can't be deleted

app/models/user.rb

@@ -101,6 +101,10 @@ class User < ApplicationRecord
   end
 
   def delete_and_keep_track_dossiers(administration)
+    if !can_be_deleted?
+      raise "Cannot delete this user because instruction has started for some dossiers"
+    end
+
     if can_be_deleted?
       dossiers.each do |dossier|
         dossier.delete_and_keep_track(administration)

lib/tasks/support.rake

@@ -15,10 +15,6 @@ namespace :support do
     user = User.find_by!(email: user_email)
     administration = Administration.find_by!(email: administration_email)
 
-    if !user.can_be_deleted?
-      fail "Cannot delete this user because instruction has started for some dossiers"
-    end
-
     user.delete_and_keep_track_dossiers(administration)
     user.destroy
   end

spec/models/user_spec.rb

@@ -232,11 +232,8 @@ describe User, type: :model do
 
     context 'avec un dossier en instruction' do
       let!(:dossier_en_instruction) { create(:dossier, :en_instruction, user: user) }
-      it 'ne supprime rien si dossier en instruction' do
+      it 'raises' do
-        user.delete_and_keep_track_dossiers(administration)
+        expect { user.delete_and_keep_track_dossiers(administration) }.to raise_error
-
-        expect(Dossier.find_by(id: dossier_en_instruction.id)).to be_present
-        expect(User.find_by(id: user.id)).to be_present
       end
     end