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async_case.py

import asyncio
import contextvars
import inspect
import warnings

from .case import TestCase

class IsolatedAsyncioTestCase(TestCase):
    # Names intentionally have a long prefix
    # to reduce a chance of clashing with user-defined attributes
    # from inherited test case
    #
    # The class doesn't call loop.run_until_complete(self.setUp()) and family
    # but uses a different approach:
    # 1. create a long-running task that reads self.setUp()
    #    awaitable from queue along with a future
    # 2. await the awaitable object passing in and set the result
    #    into the future object
    # 3. Outer code puts the awaitable and the future object into a queue
    #    with waiting for the future
    # The trick is necessary because every run_until_complete() call
    # creates a new task with embedded ContextVar context.
    # To share contextvars between setUp(), test and tearDown() we need to execute
    # them inside the same task.

# Note: the test case modifies event loop policy if the policy was not instantiated
    # yet.
    # asyncio.get_event_loop_policy() creates a default policy on demand but never
    # returns None
    # I believe this is not an issue in user level tests but python itself for testing
    # should reset a policy in every test module
    # by calling asyncio.set_event_loop_policy(None) in tearDownModule()

def __init__(self, methodName='runTest'):
        super().__init__(methodName)
        self._asyncioRunner = None
        self._asyncioTestContext = contextvars.copy_context()

async def asyncSetUp(self):
        pass

async def asyncTearDown(self):
        pass

def addAsyncCleanup(self, func, /, *args, **kwargs):
        # A trivial trampoline to addCleanup()
        # the function exists because it has a different semantics
        # and signature:
        # addCleanup() accepts regular functions
        # but addAsyncCleanup() accepts coroutines
        #
        # We intentionally don't add inspect.iscoroutinefunction() check
        # for func argument because there is no way
        # to check for async function reliably:
        # 1. It can be "async def func()" itself
        # 2. Class can implement "async def __call__()" method
        # 3. Regular "def func()" that returns awaitable object
        self.addCleanup(*(func, *args), **kwargs)

async def enterAsyncContext(self, cm):
        """Enters the supplied asynchronous context manager.

If successful, also adds its __aexit__ method as a cleanup
        function and returns the result of the __aenter__ method.
        """
        # We look up the special methods on the type to match the with
        # statement.
        cls = type(cm)
        try:
            enter = cls.__aenter__
            exit = cls.__aexit__
        except AttributeError:
            raise TypeError(f"'{cls.__module__}.{cls.__qualname__}' object does "
                            f"not support the asynchronous context manager protocol"
                           ) from None
        result = await enter(cm)
        self.addAsyncCleanup(exit, cm, None, None, None)
        return result

def _callSetUp(self):
        # Force loop to be initialized and set as the current loop
        # so that setUp functions can use get_event_loop() and get the
        # correct loop instance.
        self._asyncioRunner.get_loop()
        self._asyncioTestContext.run(self.setUp)
        self._callAsync(self.asyncSetUp)

def _callTestMethod(self, method):
        if self._callMaybeAsync(method) is not None:
            warnings.warn(f'It is deprecated to return a value that is not None from a '
                          f'test case ({method})', DeprecationWarning, stacklevel=4)

def _callTearDown(self):
        self._callAsync(self.asyncTearDown)
        self._asyncioTestContext.run(self.tearDown)

def _callCleanup(self, function, *args, **kwargs):
        self._callMaybeAsync(function, *args, **kwargs)

def _callAsync(self, func, /, *args, **kwargs):
        assert self._asyncioRunner is not None, 'asyncio runner is not initialized'
        assert inspect.iscoroutinefunction(func), f'{func!r} is not an async function'
        return self._asyncioRunner.run(
            func(*args, **kwargs),
            context=self._asyncioTestContext
        )

def _callMaybeAsync(self, func, /, *args, **kwargs):
        assert self._asyncioRunner is not None, 'asyncio runner is not initialized'
        if inspect.iscoroutinefunction(func):
            return self._asyncioRunner.run(
                func(*args, **kwargs),
                context=self._asyncioTestContext,
            )
        else:
            return self._asyncioTestContext.run(func, *args, **kwargs)

def _setupAsyncioRunner(self):
        assert self._asyncioRunner is None, 'asyncio runner is already initialized'
        runner = asyncio.Runner(debug=True)
        self._asyncioRunner = runner

def _tearDownAsyncioRunner(self):
        runner = self._asyncioRunner
        runner.close()

def run(self, result=None):
        self._setupAsyncioRunner()
        try:
            return super().run(result)
        finally:
            self._tearDownAsyncioRunner()

def debug(self):
        self._setupAsyncioRunner()
        super().debug()
        self._tearDownAsyncioRunner()

def __del__(self):
        if self._asyncioRunner is not None:
            self._tearDownAsyncioRunner()

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2026-02-08 11:41:51
..	dir	-	root/linksafe	0755	2026-02-08 11:41:51
__pycache__	dir	-	root/linksafe	0755	2026-02-08 11:41:51
__init__.py	text/plain	3.84 KB	root/linksafe	0644	2025-10-09 04:16:55
__main__.py	text/plain	472 B	root/linksafe	0644	2025-10-09 04:16:55
_log.py	text/x-script.python	2.68 KB	root/linksafe	0644	2025-10-09 04:16:55
async_case.py	text/x-script.python	5.34 KB	root/linksafe	0644	2025-10-09 04:16:55
case.py	text/plain	57.13 KB	root/linksafe	0644	2025-10-09 04:16:55
loader.py	text/plain	22.01 KB	root/linksafe	0644	2025-10-09 04:16:55
main.py	text/plain	11.15 KB	root/linksafe	0644	2025-10-09 04:16:55
mock.py	text/x-script.python	101.82 KB	root/linksafe	0644	2025-10-09 04:16:55
result.py	text/plain	8.32 KB	root/linksafe	0644	2025-10-09 04:16:55
runner.py	text/plain	9.2 KB	root/linksafe	0644	2025-10-09 04:16:55
signals.py	text/x-script.python	2.35 KB	root/linksafe	0644	2025-10-09 04:16:55
suite.py	text/plain	13.2 KB	root/linksafe	0644	2025-10-09 04:16:55
util.py	text/plain	5.09 KB	root/linksafe	0644	2025-10-09 04:16:55

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