cmm: tags completion now uses 'Message.tags_from_dir' (fixes tag completion for me)

chatmastermind/ai.py

@@ -0,0 +1,64 @@
+from dataclasses import dataclass
+from abc import abstractmethod
+from typing import Protocol, Optional, Union
+from .configuration import AIConfig
+from .message import Message
+from .chat import Chat
+
+
+class AIError(Exception):
+    pass
+
+
+@dataclass
+class Tokens:
+    prompt: int = 0
+    completion: int = 0
+    total: int = 0
+
+
+@dataclass
+class AIResponse:
+    """
+    The response to an AI request. Consists of one or more messages
+    (each containing the question and a single answer) and the nr.
+    of used tokens.
+    """
+    messages: list[Message]
+    tokens: Optional[Tokens] = None
+
+
+class AI(Protocol):
+    """
+    The base class for AI clients.
+    """
+
+    name: str
+    config: AIConfig
+
+    @abstractmethod
+    def request(self,
+                question: Message,
+                context: Chat,
+                num_answers: int = 1) -> AIResponse:
+        """
+        Make an AI request, asking the given question with the given
+        context (i. e. chat history). The nr. of requested answers
+        corresponds to the nr. of messages in the 'AIResponse'.
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def models(self) -> list[str]:
+        """
+        Return all models supported by this AI.
+        """
+        raise NotImplementedError
+
+    def tokens(self, data: Union[Message, Chat]) -> int:
+        """
+        Computes the nr. of AI language tokens for the given message
+        or chat. Note that the computation may not be 100% accurate
+        and is not implemented for all AIs.
+        """
+        raise NotImplementedError

chatmastermind/ais/openai.py

@@ -0,0 +1,48 @@
+"""
+Implements the OpenAI client classes and functions.
+"""
+import openai
+from ..message import Message
+from ..chat import Chat
+from ..ai import AI, AIResponse
+
+
+class OpenAI(AI):
+    """
+    The OpenAI AI client.
+    """
+
+    def request(self,
+                question: Message,
+                context: Chat,
+                num_answers: int = 1) -> AIResponse:
+        """
+        Make an AI request, asking the given question with the given
+        context (i. e. chat history). The nr. of requested answers
+        corresponds to the nr. of messages in the 'AIResponse'.
+        """
+        # TODO:
+        # * transform given message and chat context into OpenAI format
+        # * make request
+        # * create a new Message for each answer and return them
+        # (writing Messages is done by the calles)
+        raise NotImplementedError
+
+    def models(self) -> list[str]:
+        """
+        Return all models supported by this AI.
+        """
+        raise NotImplementedError
+
+    def print_models(self) -> None:
+        """
+        Print all models supported by the current AI.
+        """
+        not_ready = []
+        for engine in sorted(openai.Engine.list()['data'], key=lambda x: x['id']):
+            if engine['ready']:
+                print(engine['id'])
+            else:
+                not_ready.append(engine['id'])
+        if len(not_ready) > 0:
+            print('\nNot ready: ' + ', '.join(not_ready))

chatmastermind/chat.py

@@ -45,7 +45,7 @@ def read_dir(dir_path: pathlib.Path,
     messages: list[Message] = []
     file_iter = dir_path.glob(glob) if glob else dir_path.iterdir()
     for file_path in sorted(file_iter):
-        if file_path.is_file():
+        if file_path.is_file() and file_path.suffix in Message.file_suffixes:
             try:
                 message = Message.from_file(file_path, mfilter)
                 if message:
@@ -127,7 +127,16 @@ class Chat:
         tags: set[Tag] = set()
         for m in self.messages:
             tags |= m.filter_tags(prefix, contain)
-        return tags
+        return set(sorted(tags))
+
+    def tags_frequency(self, prefix: Optional[str] = None, contain: Optional[str] = None) -> dict[Tag, int]:
+        """
+        Get the frequency of all tags of all messages, optionally filtered by prefix or substring.
+        """
+        tags: list[Tag] = []
+        for m in self.messages:
+            tags += [tag for tag in m.filter_tags(prefix, contain)]
+        return {tag: tags.count(tag) for tag in sorted(tags)}
 
     def tokens(self) -> int:
         """
@@ -136,27 +145,24 @@ class Chat:
         """
         return sum(m.tokens() for m in self.messages)
 
