Fix multiple_drop_down_list mandatory check

app/models/champ.rb

@@ -94,6 +94,8 @@ class Champ < ApplicationRecord
     case type_de_champ.type_champ
     when TypeDeChamp.type_champs.fetch(:carte)
       geo_areas.blank? || value == '[]'
+    when TypeDeChamp.type_champs.fetch(:multiple_drop_down_list)
+      value.blank? || value == '[]'
     else
       value.blank?
     end

spec/models/champ_shared_example.rb

@@ -15,6 +15,12 @@ shared_examples 'champ_spec' do
       it { expect(champ.mandatory_and_blank?).to be(true) }
     end
 
+    context 'when multiple_drop_down_list mandatory and blank' do
+      let(:type_de_champ) { build(:type_de_champ_multiple_drop_down_list, mandatory: mandatory) }
+      let(:value) { '[]' }
+      it { expect(champ.mandatory_and_blank?).to be(true) }
+    end
+
     context 'when not blank' do
       let(:value) { 'yop' }
       it { expect(champ.mandatory_and_blank?).to be(false) }