tasks: add a task to migrate pjs of procedures in batches

spec/lib/tasks/pieces_justificatives_spec.rb

@@ -0,0 +1,32 @@
+describe 'pieces_justificatives' do
+  describe 'migrate_procedures_range_to_champs' do
+    let(:rake_task) { Rake::Task['pieces_justificatives:migrate_procedures_range_to_champs'] }
+    let(:procedure_in_range_1) { create(:procedure, :with_two_type_de_piece_justificative) }
+    let(:procedure_in_range_2) { create(:procedure, :with_two_type_de_piece_justificative) }
+    let(:procedure_out_of_range) { create(:procedure, :with_two_type_de_piece_justificative) }
+
+    before do
+      procedure_in_range_1
+      procedure_in_range_2
+      procedure_out_of_range
+
+      ENV['RANGE_START'] = procedure_in_range_1.id.to_s
+      ENV['RANGE_END'] = procedure_in_range_2.id.to_s
+
+      allow_any_instance_of(PieceJustificativeToChampPieceJointeMigrationService).to receive(:ensure_correct_storage_configuration!)
+
+      rake_task.invoke
+    end
+
+    after { rake_task.reenable }
+
+    it 'migrates procedures in the ids range' do
+      expect(procedure_in_range_1.reload.types_de_piece_justificative).to be_empty
+      expect(procedure_in_range_2.reload.types_de_piece_justificative).to be_empty
+    end
+
+    it 'doesn’t migrate procedures not in the range' do
+      expect(procedure_out_of_range.reload.types_de_piece_justificative).to be_present
+    end
+  end
+end