-    def print(self, dump: bool = False, source_code_only: bool = False,
+    def print(self, source_code_only: bool = False,
-              with_tags: bool = False, with_file: bool = False,
+              with_tags: bool = False, with_files: bool = False,
               paged: bool = True) -> None:
-        if dump:
-            pp(self)
-            return
         output: list[str] = []
         for message in self.messages:
             if source_code_only:
                 output.extend(source_code(message.question, include_delims=True))
                 continue
             output.append('-' * terminal_width())
+            if with_tags:
+                output.append(message.tags_str())
+            if with_files:
+                output.append('FILE: ' + str(message.file_path))
             output.append(Question.txt_header)
             output.append(message.question)
             if message.answer:
                 output.append(Answer.txt_header)
                 output.append(message.answer)
-            if with_tags:
-                output.append(message.tags_str())
-            if with_file:
-                output.append('FILE: ' + str(message.file_path))
         if paged:
             print_paged('\n'.join(output))
         else:

chatmastermind/configuration.py

@@ -7,7 +7,15 @@ OpenAIConfigInst = TypeVar('OpenAIConfigInst', bound='OpenAIConfig')
 
 
 @dataclass
-class OpenAIConfig():
+class AIConfig:
+    """
+    The base class of all AI configurations.
+    """
+    name: str
+
+
+@dataclass
+class OpenAIConfig(AIConfig):
     """
     The OpenAI section of the configuration file.
     """
@@ -25,6 +33,7 @@ class OpenAIConfig():
         Create OpenAIConfig from a dict.
         """
         return cls(
+            name='OpenAI',
             api_key=str(source['api_key']),
             model=str(source['model']),
             max_tokens=int(source['max_tokens']),
@@ -36,7 +45,7 @@ class OpenAIConfig():
 
 
 @dataclass
-class Config():
+class Config:
     """
     The configuration file structure.
     """

chatmastermind/main.py

@@ -6,11 +6,13 @@ import yaml
 import sys
 import argcomplete
 import argparse
-import pathlib
+from pathlib import Path
-from .utils import terminal_width, print_tag_args, print_chat_hist, display_source_code, print_tags_frequency, ChatType
+from .utils import terminal_width, print_tag_args, print_chat_hist, display_source_code, ChatType
-from .storage import save_answers, create_chat_hist, get_tags, get_tags_unique, read_file, dump_data
+from .storage import save_answers, create_chat_hist, read_file, dump_data
 from .api_client import ai, openai_api_key, print_models
 from .configuration import Config
+from .chat import ChatDB
+from .message import Message, MessageFilter
 from itertools import zip_longest
 from typing import Any
 
@@ -18,9 +20,8 @@ default_config = '.config.yaml'
 
 
 def tags_completer(prefix: str, parsed_args: Any, **kwargs: Any) -> list[str]:
-    with open(parsed_args.config, 'r') as f:
+    config = Config.from_file(parsed_args.config)
-        config = yaml.load(f, Loader=yaml.FullLoader)
+    return list(Message.tags_from_dir(Path(config.db), prefix=prefix))
-    return get_tags_unique(config, prefix)
 
 
 def create_question_with_hist(args: argparse.Namespace,
@@ -31,11 +32,11 @@ def create_question_with_hist(args: argparse.Namespace,
     by the specified tags.
     """
     tags = args.tags or []
-    extags = args.extags or []
+    etags = args.etags or []
     otags = args.output_tags or []
 
-    if not args.only_source_code:
+    if not args.source_code_only:
-        print_tag_args(tags, extags, otags)
+        print_tag_args(tags, etags, otags)
 
     question_parts = []
     question_list = args.question if args.question is not None else []
@@ -52,17 +53,23 @@ def create_question_with_hist(args: argparse.Namespace,
                 question_parts.append(f"```\n{r.read().strip()}\n```")
 
     full_question = '\n\n'.join(question_parts)
-    chat = create_chat_hist(full_question, tags, extags, config,
+    chat = create_chat_hist(full_question, tags, etags, config,
-                            args.match_all_tags, False, False)
+                            match_all_tags=True if args.atags else False,  # FIXME
+                            with_tags=False,
+                            with_file=False)
     return chat, full_question, tags
 
