[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/test_app.py

@@ -5,6 +5,7 @@
 3. in run_once, come up with a way to verify the behavior you wanted.
 run_once runs your app through one cycle of the event loop and then terminates
 """
+
 import io
 import os
 from contextlib import redirect_stdout

tests/test_slack_command_bot_component.py

@@ -3,6 +3,7 @@
 1. Init the component.
 2. call .run()
 """
+
 import threading
 import time