diff --git a/tests/test_class_sh_basic.py b/tests/test_class_sh_basic.py
index a78d503f8..5d75e4811 100644
--- a/tests/test_class_sh_basic.py
+++ b/tests/test_class_sh_basic.py
@@ -76,8 +76,7 @@ def test_pass_unique_ptr_disowns(rtrn_atyp, pass_atyp, rtrn):
     with pytest.raises(RuntimeError) as exc_info:
         m.pass_uqmp_atyp(obj)
     assert str(exc_info.value) == (
-        "Missing value for wrapped C++ type:"
-        " Python instance was disowned."
+        "Missing value for wrapped C++ type: Python instance was disowned."
     )
 
 
diff --git a/tests/test_smart_ptr.py b/tests/test_smart_ptr.py
index 592556c9a..d4e8e2e06 100644
--- a/tests/test_smart_ptr.py
+++ b/tests/test_smart_ptr.py
@@ -304,7 +304,8 @@ def test_smart_ptr_from_default():
         m.HeldByDefaultHolder.load_shared_ptr(instance)
     assert str(excinfo.value) in (
         "Unable to load a smart-pointer type from a non-smart_holder instance.",
-        "Unable to load a custom holder type from a default-holder instance")
+        "Unable to load a custom holder type from a default-holder instance",
+    )
 
 
 def test_shared_ptr_gc():