diff --git a/tests/unit/samples/wiringstringids/resourceclosing.py b/tests/unit/samples/wiringstringids/resourceclosing.py
index 6d9888ee..b692c488 100644
--- a/tests/unit/samples/wiringstringids/resourceclosing.py
+++ b/tests/unit/samples/wiringstringids/resourceclosing.py
@@ -64,7 +64,7 @@ class Container(containers.DeclarativeContainer):
 
 class ContainerSingleton(containers.DeclarativeContainer):
 
-    singleton = providers.Resource(Singleton)
+    singleton = providers.Singleton(Singleton)
     service = providers.Resource(
         init_service_with_singleton,
         singleton
@@ -83,12 +83,16 @@ def test_function(service: Service = Closing[Provide["service"]]):
 
 
 @inject
-def test_function_dependency(factory: FactoryService = Closing[Provide["factory_service"]]):
+def test_function_dependency(
+    factory: FactoryService = Closing[Provide["factory_service"]]
+):
     return factory
 
 
 @inject
-def test_function_dependency_kwargs(factory: FactoryService = Closing[Provide["factory_service_kwargs"]]):
+def test_function_dependency_kwargs(
+    factory: FactoryService = Closing[Provide["factory_service_kwargs"]]
+):
     return factory
 
 
diff --git a/tests/unit/wiring/string_ids/test_main_py36.py b/tests/unit/wiring/string_ids/test_main_py36.py
index aed9364d..2861c3aa 100644
--- a/tests/unit/wiring/string_ids/test_main_py36.py
+++ b/tests/unit/wiring/string_ids/test_main_py36.py
@@ -33,7 +33,10 @@ def subcontainer():
     container.unwire()
 
 
-@fixture(params=[resourceclosing.Container, resourceclosing.ContainerSingleton])
+@fixture(params=[
+    resourceclosing.Container,
+    resourceclosing.ContainerSingleton,
+])
 def resourceclosing_container(request):
     container = request.param()
     container.wire(modules=[resourceclosing])