diff --git a/tests/conftest.py b/tests/conftest.py
index 6c02e56..d9b75c0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,7 +12,7 @@
 @pytest.fixture
 def app() -> Starlette:
     app_ = Starlette()
-    container = modern_di.Container(groups=[Dependencies])
+    container = modern_di.Container(groups=[Dependencies], validate=True)
     modern_di_starlette.setup_di(app_, container=container)
     return app_
 
diff --git a/tests/test_lifespan.py b/tests/test_lifespan.py
index 3a79f92..53aea31 100644
--- a/tests/test_lifespan.py
+++ b/tests/test_lifespan.py
@@ -40,7 +40,7 @@ async def user_lifespan(app_: Starlette) -> typing.AsyncIterator[dict[str, str]]
         events.append("shutdown")
 
     app = Starlette(lifespan=user_lifespan)
-    container = modern_di.Container(groups=[Dependencies])
+    container = modern_di.Container(groups=[Dependencies], validate=True)
     modern_di_starlette.setup_di(app, container)
 
     async def read_marker(request: Request) -> JSONResponse: