[tests] Disable trio backend for AnyIO

backend/setup.cfg

@@ -66,7 +66,6 @@ commands =
 deps =
     pytest
     pytest-asyncio
-    trio
 commands =
     pytest tests
 

backend/tests/conftest.py

@@ -25,6 +25,11 @@ def client():
     return TestClient(app)
 
 
+@fixture(scope="module")
+def anyio_backend():
+    return "asyncio"
+
+
 @fixture(scope="module")
 def asyncclient():
     Mapping.drop_all()

setup.sh

@@ -6,4 +6,4 @@ ln -sf ../../git-hooks/commit-msg .git/hooks/commit-msg
 
 # create virtualenv
 virtualenv -p $(which python3.10) backend/.venv
-backend/.venv/bin/pip install tox black pytest pytest-aiohttp trio
+backend/.venv/bin/pip install tox black pytest pytest-aiohttp