 
-def tag_cmd(args: argparse.Namespace, config: Config) -> None:
+def tags_cmd(args: argparse.Namespace, config: Config) -> None:
     """
-    Handler for the 'tag' command.
+    Handler for the 'tags' command.
     """
+    chat = ChatDB.from_dir(cache_path=Path('.'),
+                           db_path=Path(config.db))
     if args.list:
-        print_tags_frequency(get_tags(config, None))
+        tags_freq = chat.tags_frequency(args.prefix, args.contain)
+        for tag, freq in tags_freq.items():
+            print(f"- {tag}: {freq}")
 
 
 def config_cmd(args: argparse.Namespace, config: Config) -> None:
@@ -89,7 +96,7 @@ def ask_cmd(args: argparse.Namespace, config: Config) -> None:
     if args.model:
         config.openai.model = args.model
     chat, question, tags = create_question_with_hist(args, config)
-    print_chat_hist(chat, False, args.only_source_code)
+    print_chat_hist(chat, False, args.source_code_only)
     otags = args.output_tags or []
     answers, usage = ai(chat, config, args.number)
     save_answers(question, answers, tags, otags, config)
@@ -101,21 +108,23 @@ def hist_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'hist' command.
     """
-    tags = args.tags or []
-    extags = args.extags or []
 
-    chat = create_chat_hist(None, tags, extags, config,
+    mfilter = MessageFilter(tags_or=args.tags,
-                            args.match_all_tags,
+                            tags_and=args.atags,
+                            tags_not=args.etags)
+    chat = ChatDB.from_dir(Path('.'),
+                           Path(config.db),
+                           mfilter=mfilter)
+    chat.print(args.source_code_only,
                args.with_tags,
                args.with_files)
-    print_chat_hist(chat, args.dump, args.only_source_code)
 
 
 def print_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'print' command.
     """
-    fname = pathlib.Path(args.file)
+    fname = Path(args.file)
     if fname.suffix == '.yaml':
         with open(args.file, 'r') as f:
             data = yaml.load(f, Loader=yaml.FullLoader)
@@ -124,7 +133,7 @@ def print_cmd(args: argparse.Namespace, config: Config) -> None:
     else:
         print(f"Unknown file type: {args.file}")
         sys.exit(1)
-    if args.only_source_code:
+    if args.source_code_only:
         display_source_code(data['answer'])
     else:
         print(dump_data(data).strip())
@@ -144,18 +153,17 @@ def create_parser() -> argparse.ArgumentParser:
     # a parent parser for all commands that support tag selection
     tag_parser = argparse.ArgumentParser(add_help=False)
     tag_arg = tag_parser.add_argument('-t', '--tags', nargs='+',
-                                      help='List of tag names', metavar='TAGS')
+                                      help='List of tag names (one must match)', metavar='TAGS')
     tag_arg.completer = tags_completer  # type: ignore
-    extag_arg = tag_parser.add_argument('-e', '--extags', nargs='+',
+    atag_arg = tag_parser.add_argument('-a', '--atags', nargs='+',
-                                        help='List of tag names to exclude', metavar='EXTAGS')
+                                       help='List of tag names (all must match)', metavar='TAGS')
-    extag_arg.completer = tags_completer  # type: ignore
+    atag_arg.completer = tags_completer  # type: ignore
+    etag_arg = tag_parser.add_argument('-e', '--etags', nargs='+',
+                                       help='List of tag names to exclude', metavar='ETAGS')
+    etag_arg.completer = tags_completer  # type: ignore
     otag_arg = tag_parser.add_argument('-o', '--output-tags', nargs='+',
                                        help='List of output tag names, default is input', metavar='OTAGS')
     otag_arg.completer = tags_completer  # type: ignore
-    tag_parser.add_argument('-a', '--match-all-tags',
-                            help="All given tags must match when selecting chat history entries",
-                            action='store_true')
-    # enable autocompletion for tags
 
     # 'ask' command parser
     ask_cmd_parser = cmdparser.add_parser('ask', parents=[tag_parser],
@@ -170,7 +178,7 @@ def create_parser() -> argparse.ArgumentParser:
     ask_cmd_parser.add_argument('-n', '--number', help='Number of answers to produce', type=int,
                                 default=1)
     ask_cmd_parser.add_argument('-s', '--source', nargs='+', help='Source add content of a file to the query')
-    ask_cmd_parser.add_argument('-S', '--only-source-code', help='Add pure source code to the chat history',
+    ask_cmd_parser.add_argument('-S', '--source-code-only', help='Add pure source code to the chat history',
                                 action='store_true')
 
