diff --git a/async_asgi_testclient/exceptions.py b/async_asgi_testclient/exceptions.py
index a02efe9..5e0636c 100644
--- a/async_asgi_testclient/exceptions.py
+++ b/async_asgi_testclient/exceptions.py
@@ -4,9 +4,8 @@
 (and in some cases, possible at all) to handle errors in different
 ways.
 """
-from typing import Optional
-
 from async_asgi_testclient.utils import Message
+from typing import Optional
 
 
 class TestClientError(Exception):
diff --git a/async_asgi_testclient/testing.py b/async_asgi_testclient/testing.py
index 8c75af3..bc18d3b 100644
--- a/async_asgi_testclient/testing.py
+++ b/async_asgi_testclient/testing.py
@@ -111,7 +111,9 @@ async def send_lifespan(self, action):
         message = await receive(self._lifespan_output_queue, timeout=self.timeout)
 
         if isinstance(message, Message):
-            raise TestClientError(f"{message.event} - {message.reason} - {message.task}", message=message)
+            raise TestClientError(
+                f"{message.event} - {message.reason} - {message.task}", message=message
+            )
 
         if message["type"] == f"lifespan.{action}.complete":
             pass
@@ -272,7 +274,10 @@ async def open(
         message = await self.wait_response(receive_or_fail, "http.response.start")
         response.status_code = message["status"]
         response.headers = CIMultiDict(
-            [(k.decode("utf8"), v.decode("utf8")) for k, v in message.get("headers", [])]
+            [
+                (k.decode("utf8"), v.decode("utf8"))
+                for k, v in message.get("headers", [])
+            ]
         )
 
         # Receive initial response body
diff --git a/async_asgi_testclient/websocket.py b/async_asgi_testclient/websocket.py
index c5fae5f..95e0f7f 100644
--- a/async_asgi_testclient/websocket.py
+++ b/async_asgi_testclient/websocket.py
@@ -113,7 +113,7 @@ async def connect(self):
             headers.add("Cookie", cookie_jar.output(header=""))
 
         scope = {
-            "asgi": {"version": "3.0", },
+            "asgi": {"version": "3.0",},
             "type": "websocket",
             "headers": flatten_headers(headers),
             "path": path,