chat: added functions for finding and deleting messages

tests/test_chat.py

@@ -62,6 +62,28 @@ class TestChat(CmmTestCase):
         tags_freq = self.chat.tags_frequency()
         self.assertDictEqual(tags_freq, {'atag1': 1, 'btag2': 2})
 
+    def test_find_remove_messages(self) -> None:
+        self.chat.add_messages([self.message1, self.message2])
+        msgs = self.chat.find_messages(['0001.txt'])
+        self.assertListEqual(msgs, [self.message1])
+        msgs = self.chat.find_messages(['0001.txt', '0002.txt'])
+        self.assertListEqual(msgs, [self.message1, self.message2])
+        # add new Message with full path
+        message3 = Message(Question('Question 2'),
+                           Answer('Answer 2'),
+                           {Tag('btag2')},
+                           file_path=pathlib.Path('/foo/bla/0003.txt'))
+        self.chat.add_messages([message3])
+        # find new Message by full path
+        msgs = self.chat.find_messages(['/foo/bla/0003.txt'])
+        self.assertListEqual(msgs, [message3])
+        # find Message with full path only by filename
+        msgs = self.chat.find_messages(['0003.txt'])
+        self.assertListEqual(msgs, [message3])
+        # remove last message
+        self.chat.remove_messages(['0003.txt'])
+        self.assertListEqual(self.chat.messages, [self.message1, self.message2])
+
     @patch('sys.stdout', new_callable=StringIO)
     def test_print(self, mock_stdout: StringIO) -> None:
         self.chat.add_messages([self.message1, self.message2])