fixing flaky tests

.circleci/config.yml

@@ -542,6 +542,7 @@ jobs:
                 --cov=litellm \
                 --cov-report=xml \
                 -n 4 \
+                --dist=loadscope \
                 --junitxml=test-results/junit.xml \
                 --durations=5 \
                 -vv"

tests/local_testing/test_router_utils.py

@@ -265,7 +265,7 @@ async def test_call_router_callbacks_on_success():
                 )
                 assert increment["increment_value"] == 1
 
-
+@pytest.mark.serial
 @pytest.mark.asyncio
 async def test_call_router_callbacks_on_failure():
     router = Router(