diff --git a/test/test_flake8.py b/test/test_flake8.py
index eac16ee..d9f9ab3 100644
--- a/test/test_flake8.py
+++ b/test/test_flake8.py
@@ -19,7 +19,8 @@
 @pytest.mark.flake8
 @pytest.mark.linter
 def test_flake8() -> None:
-    rc, errors = main_with_errors(argv=[])
-    assert rc == 0, \
-        'Found %d code style errors / warnings:\n' % len(errors) + \
+    """Tests flake8 on this module."""
+    error_code, errors = main_with_errors(argv=[])
+    assert error_code == 0, \
+        f'Found {len(errors)} code style errors / warnings:\n' + \
         '\n'.join(errors)
diff --git a/test/test_mypy.py b/test/test_mypy.py
index 9b896ad..2cb49a3 100644
--- a/test/test_mypy.py
+++ b/test/test_mypy.py
@@ -1,12 +1,14 @@
-from ament_mypy.main import main
 import os
+
 import pytest
+from ament_mypy.main import main
 
 
 @pytest.mark.mypy
 @pytest.mark.linter
 def test_mypy() -> None:
+    """Tests mypy on this module."""
     file_path = __file__.replace(f'{__name__}.py', '')
-    config_file = os.path.join(file_path, '..', 'mypy.ini')
-    rc = main(argv=['--config', config_file])
-    assert rc == 0, 'Found code style errors / warnings'
+    config_file = os.path.join(file_path, '..', '..', '..', '..', 'mypy.ini')
+    error_code = main(argv=['--config', config_file])
+    assert error_code == 0, 'Found code style errors / warnings'
diff --git a/test/test_pep257.py b/test/test_pep257.py
index b6808e1..8e7dfaa 100644
--- a/test/test_pep257.py
+++ b/test/test_pep257.py
@@ -19,5 +19,6 @@
 @pytest.mark.linter
 @pytest.mark.pep257
 def test_pep257() -> None:
-    rc = main(argv=['.', 'test'])
-    assert rc == 0, 'Found code style errors / warnings'
+    """Tests pep257 on this module."""
+    error_code = main(argv=['.', 'test'])
+    assert error_code == 0, 'Found code style errors / warnings'