message: fixed matching with empty tag sets

tests/test_chat.py

@@ -202,7 +202,25 @@ class TestChatDB(unittest.TestCase):
         self.assertEqual(chat_db.messages[1].file_path,
                          pathlib.Path(self.db_path.name, '0003.txt'))
 
-    def test_chat_db_filter(self) -> None:
+    def test_chat_db_from_dir_filter_tags(self) -> None:
+        chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
+                                  pathlib.Path(self.db_path.name),
+                                  mfilter=MessageFilter(tags_or={Tag('tag1')}))
+        self.assertEqual(len(chat_db.messages), 1)
+        self.assertEqual(chat_db.cache_path, pathlib.Path(self.cache_path.name))
+        self.assertEqual(chat_db.db_path, pathlib.Path(self.db_path.name))
+        self.assertEqual(chat_db.messages[0].file_path,
+                         pathlib.Path(self.db_path.name, '0001.txt'))
+
+    def test_chat_db_from_dir_filter_tags_empty(self) -> None:
+        chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
+                                  pathlib.Path(self.db_path.name),
+                                  mfilter=MessageFilter(tags_or=set(),
+                                                        tags_and=set(),
+                                                        tags_not=set()))
+        self.assertEqual(len(chat_db.messages), 0)
+
+    def test_chat_db_from_dir_filter_answer(self) -> None:
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                                   pathlib.Path(self.db_path.name),
                                   mfilter=MessageFilter(answer_contains='Answer 2'))
@@ -213,7 +231,7 @@ class TestChatDB(unittest.TestCase):
                          pathlib.Path(self.db_path.name, '0002.yaml'))
         self.assertEqual(chat_db.messages[0].answer, 'Answer 2')
 
-    def test_chat_db_from_messges(self) -> None:
+    def test_chat_db_from_messages(self) -> None:
         chat_db = ChatDB.from_messages(pathlib.Path(self.cache_path.name),
                                        pathlib.Path(self.db_path.name),
                                        messages=[self.message1, self.message2,

tests/test_message.py

@@ -300,6 +300,12 @@ This is a question.
                                     MessageFilter(tags_or={Tag('tag1')}))
         self.assertIsNone(message)
 
+    def test_from_file_txt_empty_tags_dont_match(self) -> None:
+        message = Message.from_file(self.file_path_min,
+                                    MessageFilter(tags_or=set(),
+                                                  tags_and=set()))
+        self.assertIsNone(message)
+
     def test_from_file_txt_no_tags_match_tags_not(self) -> None:
         message = Message.from_file(self.file_path_min,
                                     MessageFilter(tags_not={Tag('tag1')}))