[widgets][assetwidget] Move load confirmation in own method

This allows to write tests more easily.

beat/editor/widgets/assetwidget.py

@@ -394,6 +394,21 @@ class AssetWidget(QWidget):
             asset = Asset.from_path(self.prefix_root_path, file_path)
             asset.delete()
 
+    def confirm_loading(self, errors):
+        """Request loading confirmation"""
+
+        message_box = QMessageBox(
+            QMessageBox.Critical,
+            self.tr("Invalid asset"),
+            self.tr(f"The asset you are trying to load is invalid."),
+        )
+        message_box.setDetailedText(f"{errors}")
+        message_box.addButton(QMessageBox.Cancel)
+        load_button = message_box.addButton(QMessageBox.Ignore)
+        load_button.setText(self.tr("Load anyway"))
+
+        return message_box.exec_()
+
     @pyqtSlot(Asset)
     def loadAsset(self, asset):
         """ Load the content of the file given in parameter
@@ -412,19 +427,8 @@ class AssetWidget(QWidget):
         do_load = False
 
         if not is_valid:
-            message_box = QMessageBox(
-                QMessageBox.Critical,
-                self.tr("Invalid asset"),
-                self.tr(f"The asset you are trying to load is invalid."),
-            )
-            message_box.setDetailedText(f"{errors}")
-            message_box.addButton(QMessageBox.Cancel)
-            load_button = message_box.addButton(QMessageBox.Ignore)
-            load_button.setText(self.tr("Load anyway"))
-
-            result = message_box.exec_()
+            result = self.confirm_loading(errors)
             do_load = result == QMessageBox.Ignore
-
         else:
             do_load = True