     # 'hist' command parser
@@ -178,23 +186,23 @@ def create_parser() -> argparse.ArgumentParser:
                                            help="Print chat history.",
                                            aliases=['h'])
     hist_cmd_parser.set_defaults(func=hist_cmd)
-    hist_cmd_parser.add_argument('-d', '--dump', help="Print chat history as Python structure",
-                                 action='store_true')
     hist_cmd_parser.add_argument('-w', '--with-tags', help="Print chat history with tags.",
                                  action='store_true')
     hist_cmd_parser.add_argument('-W', '--with-files', help="Print chat history with filenames.",
                                  action='store_true')
-    hist_cmd_parser.add_argument('-S', '--only-source-code', help='Print only source code',
+    hist_cmd_parser.add_argument('-S', '--source-code-only', help='Print only source code',
                                  action='store_true')
 
-    # 'tag' command parser
+    # 'tags' command parser
-    tag_cmd_parser = cmdparser.add_parser('tag',
+    tags_cmd_parser = cmdparser.add_parser('tags',
                                            help="Manage tags.",
                                            aliases=['t'])
-    tag_cmd_parser.set_defaults(func=tag_cmd)
+    tags_cmd_parser.set_defaults(func=tags_cmd)
-    tag_group = tag_cmd_parser.add_mutually_exclusive_group(required=True)
+    tags_group = tags_cmd_parser.add_mutually_exclusive_group(required=True)
-    tag_group.add_argument('-l', '--list', help="List all tags and their frequency",
+    tags_group.add_argument('-l', '--list', help="List all tags and their frequency",
                             action='store_true')
+    tags_cmd_parser.add_argument('-p', '--prefix', help="Filter tags by prefix")
+    tags_cmd_parser.add_argument('-c', '--contain', help="Filter tags by contained substring")
 
     # 'config' command parser
     config_cmd_parser = cmdparser.add_parser('config',
@@ -214,7 +222,7 @@ def create_parser() -> argparse.ArgumentParser:
                                             aliases=['p'])
     print_cmd_parser.set_defaults(func=print_cmd)
     print_cmd_parser.add_argument('-f', '--file', help='File to print', required=True)
-    print_cmd_parser.add_argument('-S', '--only-source-code', help='Print only source code',
+    print_cmd_parser.add_argument('-S', '--source-code-only', help='Print only source code',
                                   action='store_true')
 
     argcomplete.autocomplete(parser)

chatmastermind/message.py

@@ -128,29 +128,29 @@ class ModelLine(str):
         return cls(' '.join([cls.prefix, model]))
 
 
-class Question(str):
+class Answer(str):
     """
-    A single question with a defined header.
+    A single answer with a defined header.
     """
-    tokens: int = 0   # tokens used by this question
+    tokens: int = 0  # tokens used by this answer
-    txt_header: ClassVar[str] = '=== QUESTION ==='
+    txt_header: ClassVar[str] = '=== ANSWER ==='
-    yaml_key: ClassVar[str] = 'question'
+    yaml_key: ClassVar[str] = 'answer'
 
-    def __new__(cls: Type[QuestionInst], string: str) -> QuestionInst:
+    def __new__(cls: Type[AnswerInst], string: str) -> AnswerInst:
         """
-        Make sure the question string does not contain the header.
+        Make sure the answer string does not contain the header as a whole line.
         """
-        if cls.txt_header in string:
+        if cls.txt_header in string.split('\n'):
-            raise MessageError(f"Question '{string}' contains the header '{cls.txt_header}'")
+            raise MessageError(f"Answer '{string}' contains the header '{cls.txt_header}'")
         instance = super().__new__(cls, string)
         return instance
 
     @classmethod
-    def from_list(cls: Type[QuestionInst], strings: list[str]) -> QuestionInst:
+    def from_list(cls: Type[AnswerInst], strings: list[str]) -> AnswerInst:
         """
         Build Question from a list of strings. Make sure strings do not contain the header.
         """
-        if any(cls.txt_header in string for string in strings):
+        if cls.txt_header in strings:
             raise MessageError(f"Question contains the header '{cls.txt_header}'")
         instance = super().__new__(cls, '\n'.join(strings).strip())
         return instance
@@ -162,29 +162,33 @@ class Question(str):
         return source_code(self, include_delims)
 
