Add tests for file widget

import_export_extensions/widgets.py

@@ -284,20 +284,30 @@ class FileWidget(CharWidget):
     def __init__(self, filename: str):
         self.filename = filename
 
-    def render(self, value: Model, *args, **kwargs) -> typing.Optional[str]:
+    def render(
+        self,
+        value: typing.Optional[Model],
+        *args,
+        **kwargs,
+    ) -> typing.Optional[str]:
         """Convert DB value to URL to file."""
         if not value:
-            return None  # pragma: no cover
+            return None
 
         if self._get_default_storage() == DEFAULT_SYSTEM_STORAGE:
             return f"http://localhost:8000{value.url}"
 
         return value.url
 
-    def clean(self, value: str, *args, **kwargs) -> typing.Optional[str]:
+    def clean(
+        self,
+        value: typing.Optional[str],
+        *args,
+        **kwargs,
+    ) -> typing.Optional[str]:
         """Get the file and check for exists."""
         if not value:
-            return None  # pragma: no cover
+            return None
 
         internal_url = utils.url_to_internal_value(urlparse(value).path)
 

tests/test_widgets/test_widgets.py

@@ -396,3 +396,15 @@ def test_file_widget_clean_non_existed_url(mocker: MockerFixture):
     widget = FileWidget(filename="import_file")
     cleaned_result = widget.clean(value="http://testdownload.org/file.csv")
     assert isinstance(cleaned_result, File)
+
+
+def test_file_widget_render_none():
+    """Test file widget render return None if no value provided."""
+    widget = FileWidget(filename="import_file")
+    assert widget.render(None) is None
+
+
+def test_file_widget_clean_none():
+    """Test file widget clean return None if no value provided."""
+    widget = FileWidget(filename="import_file")
+    assert widget.clean(None) is None