Add a champs/dossier_link endpoint and use it to fetch dossier info

spec/controllers/champs/dossier_link_controller_spec.rb

@@ -0,0 +1,56 @@
+require 'spec_helper'
+
+describe Champs::DossierLinkController, type: :controller do
+  let(:user) { create(:user) }
+  let(:procedure) { create(:procedure, :published) }
+
+  describe '#show' do
+    let(:dossier) { create(:dossier, user: user, procedure: procedure) }
+
+    context 'when user is connected' do
+      render_views
+      before { sign_in user }
+
+      let(:params) do
+        {
+          dossier: {
+            champs_attributes: {
+              '1' => { value: "#{dossier_id}" }
+            }
+          },
+          position: '1'
+        }
+      end
+      let(:dossier_id) { dossier.id }
+
+      context 'when the dossier exist' do
+        before {
+          get :show, params: params, format: 'js'
+        }
+
+        it 'returns the procedure name' do
+          expect(response.body).to include('Dossier en brouillon')
+          expect(response.body).to include(procedure.libelle)
+          expect(response.body).to include(procedure.organisation)
+        end
+      end
+
+      context 'when the dossier does not exist' do
+        let(:dossier_id) { '13' }
+        before {
+          get :show, params: params, format: 'js'
+        }
+
+        it { expect(response.body).to include('Ce dossier est inconnu') }
+      end
+    end
+
+    context 'when user is not connected' do
+      before {
+        get :show, params: { position: '1' }, format: 'js'
+      }
+
+      it { expect(response.code).to eq('401') }
+    end
+  end
+end