diff --git a/divide_and_conquer/tests/test_strassen_matrix_multiplication.py b/divide_and_conquer/tests/test_strassen_matrix_multiplication.py
index 1a6073f8d..240096caa 100644
--- a/divide_and_conquer/tests/test_strassen_matrix_multiplication.py
+++ b/divide_and_conquer/tests/test_strassen_matrix_multiplication.py
@@ -3,19 +3,13 @@ from strassen_matrix_multiplication import split_matrix
 
 
 class TestSplitMatrix(unittest.TestCase):
-
     def test_4x4_matrix(self):
-        matrix = [
-            [4, 3, 2, 4],
-            [2, 3, 1, 1],
-            [6, 5, 4, 3],
-            [8, 4, 1, 6]
-        ]
+        matrix = [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]]
         expected = (
             [[4, 3], [2, 3]],
             [[2, 4], [1, 1]],
             [[6, 5], [8, 4]],
-            [[4, 3], [1, 6]]
+            [[4, 3], [1, 6]],
         )
         self.assertEqual(split_matrix(matrix), expected)
 
@@ -28,31 +22,23 @@ class TestSplitMatrix(unittest.TestCase):
             [4, 3, 2, 4, 4, 3, 2, 4],
             [2, 3, 1, 1, 2, 3, 1, 1],
             [6, 5, 4, 3, 6, 5, 4, 3],
-            [8, 4, 1, 6, 8, 4, 1, 6]
+            [8, 4, 1, 6, 8, 4, 1, 6],
         ]
         expected = (
             [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]],
             [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]],
             [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]],
-            [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]]
+            [[4, 3, 2, 4], [2, 3, 1, 1], [6, 5, 4, 3], [8, 4, 1, 6]],
         )
         self.assertEqual(split_matrix(matrix), expected)
 
     def test_invalid_odd_matrix(self):
-        matrix = [
-            [1, 2, 3],
-            [4, 5, 6],
-            [7, 8, 9]
-        ]
+        matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
         with self.assertRaises(Exception):
             split_matrix(matrix)
 
     def test_invalid_non_square_matrix(self):
-        matrix = [
-            [1, 2, 3, 4],
-            [5, 6, 7, 8],
-            [9, 10, 11, 12]
-        ]
+        matrix = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
         with self.assertRaises(Exception):
             split_matrix(matrix)