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pytest-asyncio が入っているのに非同期関数のテストがスキップされる。

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問題

pytest-asyncio が入っているのに pytest を実行すると以下のような警告が出て、非同期関数のテストがスキップされました。

============================= test session starts ==============================
platform linux -- Python 3.11.4, pytest-7.4.0, pluggy-1.2.0
rootdir: /src
plugins: anyio-3.7.1, asyncio-0.21.1
asyncio: mode=Mode.STRICT
collected 3 items / 2 deselected / 1 selected

tests/test_main.py s                                                     [100%]

=============================== warnings summary ===============================
~~ 略 ~~
PytestUnhandledCoroutineWarning: async def functions are not natively supported and have been skipped.

~~ 略 ~~

================= 1 skipped, 2 deselected, 6 warnings in 3.54s =================

原因と対処法

非同期関数のテスト用のデコレーターの付け忘れでした。
以下のように非同期関数の定義の前にデコレーターを付けました。

@pytest.mark.asyncio
async def <任意の関数名>():
    ~~ 略 ~~

結果

以下のようにうまくテストが実行されました。

============================= test session starts ==============================
platform linux -- Python 3.11.4, pytest-7.4.0, pluggy-1.2.0
rootdir: /src
plugins: anyio-3.7.1, asyncio-0.21.1
asyncio: mode=Mode.STRICT
collected 3 items / 2 deselected / 1 selected

tests/test_main.py .                                                     [100%]

~~ 略 ~~

================= 1 passed, 2 deselected, 7 warnings in 4.20s ==================
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