diff --git a/tests/benchmark_plot.py b/tests/benchmark_plot.py
index 7aa8404..9f0258f 100644
--- a/tests/benchmark_plot.py
+++ b/tests/benchmark_plot.py
@@ -21,7 +21,6 @@
 
 """
 
-
 import argparse
 import matplotlib
 import matplotlib.pyplot as plt
diff --git a/tests/benchmark_splits_fill.py b/tests/benchmark_splits_fill.py
index 8945087..a5e992e 100644
--- a/tests/benchmark_splits_fill.py
+++ b/tests/benchmark_splits_fill.py
@@ -57,7 +57,6 @@
 
 """
 
-
 import sortedcontainers as sc
 import random
 
diff --git a/tests/plot_lengths_histogram_add.py b/tests/plot_lengths_histogram_add.py
index a3917b6..c5842be 100644
--- a/tests/plot_lengths_histogram_add.py
+++ b/tests/plot_lengths_histogram_add.py
@@ -27,7 +27,6 @@
 
 """
 
-
 import argparse
 import itertools as it
 import numpy as np
diff --git a/tests/plot_lengths_histogram_delitem.py b/tests/plot_lengths_histogram_delitem.py
index ae14240..8e4c3c1 100644
--- a/tests/plot_lengths_histogram_delitem.py
+++ b/tests/plot_lengths_histogram_delitem.py
@@ -1,7 +1,4 @@
-"""Plot histogram of SortedList sublist lengths while items are deleted.
-
-"""
-
+"""Plot histogram of SortedList sublist lengths while items are deleted."""
 
 import argparse
 import itertools as it