 
-class Answer(str):
+class Question(str):
     """
-    A single answer with a defined header.
+    A single question with a defined header.
     """
-    tokens: int = 0  # tokens used by this answer
+    tokens: int = 0   # tokens used by this question
-    txt_header: ClassVar[str] = '=== ANSWER ==='
+    txt_header: ClassVar[str] = '=== QUESTION ==='
-    yaml_key: ClassVar[str] = 'answer'
+    yaml_key: ClassVar[str] = 'question'
 
-    def __new__(cls: Type[AnswerInst], string: str) -> AnswerInst:
+    def __new__(cls: Type[QuestionInst], string: str) -> QuestionInst:
         """
-        Make sure the answer string does not contain the header.
+        Make sure the question string does not contain the header as a whole line
+        (also not that from 'Answer', so it's always clear where the answer starts).
         """
-        if cls.txt_header in string:
+        string_lines = string.split('\n')
-            raise MessageError(f"Answer '{string}' contains the header '{cls.txt_header}'")
+        if cls.txt_header in string_lines:
+            raise MessageError(f"Question '{string}' contains the header '{cls.txt_header}'")
+        if Answer.txt_header in string_lines:
+            raise MessageError(f"Question '{string}' contains the header '{Answer.txt_header}'")
         instance = super().__new__(cls, string)
         return instance
 
     @classmethod
-    def from_list(cls: Type[AnswerInst], strings: list[str]) -> AnswerInst:
+    def from_list(cls: Type[QuestionInst], strings: list[str]) -> QuestionInst:
         """
         Build Question from a list of strings. Make sure strings do not contain the header.
         """
-        if any(cls.txt_header in string for string in strings):
+        if cls.txt_header in strings:
             raise MessageError(f"Question contains the header '{cls.txt_header}'")
         instance = super().__new__(cls, '\n'.join(strings).strip())
         return instance

chatmastermind/utils.py

@@ -78,8 +78,3 @@ def print_chat_hist(chat: ChatType, dump: bool = False, source_code: bool = Fals
             print(message['content'])
         else:
             print(f"{message['role'].upper()}: {message['content']}")
-
-
-def print_tags_frequency(tags: list[str]) -> None:
-    for tag in sorted(set(tags)):
-        print(f"- {tag}: {tags.count(tag)}")

tests/test_chat.py

@@ -14,7 +14,7 @@ class TestChat(CmmTestCase):
         self.chat = Chat([])
         self.message1 = Message(Question('Question 1'),
                                 Answer('Answer 1'),
-                                {Tag('atag1')},
+                                {Tag('atag1'), Tag('btag2')},
                                 file_path=pathlib.Path('0001.txt'))
         self.message2 = Message(Question('Question 2'),
                                 Answer('Answer 2'),
@@ -57,6 +57,11 @@ class TestChat(CmmTestCase):
         tags_cont = self.chat.tags(contain='2')
         self.assertSetEqual(tags_cont, {Tag('btag2')})
 
+    def test_tags_frequency(self) -> None:
+        self.chat.add_msgs([self.message1, self.message2])
+        tags_freq = self.chat.tags_frequency()
+        self.assertDictEqual(tags_freq, {'atag1': 1, 'btag2': 2})
+
     @patch('sys.stdout', new_callable=StringIO)
     def test_print(self, mock_stdout: StringIO) -> None:
         self.chat.add_msgs([self.message1, self.message2])
@@ -77,21 +82,21 @@ Answer 2
     @patch('sys.stdout', new_callable=StringIO)
     def test_print_with_tags_and_file(self, mock_stdout: StringIO) -> None:
         self.chat.add_msgs([self.message1, self.message2])
-        self.chat.print(paged=False, with_tags=True, with_file=True)
+        self.chat.print(paged=False, with_tags=True, with_files=True)
         expected_output = f"""{'-'*terminal_width()}
+{TagLine.prefix} atag1 btag2
+FILE: 0001.txt
 {Question.txt_header}
 Question 1
 {Answer.txt_header}
 Answer 1
-{TagLine.prefix} atag1
-FILE: 0001.txt
 {'-'*terminal_width()}
+{TagLine.prefix} btag2
+FILE: 0002.txt
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
 Answer 2
-{TagLine.prefix} btag2
-FILE: 0002.txt
 """
         self.assertEqual(mock_stdout.getvalue(), expected_output)
 

