Drop aiounittest dependency, use stdlib IsolatedAsyncioTestCase

[Copilot]

aiounittest is broken on Python 3.14 and unmaintained since 2022. Everything it provides has been available in unittest.IsolatedAsyncioTestCase since Python 3.8.

Changes

• tests/util.py: Replace aiounittest.AsyncTestCase with unittest.IsolatedAsyncioTestCase; remove the now-unnecessary __getattribute__ override that manually dispatched async setUp/tearDown
• tests/test_web_v0.py, tests/test_web_v1.py: Rename async def setUp/tearDown → async def asyncSetUp/asyncTearDown — IsolatedAsyncioTestCase runs setUp/tearDown synchronously via contextvars.Context.run() and only awaits the asyncSetUp/asyncTearDown variants
• pyproject.toml: Remove aiounittest>=1.5.0 from dev dependencies
• uv.lock: Remove aiounittest package entry

# Before
class AsyncTestCaseSetup(aiounittest.AsyncTestCase):
    async def setUp(self): ...
    async def tearDown(self): ...
    def __getattribute__(self, name): ...  # manual async dispatch

# After
class AsyncTestCaseSetup(unittest.IsolatedAsyncioTestCase):
    async def asyncSetUp(self): ...
    async def asyncTearDown(self): ...

Original prompt

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This section details on the original issue you should resolve

<issue_title>Drop aiounittest test dependency (broken on Python 3.14)</issue_title>
<issue_description>Home Assistant 2026.3 moved to Python 3.14, which means yalexs' test suite can't be built anymore. aiounittest doesn't support 3.14 and looks like it won't anytime soon (kwarunek/aiounittest#28, last release was 2022).

Everything aiounittest does has been in the stdlib since Python 3.8 via unittest.IsolatedAsyncioTestCase, so it should be a straightforward swap.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Drop aiounittest test dependency (broken on Python 3.14) #33

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[nielstron]

Looks good to me