pytest asyncio test skipped: anyio plugin setup

TL;DR

An async test gets skipped when no plugin claims it: either the anyio/asyncio plugin is not installed, or the test lacks the marker/fixture that tells the plugin to run it. Install anyio plus the pytest anyio plugin support, mark tests with pytest.mark.anyio, and provide the anyio_backend fixture (usually parametrized as asyncio) in conftest. Then check the skip reason in verbose output; "skipped" with no marker applied is the signature of this exact problem.

The query

pytest asyncio test skipped: anyio plugin setup

Use this when

• Async tests show as SKIPPED instead of running
• Setting up anyio-based async tests for the first time
• Tests pass locally but skip in CI (plugin missing from CI env)

Not for

• Async tests that run and fail
• Choosing between asyncio and trio backends
• Sync test skip markers (pytest.mark.skip)

Steps

1. Run with -v -rs to surface skip reasons and confirm the plugin is installed (pip show anyio, check installed pytest plugins). Expected output: skip reason shown; you confirm whether the anyio plugin is present.
2. Add the anyio_backend fixture to conftest (e.g. params ['asyncio']) and mark async tests with pytest.mark.anyio. Expected output: the plugin now claims the tests instead of skipping them.
3. Re-run the async tests and confirm they execute (PASSED/FAILED, not SKIPPED). Expected output: tests run; any failures are real test failures, not skips.
4. Pin the plugin in your test dependencies so CI installs it too. Expected output: CI runs the async tests instead of silently skipping them.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_Bq4OYrGtBvrM8uZmVJPnPw