diff --git a/tests/conftest.py b/tests/conftest.py
index 5eaf2aa..80fc1f7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,7 +12,7 @@
 @pytest.fixture
 async def app() -> fastapi.FastAPI:
     app_ = fastapi.FastAPI()
-    container = modern_di.Container(groups=[Dependencies])
+    container = modern_di.Container(groups=[Dependencies], validate=True)
     modern_di_fastapi.setup_di(app_, container=container)
     return app_
 
diff --git a/tests/test_lifespan.py b/tests/test_lifespan.py
index d24f1a8..7c0f5d9 100644
--- a/tests/test_lifespan.py
+++ b/tests/test_lifespan.py
@@ -39,7 +39,7 @@ async def user_lifespan(app_: fastapi.FastAPI) -> typing.AsyncIterator[dict[str,
         events.append("shutdown")
 
     app = fastapi.FastAPI(lifespan=user_lifespan)
-    container = modern_di.Container(groups=[Dependencies])
+    container = modern_di.Container(groups=[Dependencies], validate=True)
     modern_di_fastapi.setup_di(app, container)
 
     @app.get("/")