diff --git a/.github/workflows/pre-commit.yaml b/.github/workflows/pre-commit.yaml
new file mode 100644
index 00000000..f46e01d4
--- /dev/null
+++ b/.github/workflows/pre-commit.yaml
@@ -0,0 +1,14 @@
+name: pre-commit
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v3
+    - uses: pre-commit/action@v3.0.0
diff --git a/custom_components/adaptive_lighting/switch.py b/custom_components/adaptive_lighting/switch.py
index bf064f73..59c110f6 100755
--- a/custom_components/adaptive_lighting/switch.py
+++ b/custom_components/adaptive_lighting/switch.py
@@ -169,12 +169,14 @@ BRIGHTNESS_ATTRS = {
 # Keep a short domain version for the context instances (which can only be 36 chars)
 _DOMAIN_SHORT = "adapt_lgt"
 
+
 def _int_to_bytes(i: int, signed: bool = False) -> bytes:
     bits = i.bit_length()
     if signed:
         # Make room for the sign bit.
         bits += 1
-    return i.to_bytes((bits + 7) // 8, 'little', signed=signed)
+    return i.to_bytes((bits + 7) // 8, "little", signed=signed)
+
 
 def _short_hash(string: str, length: int = 4) -> str:
     """Create a hash of 'string' with length 'length'."""
diff --git a/tests/test_switch.py b/tests/test_switch.py
index 6773c2d1..2038fe8d 100644
--- a/tests/test_switch.py
+++ b/tests/test_switch.py
@@ -33,13 +33,11 @@ from homeassistant.components.adaptive_lighting.const import (
 )
 from homeassistant.components.adaptive_lighting.switch import (
     _attributes_have_changed,
-    _expand_light_groups,
     color_difference_redmean,
     create_context,
     is_our_context,
 )
 from homeassistant.components.demo.light import DemoLight
-from homeassistant.components.group import DOMAIN as GROUP_DOMAIN
 from homeassistant.components.light import (
     ATTR_BRIGHTNESS,
     ATTR_BRIGHTNESS_PCT,