diff --git a/src/websockets/datastructures.py b/src/websockets/datastructures.py
index c2a5acfe..aef11bf2 100644
--- a/src/websockets/datastructures.py
+++ b/src/websockets/datastructures.py
@@ -172,11 +172,9 @@ class SupportsKeysAndGetItem(Protocol):  # pragma: no cover
 
     """
 
-    def keys(self) -> Iterable[str]:
-        ...
+    def keys(self) -> Iterable[str]: ...
 
-    def __getitem__(self, key: str) -> str:
-        ...
+    def __getitem__(self, key: str) -> str: ...
 
 
 HeadersLike = Union[
diff --git a/tests/test_protocol.py b/tests/test_protocol.py
index a1661231..b53c8a1e 100644
--- a/tests/test_protocol.py
+++ b/tests/test_protocol.py
@@ -37,12 +37,14 @@ def assertFrameSent(self, connection, frame, eof=False):
 
         """
         frames_sent = [
-            None
-            if write is SEND_EOF
-            else self.parse(
-                write,
-                mask=connection.side is CLIENT,
-                extensions=connection.extensions,
+            (
+                None
+                if write is SEND_EOF
+                else self.parse(
+                    write,
+                    mask=connection.side is CLIENT,
+                    extensions=connection.extensions,
+                )
             )
             for write in connection.data_to_send()
         ]