Update pytest fixture for async functions

[jneo8]

Starting from pytest-asyncio's most recent release (version 0.19.0), strict mode is enforced by default 1, which requires the usage of @pytest.mark.asyncio and @pytest_asyncio.fixture 2. Without these markers, tests and fixtures are not considered as asyncio-driven, resulting functional tests failures.

For charms using pytest framework, we need to update their functional tests by replacing the current used @pytest.fixture with @pytest_asyncio.fixture in test files.

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Imported from Launchpad using lp2gh.

• date created: 2022-08-02T16:34:07Z

• owner: txiao

• assignee: txiao

• the launchpad url