Fixed Python 3.8 compatibility bugs; classmethod+property workaround; control session buffer

.github/workflows/main.yaml

@@ -7,6 +7,7 @@ jobs:
     strategy:
       matrix:
         python-version:
+        - '3.8'
         - '3.9'
         - '3.10'
     steps:

.readthedocs.yaml

@@ -2,7 +2,7 @@ version: 2
 build:
   os: 'ubuntu-20.04'
   tools:
-    python: '3.9'
+    python: '3.8'
 python:
   install:
     - method: pip

README.md

@@ -74,7 +74,7 @@ pip install asyncio-taskpool
 
 ## Dependencies
 
-Python Version 3.9+, tested on Linux
+Python Version 3.8+, tested on Linux
 
 ## Testing
 

docs/source/api/asyncio_taskpool.control.parser.rst

@@ -1,7 +0,0 @@
-asyncio\_taskpool.control.parser module
-=======================================
-
-.. automodule:: asyncio_taskpool.control.parser
-   :members:
-   :undoc-members:
-   :show-inheritance:

docs/source/api/asyncio_taskpool.control.rst

@@ -13,6 +13,4 @@ Submodules
    :maxdepth: 4
 
    asyncio_taskpool.control.client
-   asyncio_taskpool.control.parser
    asyncio_taskpool.control.server
-   asyncio_taskpool.control.session

docs/source/api/asyncio_taskpool.control.session.rst

@@ -1,7 +0,0 @@
-asyncio\_taskpool.control.session module
-========================================
-
-.. automodule:: asyncio_taskpool.control.session
-   :members:
-   :undoc-members:
-   :show-inheritance:

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = asyncio-taskpool
-version = 1.0.0
+version = 1.0.1
 author = Daniil Fajnberg
 author_email = mail@daniil.fajnberg.de
 description = Dynamically manage pools of asyncio tasks
@@ -25,7 +25,7 @@ classifiers =
 package_dir =
     = src
 packages = find:
-python_requires = >=3.9
+python_requires = >=3.8
 
 [options.extras_require]
 dev =

src/asyncio_taskpool/control/client.py

@@ -97,21 +97,22 @@ class ControlClient(ABC):
             writer: The `asyncio.StreamWriter` returned by the `_open_connection()` method
 
         Returns:
-            `None`, if either `Ctrl+C` was hit, or the user wants the client to disconnect;
+            `None`, if either `Ctrl+C` was hit, an empty or whitespace-only string was entered, or the user wants the
-            otherwise, the user's input, stripped of leading and trailing spaces and converted to lowercase.
+            client to disconnect; otherwise, returns the user's input, stripped of leading and trailing spaces and
+            converted to lowercase.
         """
         try:
-            msg = input("> ").strip().lower()
+            cmd = input("> ").strip().lower()
         except EOFError:  # Ctrl+D shall be equivalent to the :const:`CLIENT_EXIT` command.
-            msg = CLIENT_EXIT
+            cmd = CLIENT_EXIT
         except KeyboardInterrupt:  # Ctrl+C shall simply reset to the input prompt.
             print()
             return
-        if msg == CLIENT_EXIT:
+        if cmd == CLIENT_EXIT:
             writer.close()
             self._connected = False
             return
-        return msg
+        return cmd or None  # will be None if `cmd` is an empty string
 
     async def _interact(self, reader: StreamReader, writer: StreamWriter) -> None:
         """

src/asyncio_taskpool/control/parser.py

@@ -17,19 +17,21 @@ If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Definition of the :class:`ControlParser` used in a 
 :class:`ControlSession <asyncio_taskpool.control.session.ControlSession>`.
+
+It should not be considered part of the public API.
 """
 
 
 import logging
 from argparse import Action, ArgumentParser, ArgumentDefaultsHelpFormatter, HelpFormatter, ArgumentTypeError, SUPPRESS
 from ast import literal_eval
-from asyncio.streams import StreamWriter
 from inspect import Parameter, getmembers, isfunction, signature
+from io import StringIO
 from shutil import get_terminal_size
 from typing import Any, Callable, Container, Dict, Iterable, Set, Type, TypeVar
 
 from ..exceptions import HelpRequested, ParserError
-from ..internals.constants import CLIENT_INFO, CMD, STREAM_WRITER
+from ..internals.constants import CLIENT_INFO, CMD
 from ..internals.helpers import get_first_doc_line, resolve_dotted_path
 from ..internals.types import ArgsT, CancelCB, CoroutineFunc, EndCB, KwArgsT
 
