Format with latest black

tests/test_class.py

@@ -2959,6 +2959,7 @@ def test_class_volatile():
         )
     )
 
+
 def test_class_mutable():
     content = """
       class Foo
@@ -2996,4 +2997,4 @@ def test_class_mutable():
                 )
             ]
         )
-    )
+    )

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);
@@ -855,4 +856,4 @@ def test_inline_volatile_fn():
                 )
             ]
         )
-    )
+    )