specs: add a test for dossier_vide.pdf.prawn

app/views/dossiers/dossier_vide.pdf.prawn

@@ -199,7 +199,7 @@ prawn_document(page_size: "A4") do |pdf|
   pdf.text "\n"
 
   add_title(pdf, 'Formulaire')
-  add_single_line(pdf, @procedure.description + "\n", 9, :italic) if @procedure.description.present?
+  add_single_line(pdf, @dossier.procedure.description + "\n", 9, :italic) if @dossier.procedure.description.present?
   add_champs(pdf, @dossier.champs)
   add_page_numbering(pdf)
   add_procedure(pdf, @dossier)

spec/views/dossiers/dossier_vide.pdf.prawn_spec.rb

@@ -0,0 +1,16 @@
+describe 'dossiers/dossier_vide.pdf.prawn', type: :view do
+  let(:procedure) { create(:procedure, :with_all_champs) }
+  let(:dossier) { create(:dossier, procedure: procedure) }
+
+  before do
+    assign(:procedure, procedure)
+    assign(:dossier, dossier)
+  end
+
+  subject { render }
+
+  it 'renders a PDF document with empty fields' do
+    subject
+    expect(rendered).to be_present
+  end
+end