amelioration(Champs::EngagementJuridiqueChamp): valide le format

app/models/champs/engagement_juridique_champ.rb

@@ -1,2 +1,7 @@
 class Champs::EngagementJuridiqueChamp < Champ
+  # cf: https://communaute.chorus-pro.gouv.fr/documentation/creer-un-engagement/#1522314752186-a34f3662-0644b5d1-16c22add-8ea097de-3a0a
+  validates_with ExpressionReguliereValidator,
+                 expression_reguliere: /([A-Z]|[0-9]|\-|\_|\+|\/)+/,
+                 expression_reguliere_error_message: "Le numéro d'EJ ne peut contenir que des caractères alphanumérique et les caractères spéciaux suivant : “-“ ; “_“ ; “+“ ; “/“",
+                 if: -> { validation_context != :brouillon }
 end

app/validators/expression_reguliere_validator.rb

@@ -2,9 +2,12 @@ class ExpressionReguliereValidator < ActiveModel::Validator
   TIMEOUT = 1.second.freeze
 
   def validate(record)
+    expression_reguliere = options[:expression_reguliere] || record.expression_reguliere
+    expression_reguliere_error_message = options[:expression_reguliere_error_message] || record.expression_reguliere_error_message
+
     if record.value.present?
-      if !record.value.match?(Regexp.new(record.expression_reguliere, timeout: TIMEOUT))
-        record.errors.add(:value, :invalid_regexp, expression_reguliere_error_message: record.expression_reguliere_error_message)
+      if !record.value.match?(Regexp.new(expression_reguliere, timeout: TIMEOUT))
+        record.errors.add(:value, :invalid_regexp, expression_reguliere_error_message: expression_reguliere_error_message)
       end
     end
   rescue Regexp::TimeoutError

spec/models/engagement_juridique_champ_spec.rb

@@ -0,0 +1,41 @@
+describe Champs::EngagementJuridiqueChamp do
+  describe 'validation' do
+    let(:champ) { build(:champ_engagement_juridique, value: value) }
+    subject { champ.valid? }
+
+    context 'with [A-Z]' do
+      let(:value) { "ABC" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with [0-9]' do
+      let(:value) { "ABC" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with -' do
+      let(:value) { "-" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with _' do
+      let(:value) { "_" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with +' do
+      let(:value) { "+" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with /' do
+      let(:value) { "/" }
+      it { is_expected.to be_truthy }
+    end
+
+    context 'with *' do
+      let(:value) { "*" }
+      it { is_expected.to be_falsey }
+    end
+  end
+end