diff --git a/tests/__init__.py b/tests/__init__.py
index 6bd8fb4..b185083 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1 @@
-"""Unit tests for the copairs package."""
\ No newline at end of file
+"""Unit tests for the copairs package."""
diff --git a/tests/helpers.py b/tests/helpers.py
index e7aaaf4..57207a5 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -1,4 +1,5 @@
 """Helper functions for testing."""
+
 from itertools import product
 from typing import Dict
 
diff --git a/tests/test_build_rank_multilabel.py b/tests/test_build_rank_multilabel.py
index c2afdf4..210a918 100644
--- a/tests/test_build_rank_multilabel.py
+++ b/tests/test_build_rank_multilabel.py
@@ -1,4 +1,5 @@
 """Test the concatenation of ranges."""
+
 import numpy as np
 
 from copairs.compute import concat_ranges
diff --git a/tests/test_compute.py b/tests/test_compute.py
index 03428c7..dfad755 100644
--- a/tests/test_compute.py
+++ b/tests/test_compute.py
@@ -1,4 +1,5 @@
 """Test pairwise distance calculation functions."""
+
 import numpy as np
 
 from copairs import compute
diff --git a/tests/test_map.py b/tests/test_map.py
index f2e2379..b18ca9e 100644
--- a/tests/test_map.py
+++ b/tests/test_map.py
@@ -1,4 +1,5 @@
 """Tests for (mean) Average Precision calculation."""
+
 import numpy as np
 import pandas as pd
 import pytest
diff --git a/tests/test_map_filter.py b/tests/test_map_filter.py
index 4fdfe1f..c49e6e2 100644
--- a/tests/test_map_filter.py
+++ b/tests/test_map_filter.py
@@ -1,4 +1,5 @@
 """Tests data filtering by query."""
+
 import numpy as np
 import pytest
 
diff --git a/tests/test_matching_any.py b/tests/test_matching_any.py
index 3f18c4f..b949613 100644
--- a/tests/test_matching_any.py
+++ b/tests/test_matching_any.py
@@ -1,4 +1,5 @@
 """Test matching with `any` conditions using simulated data."""
+
 from string import ascii_letters
 
 import numpy as np
diff --git a/tests/test_matching_multilabel.py b/tests/test_matching_multilabel.py
index dd6e308..0ee6538 100644
--- a/tests/test_matching_multilabel.py
+++ b/tests/test_matching_multilabel.py
@@ -1,4 +1,5 @@
 """Tests for the multilabel matching implementation."""
+
 import pandas as pd
 
 from copairs.matching import MatcherMultilabel
diff --git a/tests/test_replicating.py b/tests/test_replicating.py
index 79d5661..db9f157 100644
--- a/tests/test_replicating.py
+++ b/tests/test_replicating.py
@@ -1,4 +1,5 @@
 """Tests for the replicating module."""
+
 from numpy.random import default_rng
 
 from copairs import Matcher