diff --git a/test/integration_test.py b/test/integration_test.py
index 674408720d..3dca6c709e 100644
--- a/test/integration_test.py
+++ b/test/integration_test.py
@@ -23,7 +23,8 @@ def test_icon_fcgroup():
 
 
 def test_icon_extra_config_args():
-    spack_spec("icon extra-config-args=--disable-new_feature,--enable-old_config_arg")
+    spack_spec(
+        "icon extra-config-args=--disable-new_feature,--enable-old_config_arg")
 
 
 def test_int2lm_parallel():
diff --git a/test/spack_commands.py b/test/spack_commands.py
index fcf3fce8f6..93998f146e 100644
--- a/test/spack_commands.py
+++ b/test/spack_commands.py
@@ -6,11 +6,11 @@
 REPO_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..")
 PACKAGES_DIR = os.path.join(REPO_DIR, "repo", "packages")
 ALL_PACKAGES = [
-    name
-    for name in os.listdir(PACKAGES_DIR)
+    name for name in os.listdir(PACKAGES_DIR)
     if os.path.isdir(os.path.join(PACKAGES_DIR, name))
 ]
 
+
 def time_format(seconds) -> str:
     "Returns a string formatted as 'XXh YYm ZZ.ZZs'."
 
diff --git a/test/unit_test.py b/test/unit_test.py
index 140ecde699..e024555fe9 100644
--- a/test/unit_test.py
+++ b/test/unit_test.py
@@ -3,6 +3,7 @@
 
 
 class TimeFormatTest(unittest.TestCase):
+
     def test_example(self):
         self.assertEqual(time_format(0.123), "0.12s")
         self.assertEqual(time_format(123.456), "2m 3.46s")
diff --git a/tools/package_overlap.py b/tools/package_overlap.py
index 4088530521..4a970fd06d 100644
--- a/tools/package_overlap.py
+++ b/tools/package_overlap.py
@@ -1,4 +1,5 @@
 import os
+
 spack = set(os.listdir("./spack/var/spack/repos/builtin/packages"))
 spack_c2sm = set(os.listdir("./repo/packages"))