Smoke tests for assorted plugins (#7721)

Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>
Co-authored-by: Thomas Grainger <tagrain@gmail.com>
Co-authored-by: Kyle Altendorf <sda@fstab.net>

testing/plugins_integration/pytest_anyio_integration.py

@@ -0,0 +1,8 @@
+import anyio
+
+import pytest
+
+
+@pytest.mark.anyio
+async def test_sleep():
+    await anyio.sleep(0)