diff --git a/src/frontend/flask_app/tests/test_maker.py b/src/frontend/flask_app/tests/test_maker.py
index 65ea59a..80e78a0 100644
--- a/src/frontend/flask_app/tests/test_maker.py
+++ b/src/frontend/flask_app/tests/test_maker.py
@@ -313,6 +313,10 @@ class TestImageCropInclusion:
         html = logged_in_client.get("/maker/recipes/3/tasks").get_data(as_text=True)
         assert "js/image-crop.js" in html
         assert "tmfCropBeforeUpload(file)" in html
+        # #107: conversione BMP->PNG e errore upload nel riquadro Disegno Tecnico
+        assert "js/image_to_png.js" in html
+        assert "tmfImageToPng(file)" in html
+        assert "uploadErrorTask" in html
 
     def test_recipe_editor_includes_crop(self, logged_in_client, mock_api_client):
         mock_api_client.get.side_effect = [
@@ -322,3 +326,6 @@ class TestImageCropInclusion:
         html = logged_in_client.get("/maker/recipes/1/edit").get_data(as_text=True)
         assert "js/image-crop.js" in html
         assert "tmfCropBeforeUpload(file)" in html
+        # #107: conversione BMP->PNG prima dei controlli di formato
+        assert "js/image_to_png.js" in html
+        assert "tmfImageToPng(file)" in html