tests/test_main.py

@@ -115,11 +115,12 @@ class TestHandleQuestion(CmmTestCase):
         self.question = "test question"
         self.args = argparse.Namespace(
             tags=['tag1'],
-            extags=['extag1'],
+            atags=None,
+            etags=['etag1'],
             output_tags=None,
             question=[self.question],
             source=None,
-            only_source_code=False,
+            source_code_only=False,
             number=3,
             max_tokens=None,
             temperature=None,
@@ -143,16 +144,18 @@ class TestHandleQuestion(CmmTestCase):
         with patch("chatmastermind.storage.open", open_mock):
             ask_cmd(self.args, self.config)
             mock_print_tag_args.assert_called_once_with(self.args.tags,
-                                                        self.args.extags,
+                                                        self.args.etags,
                                                         [])
             mock_create_chat_hist.assert_called_once_with(self.question,
                                                           self.args.tags,
-                                                          self.args.extags,
+                                                          self.args.etags,
                                                           self.config,
-                                                          False, False, False)
+                                                          match_all_tags=False,
+                                                          with_tags=False,
+                                                          with_file=False)
             mock_print_chat_hist.assert_called_once_with('test_chat',
                                                          False,
-                                                         self.args.only_source_code)
+                                                         self.args.source_code_only)
             mock_ai.assert_called_with("test_chat",
                                        self.config,
                                        self.args.number)
@@ -227,7 +230,7 @@ class TestCreateParser(CmmTestCase):
             mock_add_subparsers.assert_called_once_with(dest='command', title='commands', description='supported commands', required=True)
             mock_cmdparser.add_parser.assert_any_call('ask', parents=ANY, help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('hist', parents=ANY, help=ANY, aliases=ANY)
-            mock_cmdparser.add_parser.assert_any_call('tag', help=ANY, aliases=ANY)
+            mock_cmdparser.add_parser.assert_any_call('tags', help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('config', help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('print', help=ANY, aliases=ANY)
             self.assertTrue('.config.yaml' in parser.get_default('config'))

tests/test_message.py

@@ -61,22 +61,39 @@ class SourceCodeTestCase(CmmTestCase):
 
 
 class QuestionTestCase(CmmTestCase):
-    def test_question_with_prefix(self) -> None:
+    def test_question_with_header(self) -> None:
         with self.assertRaises(MessageError):
-            Question("=== QUESTION === What is your name?")
+            Question(f"{Question.txt_header}\nWhat is your name?")
 
-    def test_question_without_prefix(self) -> None:
+    def test_question_with_answer_header(self) -> None:
+        with self.assertRaises(MessageError):
+            Question(f"{Answer.txt_header}\nBob")
+
+    def test_question_with_legal_header(self) -> None:
+        """
+        If the header is just a part of a line, it's fine.
+        """
+        question = Question(f"This is a line contaning '{Question.txt_header}'\nWhat does that mean?")
+        self.assertIsInstance(question, Question)
+        self.assertEqual(question, f"This is a line contaning '{Question.txt_header}'\nWhat does that mean?")
+
+    def test_question_without_header(self) -> None:
         question = Question("What is your favorite color?")
         self.assertIsInstance(question, Question)
         self.assertEqual(question, "What is your favorite color?")
 
 
 class AnswerTestCase(CmmTestCase):
-    def test_answer_with_prefix(self) -> None:
+    def test_answer_with_header(self) -> None:
         with self.assertRaises(MessageError):
-            Answer("=== ANSWER === Yes")
+            Answer(f"{Answer.txt_header}\nno")
 
-    def test_answer_without_prefix(self) -> None:
+    def test_answer_with_legal_header(self) -> None:
+        answer = Answer(f"This is a line contaning '{Answer.txt_header}'\nIt is what it is.")
+        self.assertIsInstance(answer, Answer)
+        self.assertEqual(answer, f"This is a line contaning '{Answer.txt_header}'\nIt is what it is.")
+
+    def test_answer_without_header(self) -> None:
         answer = Answer("No")
         self.assertIsInstance(answer, Answer)
         self.assertEqual(answer, "No")