feat(piece_justificative): allow user to replace a PJ for dossier en_construction

spec/controllers/champs/piece_justificative_controller_spec.rb

@@ -5,6 +5,8 @@ describe Champs::PieceJustificativeController, type: :controller do
   let(:champ) { dossier.champs_public.first }
 
   describe '#update' do
+    let(:replace_attachment_id) { nil }
+
     render_views
     before { sign_in user }
 
@@ -12,8 +14,9 @@ describe Champs::PieceJustificativeController, type: :controller do
       put :update, params: {
         position: '1',
         champ_id: champ.id,
-        blob_signed_id: file
-      }, format: :turbo_stream
+        blob_signed_id: file,
+        replace_attachment_id:
+      }.compact, format: :turbo_stream
     end
 
     context 'when the file is valid' do
@@ -65,6 +68,33 @@ describe Champs::PieceJustificativeController, type: :controller do
         expect(JSON.parse(response.body)).to eq({ 'errors' => ['La pièce justificative n’est pas d’un type accepté'] })
       end
     end
+
+    context 'replace an attachment' do
+      let(:file) { fixture_file_upload('spec/fixtures/files/piece_justificative_0.pdf', 'application/pdf') }
+      before { subject }
+
+      context "attachment associated to dossier" do
+        let(:champ) { create(:champ, :with_piece_justificative_file, dossier:) }
+        let(:replace_attachment_id) { champ.piece_justificative_file.first.id }
+
+        it "replaces an existing attachment" do
+          champ.reload
+
+          expect(champ.piece_justificative_file.attachments.count).to eq(1)
+          expect(champ.piece_justificative_file.attachments.first.filename).to eq("piece_justificative_0.pdf")
+        end
+      end
+
+      context "attachment not associated to dossier" do
+        let(:other_champ) { create(:champ, :with_piece_justificative_file) }
+        let(:replace_attachment_id) { other_champ.piece_justificative_file.first.id }
+
+        it "add attachment, don't replace attachment" do
+          expect(champ.reload.piece_justificative_file.attachments.count).to eq(1)
+          expect(other_champ.reload.piece_justificative_file.attachments.count).to eq(1)
+        end
+      end
+    end
   end
 
   describe '#template' do