@@ -52,8 +54,8 @@ class ControlParser(ArgumentParser):
     """
     Subclass of the standard :code:`argparse.ArgumentParser` for pool control.
 
-    Such a parser is not supposed to ever print to stdout/stderr, but instead direct all messages to a `StreamWriter`
+    Such a parser is not supposed to ever print to stdout/stderr, but instead direct all messages to a file-like
-    instance passed to it during initialization.
+    `StringIO` instance passed to it during initialization.
     Furthermore, it requires defining the width of the terminal, to adjust help formatting to the terminal size of a
     connected client.
     Finally, it offers some convenience methods and makes use of custom exceptions.
@@ -87,25 +89,23 @@ class ControlParser(ArgumentParser):
                 super().__init__(*args, **kwargs)
         return ClientHelpFormatter
 
-    def __init__(self, stream_writer: StreamWriter, terminal_width: int = None, **kwargs) -> None:
+    def __init__(self, stream: StringIO, terminal_width: int = None, **kwargs) -> None:
         """
         Sets some internal attributes in addition to the base class.
 
         Args:
-            stream_writer:
+            stream:
-                The instance of the :class:`asyncio.StreamWriter` to use for message output.
+                A file-like I/O object to use for message output.
             terminal_width (optional):
                 The terminal width to use for all message formatting. By default the :code:`columns` attribute from
                 :func:`shutil.get_terminal_size` is taken.
             **kwargs(optional):
                 Passed to the parent class constructor. The exception is the `formatter_class` parameter: Even if a
                 class is specified, it will always be subclassed in the :meth:`help_formatter_factory`.
-                Also, by default, `exit_on_error` is set to `False` (as opposed to how the parent class handles it).
         """
-        self._stream_writer: StreamWriter = stream_writer
+        self._stream: StringIO = stream
         self._terminal_width: int = terminal_width if terminal_width is not None else get_terminal_size().columns
         kwargs['formatter_class'] = self.help_formatter_factory(self._terminal_width, kwargs.get('formatter_class'))
-        kwargs.setdefault('exit_on_error', False)
         super().__init__(**kwargs)
         self._flags: Set[str] = set()
         self._commands = None
@@ -194,7 +194,7 @@ class ControlParser(ArgumentParser):
             Dictionary mapping class member names to the (sub-)parsers created from them.
         """
         parsers: ParsersDict = {}
-        common_kwargs = {STREAM_WRITER: self._stream_writer, CLIENT_INFO.TERMINAL_WIDTH: self._terminal_width}
+        common_kwargs = {'stream': self._stream, CLIENT_INFO.TERMINAL_WIDTH: self._terminal_width}
         for name, member in getmembers(cls):
             if name in omit_members or (name.startswith('_') and public_only):
                 continue
@@ -214,9 +214,9 @@ class ControlParser(ArgumentParser):
         return self._commands
 
     def _print_message(self, message: str, *args, **kwargs) -> None:
-        """This is overridden to ensure that no messages are sent to stdout/stderr, but always to the stream writer."""
+        """This is overridden to ensure that no messages are sent to stdout/stderr, but always to the stream buffer."""
         if message:
-            self._stream_writer.write(message.encode())
+            self._stream.write(message)
 
     def exit(self, status: int = 0, message: str = None) -> None:
         """This is overridden to prevent system exit to be invoked."""

src/asyncio_taskpool/control/server.py

@@ -31,6 +31,7 @@ from typing import Optional, Union
 from .client import ControlClient, TCPControlClient, UnixControlClient
 from .session import ControlSession
 from ..pool import AnyTaskPoolT
+from ..internals.helpers import classmethod
 from ..internals.types import ConnectedCallbackT, PathT
 
 

src/asyncio_taskpool/control/session.py

@@ -16,6 +16,8 @@ If not, see <https://www.gnu.org/licenses/>."""
 
