test: port session and video tests off sync io

[bdraco]

Description of change

Drains the _KNOWN_BLOCKING xfail list from the blockbuster PR by porting the 17 remaining tests off sync IO. The session and CSRF tests in tests/test_api.py now write and read their config files via small async_write_bytes/async_read_bytes/async_write_text/async_read_text helpers added to tests/conftest.py (thin aiofiles wrappers), and path.exists checks switch to aiofiles.os.path.exists; test_get_camera_video swaps the NamedTemporaryFile write for aiofiles into a tmp_path and runs the PyAV validate through asyncio.to_thread; test_write_json follows the same pattern.

After this _KNOWN_BLOCKING is empty, the autouse blockbuster fixture passes for the whole suite, and pre-commit run -a is clean.

Pull-Request Checklist

• Code is up-to-date with the main branch
• This pull request follows the contributing guidelines.
• This pull request links relevant issues as Fixes #0000 N/A
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change N/A
• The pull request title follows the conventional commit spec, such as "fix(api): prevent racing of requests" (PRs are squash-merged, so the title becomes the commit on main).

• If pre-commit.ci is failing, try pre-commit run -a for further information.
• If CI / test is failing, try poetry run pytest for further information.

Summary by CodeRabbit

• Tests
  • Test infrastructure updated to use asynchronous file operations.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e3293a7b-3fb8-4c4d-b53c-e7fa19fc1d7a

📥 Commits

Reviewing files that changed from the base of the PR and between 93119ff and fa1357f.

📒 Files selected for processing (3)

• tests/conftest.py
• tests/test_api.py
• tests/test_utils.py

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📝 Walkthrough

Walkthrough

This PR migrates the test suite from synchronous blocking file I/O to non-blocking async file operations. New async helper functions are introduced in conftest, a blocker xfail list is cleared, and all file I/O calls in test_api and test_utils are updated to use awaited async operations.

Changes

Async File I/O Migration for Test Suite

Layer / File(s)	Summary
Async file I/O helpers and xfail cleanup tests/conftest.py	Adds aiofiles import, introduces four async helper functions (async_write_bytes, async_read_bytes, async_write_text, async_read_text) for non-blocking file reads/writes, and clears _KNOWN_BLOCKING frozenset since tests no longer have blocking I/O.
Migrate test_api.py to async file I/O tests/test_api.py	Imports async helpers; updates test_get_camera_video to use tmp_path with async_write_bytes and asyncio.to_thread for validation; switches session storage, authentication, and clear-session tests to use async file operations for all config file writes, reads, and existence checks.
Migrate test_utils.py to async file I/O tests/test_utils.py	Imports aiofiles.os and async_read_text; replaces synchronous path.exists() and path.read_text() checks with async equivalents in test_write_json.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 With async wings, the tests now fly,
No blocking calls to make time sigh,
aiofiles opens the way so clear,
Conftest helpers bring cheer and cheer! 🎉

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-blockbuster-tests

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[codspeed-hq]

Merging this PR will not alter performance

✅ 4 untouched benchmarks

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_{Comparing fix-blockbuster-tests (fa1357f) with main (93119ff)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 1 file with indirect coverage changes

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