diff --git a/tests/test_postprocess_math_documentation.py b/tests/test_postprocess_math_documentation.py
index d8be8a5d..fb2558de 100644
--- a/tests/test_postprocess_math_documentation.py
+++ b/tests/test_postprocess_math_documentation.py
@@ -1,6 +1,7 @@
 from pathlib import Path
 
 import pytest
+
 from calliope.postprocess.math_documentation import MathDocumentation
 
 from .common.util import build_test_model, check_error_or_warning