 __doc__ = """
 Definition of the :class:`ControlSession` used by a :class:`ControlServer`.
+
+It should not be considered part of the public API.
 """
 
 
@@ -24,12 +26,13 @@ import json
 from argparse import ArgumentError
 from asyncio.streams import StreamReader, StreamWriter
 from inspect import isfunction, signature
+from io import StringIO
 from typing import Callable, Optional, Union, TYPE_CHECKING
 
 from .parser import ControlParser
 from ..exceptions import CommandError, HelpRequested, ParserError
 from ..pool import TaskPool, SimpleTaskPool
-from ..internals.constants import CLIENT_INFO, CMD, CMD_OK, SESSION_MSG_BYTES, STREAM_WRITER
+from ..internals.constants import CLIENT_INFO, CMD, CMD_OK, SESSION_MSG_BYTES
 from ..internals.helpers import return_or_exception
 
 if TYPE_CHECKING:
@@ -72,6 +75,7 @@ class ControlSession:
         self._reader: StreamReader = reader
         self._writer: StreamWriter = writer
         self._parser: Optional[ControlParser] = None
+        self._response_buffer: StringIO = StringIO()
 
     async def _exec_method_and_respond(self, method: Callable, **kwargs) -> None:
         """
@@ -133,7 +137,7 @@ class ControlSession:
         client_info = json.loads((await self._reader.read(SESSION_MSG_BYTES)).decode().strip())
         log.debug("%s connected", self._client_class_name)
         parser_kwargs = {
-            STREAM_WRITER: self._writer,
+            'stream': self._response_buffer,
             CLIENT_INFO.TERMINAL_WIDTH: client_info[CLIENT_INFO.TERMINAL_WIDTH],
             'prog': '',
             'usage': f'[-h] [{CMD}] ...'
@@ -160,7 +164,7 @@ class ControlSession:
             kwargs = vars(self._parser.parse_args(msg.split(' ')))
         except ArgumentError as e:
             log.debug("%s got an ArgumentError", self._client_class_name)
-            self._writer.write(str(e).encode())
+            self._response_buffer.write(str(e))
             return
         except (HelpRequested, ParserError):
             log.debug("%s received usage help", self._client_class_name)
@@ -171,7 +175,7 @@ class ControlSession:
         elif isinstance(command, property):
             await self._exec_property_and_respond(command, **kwargs)
         else:
-            self._writer.write(str(CommandError(f"Unknown command object: {command}")).encode())
+            self._response_buffer.write(str(CommandError(f"Unknown command object: {command}")))
 
     async def listen(self) -> None:
         """
@@ -188,4 +192,8 @@ class ControlSession:
                 log.debug("%s disconnected", self._client_class_name)
                 break
             await self._parse_command(msg)
+            response = self._response_buffer.getvalue()
+            self._response_buffer.seek(0)
+            self._response_buffer.truncate()
+            self._writer.write(response.encode())
             await self._writer.drain()

src/asyncio_taskpool/internals/constants.py

@@ -27,7 +27,6 @@ DEFAULT_TASK_GROUP = 'default'
 
 SESSION_MSG_BYTES = 1024 * 100
 
-STREAM_WRITER = 'stream_writer'
 CMD = 'command'
 CMD_OK = b"ok"
 

src/asyncio_taskpool/internals/helpers.py

@@ -19,10 +19,12 @@ Miscellaneous helper functions. None of these should be considered part of the p
 """
 
