Add LAST_MODIFIED attribute when exporting (#860)

* add LAST_MODIFIED attribute when exporting

* complement test_exporter for LAST_MODIFIED attribute

* parse LAST_MODIFIED attribute when importing

* use bookmark date_added when no modified date is parsed, otherwise use parsed datetime.

* complement test_parser and test_importer for LAST_MODIFIED attribute

* cleanup tests a bit

---------

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/tests/helpers.py

@@ -45,6 +45,7 @@ class BookmarkFactoryMixin:
         favicon_file: str = "",
         preview_image_file: str = "",
         added: datetime = None,
+        modified: datetime = None,
     ):
         if title is None:
             title = get_random_string(length=32)
@@ -57,13 +58,15 @@ class BookmarkFactoryMixin:
             url = "https://example.com/" + unique_id
         if added is None:
             added = timezone.now()
+        if modified is None:
+            modified = timezone.now()
         bookmark = Bookmark(
             url=url,
             title=title,
             description=description,
             notes=notes,
             date_added=added,
-            date_modified=timezone.now(),
+            date_modified=modified,
             owner=user,
             is_archived=is_archived,
             unread=unread,
@@ -320,6 +323,7 @@ class BookmarkHtmlTag:
         title: str = "",
         description: str = "",
         add_date: str = "",
+        last_modified: str = "",
         tags: str = "",
         to_read: bool = False,
         private: bool = True,
@@ -328,6 +332,7 @@ class BookmarkHtmlTag:
         self.title = title
         self.description = description
         self.add_date = add_date
+        self.last_modified = last_modified
         self.tags = tags
         self.to_read = to_read
         self.private = private
@@ -339,6 +344,7 @@ class ImportTestMixin:
         <DT>
         <A {f'HREF="{tag.href}"' if tag.href else ''}
            {f'ADD_DATE="{tag.add_date}"' if tag.add_date else ''}
+           {f'LAST_MODIFIED="{tag.last_modified}"' if tag.last_modified else ''}
            {f'TAGS="{tag.tags}"' if tag.tags else ''}
            TOREAD="{1 if tag.to_read else 0}"
            PRIVATE="{1 if tag.private else 0}">