diff --git a/tests/test_black.py b/tests/test_black.py
index 078cf3f..1a85d0b 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -32,7 +32,6 @@ class BlackTestCase(unittest.TestCase):
     @unittest.skipIf(os.environ.get("SKIP_LINTERS"), "requested via SKIP_LINTERS env variable")
     def test_black(self):
         """Test: Run black code formatter on Python source code."""
-
         cmd = ["black", "--check", "--diff"] + get_source_files()
         if unittest_verbosity() >= 2:
             sys.stderr.write(f"Running following command:\n{' '.join(cmd)}\n")
diff --git a/tests/test_isort.py b/tests/test_isort.py
index 30683fc..34720ac 100644
--- a/tests/test_isort.py
+++ b/tests/test_isort.py
@@ -32,7 +32,6 @@ class IsortTestCase(unittest.TestCase):
     @unittest.skipIf(os.environ.get("SKIP_LINTERS"), "requested via SKIP_LINTERS env variable")
     def test_isort(self):
         """Test: Run isort on Python source code."""
-
         cmd = ["isort", "--check-only", "--diff"] + get_source_files()
         if unittest_verbosity() >= 2:
             sys.stderr.write(f"Running following command:\n{' '.join(cmd)}\n")
diff --git a/tests/test_pylint.py b/tests/test_pylint.py
index 030f56c..f5e25e9 100644
--- a/tests/test_pylint.py
+++ b/tests/test_pylint.py
@@ -36,7 +36,6 @@ class PylintTestCase(unittest.TestCase):
 
     def test_pylint(self):
         """Test: Run pylint on Python source code."""
-
         cmd = ["pylint", "--rcfile=" + CONFIG, "--"] + get_source_files()
         if os.environ.get("SKIP_LINTERS"):
             cmd.insert(2, "--errors-only")