 
+import builtins
+import sys
 from asyncio.coroutines import iscoroutinefunction
 from importlib import import_module
 from inspect import getdoc
-from typing import Any, Optional, Union
+from typing import Any, Callable, Optional, Type, Union
 
 from .types import T, AnyCallableT, ArgsT, KwArgsT
 
@@ -131,3 +133,25 @@ def resolve_dotted_path(dotted_path: str) -> object:
             import_module(module_name)
             found = getattr(found, name)
     return found
+
+
+class ClassMethodWorkaround:
+    """Dirty workaround to make the `@classmethod` decorator work with properties."""
+
+    def __init__(self, method_or_property: Union[Callable, property]) -> None:
+        if isinstance(method_or_property, property):
+            self._getter = method_or_property.fget
+        else:
+            self._getter = method_or_property
+
+    def __get__(self, obj: Union[T, None], cls: Union[Type[T], None]) -> Any:
+        if obj is None:
+            return self._getter(cls)
+        return self._getter(obj)
+
+
+# Starting with Python 3.9, this is thankfully no longer necessary.
+if sys.version_info[:2] < (3, 9):
+    classmethod = ClassMethodWorkaround
+else:
+    classmethod = builtins.classmethod

tests/test_control/test___main__.py

@@ -38,7 +38,7 @@ class CLITestCase(IsolatedAsyncioTestCase):
         mock_client = MagicMock(start=mock_client_start)
         mock_client_cls = MagicMock(return_value=mock_client)
         mock_client_kwargs = {'foo': 123, 'bar': 456, 'baz': 789}
-        mock_parse_cli.return_value = {module.CLIENT_CLASS: mock_client_cls} | mock_client_kwargs
+        mock_parse_cli.return_value = {module.CLIENT_CLASS: mock_client_cls, **mock_client_kwargs}
         self.assertIsNone(await module.main())
         mock_parse_cli.assert_called_once_with()
         mock_client_cls.assert_called_once_with(**mock_client_kwargs)

tests/test_control/test_parser.py

@@ -41,9 +41,9 @@ class ControlParserTestCase(TestCase):
         self.help_formatter_factory_patcher = patch.object(parser.ControlParser, 'help_formatter_factory')
         self.mock_help_formatter_factory = self.help_formatter_factory_patcher.start()
         self.mock_help_formatter_factory.return_value = RawTextHelpFormatter
-        self.stream_writer, self.terminal_width = MagicMock(), 420
+        self.stream, self.terminal_width = MagicMock(), 420
         self.kwargs = {
-            'stream_writer': self.stream_writer,
+            'stream': self.stream,
             'terminal_width': self.terminal_width,
             'formatter_class': FOO
         }
@@ -72,10 +72,9 @@ class ControlParserTestCase(TestCase):
 
     def test_init(self):
         self.assertIsInstance(self.parser, ArgumentParser)
-        self.assertEqual(self.stream_writer, self.parser._stream_writer)
+        self.assertEqual(self.stream, self.parser._stream)
         self.assertEqual(self.terminal_width, self.parser._terminal_width)
         self.mock_help_formatter_factory.assert_called_once_with(self.terminal_width, FOO)
-        self.assertFalse(getattr(self.parser, 'exit_on_error'))
         self.assertEqual(RawTextHelpFormatter, getattr(self.parser, 'formatter_class'))
         self.assertSetEqual(set(), self.parser._flags)
         self.assertIsNone(self.parser._commands)
@@ -89,7 +88,7 @@ class ControlParserTestCase(TestCase):
         mock_get_first_doc_line.return_value = mock_help = 'help 123'
         kwargs = {FOO: 1, BAR: 2, parser.DESCRIPTION: FOO + BAR}
         expected_name = 'foo-bar'
-        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: mock_help} | kwargs
+        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: mock_help, **kwargs}
         to_omit = ['abc', 'xyz']
         output = self.parser.add_function_command(foo_bar, omit_params=to_omit, **kwargs)
         self.assertEqual(mock_subparser, output)
@@ -107,7 +106,7 @@ class ControlParserTestCase(TestCase):
         mock_get_first_doc_line.return_value = mock_help = 'help 123'
         kwargs = {FOO: 1, BAR: 2, parser.DESCRIPTION: FOO + BAR}
         expected_name = 'get-prop'
-        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: mock_help} | kwargs
+        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: mock_help, **kwargs}
         output = self.parser.add_property_command(prop, **kwargs)
         self.assertEqual(mock_subparser, output)
         mock_get_first_doc_line.assert_called_once_with(get_prop)
@@ -119,7 +118,7 @@ class ControlParserTestCase(TestCase):
 
