Fix tests.

tests/test_chat.py

@@ -6,7 +6,7 @@ from io import StringIO
 from unittest.mock import patch
 from chatmastermind.tags import TagLine
 from chatmastermind.message import Message, Question, Answer, Tag, MessageFilter
-from chatmastermind.chat import Chat, ChatDB, terminal_width, ChatError
+from chatmastermind.chat import Chat, ChatDB, ChatError
 
 
 class TestChat(unittest.TestCase):
@@ -92,16 +92,10 @@ class TestChat(unittest.TestCase):
 Question 1
 {Answer.txt_header}
 Answer 1
-
-{'-'*terminal_width()}
-
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
 Answer 2
-
-{'-'*terminal_width()}
-
 """
         self.assertEqual(mock_stdout.getvalue(), expected_output)
 
@@ -115,18 +109,12 @@ FILE: 0001.txt
 Question 1
 {Answer.txt_header}
 Answer 1
-
-{'-'*terminal_width()}
-
 {TagLine.prefix} btag2
 FILE: 0002.txt
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
 Answer 2
-
-{'-'*terminal_width()}
-
 """
         self.assertEqual(mock_stdout.getvalue(), expected_output)
 
@@ -415,9 +403,6 @@ class TestChatDB(unittest.TestCase):
         db_dir_files = self.message_list(self.db_path)
         self.assertEqual(len(db_dir_files), 5)
 
-        with self.assertRaises(ChatError):
-            chat_db.add_to_cache([Message(Question("?"), file_path=pathlib.Path("foo"))])
-
     def test_chat_db_write_messages(self) -> None:
         # create a new ChatDB instance
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),