Format with latest black

tests/test_class.py

@@ -2959,6 +2959,7 @@ def test_class_volatile():
         )
     )
 
+
 def test_class_mutable():
     content = """
       class Foo

tests/test_fn.py

@@ -822,6 +822,7 @@ def test_fn_trailing_return_std_function():
         )
     )
 
+
 def test_inline_volatile_fn():
     content = """
       inline int Standard_Atomic_Increment (volatile int* theValue);