         prop = property(get_prop, set_prop)
         expected_help = f"Get/set the `.{expected_name}` property"
-        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: expected_help} | kwargs
+        expected_kwargs = {parser.NAME: expected_name, parser.PROG: expected_name, parser.HELP: expected_help, **kwargs}
         output = self.parser.add_property_command(prop, **kwargs)
         self.assertEqual(mock_subparser, output)
         mock_get_first_doc_line.assert_has_calls([call(get_prop), call(set_prop)])
@@ -152,8 +151,7 @@ class ControlParserTestCase(TestCase):
         mock_subparser = MagicMock(set_defaults=mock_set_defaults)
         mock_add_function_command.return_value = mock_add_property_command.return_value = mock_subparser
         x = 'x'
-        common_kwargs = {parser.STREAM_WRITER: self.parser._stream_writer,
+        common_kwargs = {'stream': self.parser._stream, parser.CLIENT_INFO.TERMINAL_WIDTH: self.parser._terminal_width}
-                         parser.CLIENT_INFO.TERMINAL_WIDTH: self.parser._terminal_width}
         expected_output = {'method': mock_subparser, 'prop': mock_subparser}
         output = self.parser.add_class_commands(FooBar, public_only=True, omit_members=['to_omit'], member_arg_name=x)
         self.assertDictEqual(expected_output, output)
@@ -170,12 +168,12 @@ class ControlParserTestCase(TestCase):
         mock_base_add_subparsers.assert_called_once_with(*args, **kwargs)
 
     def test__print_message(self):
-        self.stream_writer.write = MagicMock()
+        self.stream.write = MagicMock()
         self.assertIsNone(self.parser._print_message(''))
-        self.stream_writer.write.assert_not_called()
+        self.stream.write.assert_not_called()
         msg = 'foo bar baz'
         self.assertIsNone(self.parser._print_message(msg))
-        self.stream_writer.write.assert_called_once_with(msg.encode())
+        self.stream.write.assert_called_once_with(msg)
 
     @patch.object(parser.ControlParser, '_print_message')
     def test_exit(self, mock__print_message: MagicMock):

tests/test_control/test_session.py

@@ -21,11 +21,12 @@ Unittests for the `asyncio_taskpool.session` module.
 
 import json
 from argparse import ArgumentError, Namespace
+from io import StringIO
 from unittest import IsolatedAsyncioTestCase
 from unittest.mock import AsyncMock, MagicMock, patch, call
 
 from asyncio_taskpool.control import session
-from asyncio_taskpool.internals.constants import CLIENT_INFO, CMD, SESSION_MSG_BYTES, STREAM_WRITER
+from asyncio_taskpool.internals.constants import CLIENT_INFO, CMD, SESSION_MSG_BYTES
 from asyncio_taskpool.exceptions import HelpRequested
 from asyncio_taskpool.pool import SimpleTaskPool
 
@@ -61,14 +62,15 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         self.assertEqual(self.mock_reader, self.session._reader)
         self.assertEqual(self.mock_writer, self.session._writer)
         self.assertIsNone(self.session._parser)
+        self.assertIsInstance(self.session._response_buffer, StringIO)
 
     @patch.object(session, 'return_or_exception')
     async def test__exec_method_and_respond(self, mock_return_or_exception: AsyncMock):
         def method(self, arg1, arg2, *var_args, **rest): pass
         test_arg1, test_arg2, test_var_args, test_rest = 123, 'xyz', [0.1, 0.2, 0.3], {'aaa': 1, 'bbb': 11}
-        kwargs = {'arg1': test_arg1, 'arg2': test_arg2, 'var_args': test_var_args} | test_rest
+        kwargs = {'arg1': test_arg1, 'arg2': test_arg2, 'var_args': test_var_args}
         mock_return_or_exception.return_value = None
-        self.assertIsNone(await self.session._exec_method_and_respond(method, **kwargs))
+        self.assertIsNone(await self.session._exec_method_and_respond(method, **kwargs, **test_rest))
         mock_return_or_exception.assert_awaited_once_with(
             method, self.mock_pool, test_arg1, test_arg2, *test_var_args, **test_rest
         )
@@ -104,7 +106,7 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         self.mock_reader.read = mock_read
         self.mock_writer.drain = AsyncMock()
         expected_parser_kwargs = {
-            STREAM_WRITER: self.mock_writer,
+            'stream': self.session._response_buffer,
             CLIENT_INFO.TERMINAL_WIDTH: width,
             'prog': '',
             'usage': f'[-h] [{CMD}] ...'
@@ -132,10 +134,9 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         kwargs = {FOO: BAR, 'hello': 'python'}
         mock_parse_args = MagicMock(return_value=Namespace(**{CMD: method}, **kwargs))
         self.session._parser = MagicMock(parse_args=mock_parse_args)
-        self.mock_writer.write = MagicMock()
         self.assertIsNone(await self.session._parse_command(msg))
         mock_parse_args.assert_called_once_with(msg.split(' '))
-        self.mock_writer.write.assert_not_called()
+        self.assertEqual('', self.session._response_buffer.getvalue())
         mock__exec_method_and_respond.assert_awaited_once_with(method, **kwargs)
         mock__exec_property_and_respond.assert_not_called()
 
@@ -145,7 +146,7 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         mock_parse_args.return_value = Namespace(**{CMD: prop}, **kwargs)
         self.assertIsNone(await self.session._parse_command(msg))
         mock_parse_args.assert_called_once_with(msg.split(' '))
-        self.mock_writer.write.assert_not_called()
+        self.assertEqual('', self.session._response_buffer.getvalue())
         mock__exec_method_and_respond.assert_not_called()
         mock__exec_property_and_respond.assert_awaited_once_with(prop, **kwargs)
 
@@ -161,26 +162,28 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         mock_parse_args.assert_called_once_with(msg.split(' '))
         mock__exec_method_and_respond.assert_not_called()
         mock__exec_property_and_respond.assert_not_called()
-        self.mock_writer.write.assert_called_once_with(str(exc).encode())
+        self.assertEqual(str(exc), self.session._response_buffer.getvalue())
 
         mock__exec_property_and_respond.reset_mock()
         mock_parse_args.reset_mock()
-        self.mock_writer.write.reset_mock()
+        self.session._response_buffer.seek(0)
+        self.session._response_buffer.truncate()
 
         mock_parse_args.side_effect = exc = ArgumentError(MagicMock(), "oops")
         self.assertIsNone(await self.session._parse_command(msg))
         mock_parse_args.assert_called_once_with(msg.split(' '))
-        self.mock_writer.write.assert_called_once_with(str(exc).encode())
+        self.assertEqual(str(exc), self.session._response_buffer.getvalue())
         mock__exec_method_and_respond.assert_not_awaited()
         mock__exec_property_and_respond.assert_not_awaited()
 
-        self.mock_writer.write.reset_mock()
         mock_parse_args.reset_mock()
+        self.session._response_buffer.seek(0)
+        self.session._response_buffer.truncate()
 
         mock_parse_args.side_effect = HelpRequested()
         self.assertIsNone(await self.session._parse_command(msg))
         mock_parse_args.assert_called_once_with(msg.split(' '))
-        self.mock_writer.write.assert_not_called()
+        self.assertEqual('', self.session._response_buffer.getvalue())
         mock__exec_method_and_respond.assert_not_awaited()
         mock__exec_property_and_respond.assert_not_awaited()
 
@@ -191,17 +194,23 @@ class ControlServerTestCase(IsolatedAsyncioTestCase):
         self.mock_writer.drain = AsyncMock(side_effect=make_reader_return_empty)
         msg = "fascinating"
         self.mock_reader.read = AsyncMock(return_value=f' {msg} '.encode())
+        response = FOO + BAR + FOO
+        self.session._response_buffer.write(response)
         self.assertIsNone(await self.session.listen())
         self.mock_reader.read.assert_has_awaits([call(SESSION_MSG_BYTES), call(SESSION_MSG_BYTES)])
         mock__parse_command.assert_awaited_once_with(msg)
+        self.assertEqual('', self.session._response_buffer.getvalue())
+        self.mock_writer.write.assert_called_once_with(response.encode())
         self.mock_writer.drain.assert_awaited_once_with()
 
         self.mock_reader.read.reset_mock()
         mock__parse_command.reset_mock()
+        self.mock_writer.write.reset_mock()
         self.mock_writer.drain.reset_mock()
 
         self.mock_server.is_serving = MagicMock(return_value=False)
         self.assertIsNone(await self.session.listen())
         self.mock_reader.read.assert_not_awaited()
         mock__parse_command.assert_not_awaited()
+        self.mock_writer.write.assert_not_called()
         self.mock_writer.drain.assert_not_awaited()

tests/test_internals/test_helpers.py

@@ -19,7 +19,7 @@ Unittests for the `asyncio_taskpool.helpers` module.
 """
 
 
-from unittest import IsolatedAsyncioTestCase
+from unittest import IsolatedAsyncioTestCase, TestCase
 from unittest.mock import MagicMock, AsyncMock, NonCallableMagicMock, call, patch
 
 from asyncio_taskpool.internals import helpers
@@ -122,3 +122,33 @@ class HelpersTestCase(IsolatedAsyncioTestCase):
             with self.assertRaises(AttributeError):
                 helpers.resolve_dotted_path('foo.bar.baz')
             mock_import_module.assert_has_calls([call('foo'), call('foo.bar')])
+
+
+class ClassMethodWorkaroundTestCase(TestCase):
+    def test_init(self):
+        def func(): return 'foo'
+        def getter(): return 'bar'
+        prop = property(getter)
+        instance = helpers.ClassMethodWorkaround(func)
+        self.assertIs(func, instance._getter)
+        instance = helpers.ClassMethodWorkaround(prop)
+        self.assertIs(getter, instance._getter)
+
+    @patch.object(helpers.ClassMethodWorkaround, '__init__', return_value=None)
+    def test_get(self, _mock_init: MagicMock):
+        def func(x: MagicMock): return x.__name__
+        instance = helpers.ClassMethodWorkaround(MagicMock())
+        instance._getter = func
+        obj, cls = None, MagicMock
+        expected_output = 'MagicMock'
+        output = instance.__get__(obj, cls)
+        self.assertEqual(expected_output, output)
+
+        obj = MagicMock(__name__='bar')
+        expected_output = 'bar'
+        output = instance.__get__(obj, cls)
+        self.assertEqual(expected_output, output)
+
+        cls = None
+        output = instance.__get__(obj, cls)
+        self.assertEqual(expected_output, output)

tests/test_pool.py

@@ -729,13 +729,15 @@ class SimpleTaskPoolTestCase(CommonTestCase):
     TEST_POOL_CANCEL_CB = MagicMock()
 
     def get_task_pool_init_params(self) -> dict:
-        return super().get_task_pool_init_params() | {
+        params = super().get_task_pool_init_params()
+        params.update({
             'func': self.TEST_POOL_FUNC,
             'args': self.TEST_POOL_ARGS,
             'kwargs': self.TEST_POOL_KWARGS,
             'end_callback': self.TEST_POOL_END_CB,
             'cancel_callback': self.TEST_POOL_CANCEL_CB,
-        }
+        })
+        return params
 
     def setUp(self) -> None:
         self.base_class_init_patcher = patch.object(pool.BaseTaskPool, '__init__')