diff --git a/kyu_6/sum_of_digits_digital_root/__init__.py b/kyu_6/sum_of_digits_digital_root/__init__.py
index e69de29bb2d..f8852e83334 100644
--- a/kyu_6/sum_of_digits_digital_root/__init__.py
+++ b/kyu_6/sum_of_digits_digital_root/__init__.py
@@ -0,0 +1 @@
+"""Sum of Digits / Digital Root."""
diff --git a/kyu_6/sum_of_digits_digital_root/digital_root.py b/kyu_6/sum_of_digits_digital_root/digital_root.py
index f7f06e1c09e..340dddb02cc 100644
--- a/kyu_6/sum_of_digits_digital_root/digital_root.py
+++ b/kyu_6/sum_of_digits_digital_root/digital_root.py
@@ -1,5 +1,6 @@
 """
-Solution for -> Sum of Digits / Digital Root
+Solution for -> Sum of Digits / Digital Root.
+
 Created by Egor Kostan.
 GitHub: https://github.com/ikostan
 """
@@ -14,7 +15,6 @@ def digital_root(n: int) -> int:
     If that value has more than one digit, continue reducing
     in this way until a single-digit number is produced. This
     is only applicable to the natural numbers.
-
     :param n:
     :return:
     """
diff --git a/kyu_6/sum_of_digits_digital_root/test_digital_root.py b/kyu_6/sum_of_digits_digital_root/test_digital_root.py
index 2c99719aec7..104c2b268aa 100644
--- a/kyu_6/sum_of_digits_digital_root/test_digital_root.py
+++ b/kyu_6/sum_of_digits_digital_root/test_digital_root.py
@@ -1,5 +1,6 @@
 """
-Test for -> Sum of Digits / Digital Root
+Test for -> Sum of Digits / Digital Root.
+
 Created by Egor Kostan.
 GitHub: https://github.com/ikostan
 """
@@ -8,6 +9,7 @@
 
 import unittest
 import allure
+from parameterized import parameterized
 from utils.log_func import print_log
 from kyu_6.sum_of_digits_digital_root.digital_root \
     import digital_root
@@ -27,10 +29,15 @@
     url='https://www.codewars.com/kata/541c8630095125aba6000c00',
     name='Source/Kata')
 class DigitalRootTestCase(unittest.TestCase):
-    """
-    Testing digital_root function
-    """
-    def test_digital_root(self):
+    """Testing digital_root function."""
+
+    @parameterized.expand([
+        (16, 7),
+        (456, 6),
+        (942, 6),
+        (132189, 6),
+        (493193, 2)])
+    def test_digital_root(self, n, expected):
         """
         In this kata, you must create a digital root function.
 
@@ -51,14 +58,7 @@ def test_digital_root(self):
             '<h3>Test Description:</h3>'
             "<p></p>")
         # pylint: enable-msg=R0801
-        with allure.step("Enter a number and verify the output"):
-            test_data: tuple = (
-                (16, 7),
-                (456, 6),
-                (942, 6),
-                (132189, 6),
-                (493193, 2))
-
-            for n, expected in test_data:
-                print_log(n=n, expected=expected)
-                self.assertEqual(expected, digital_root(n))
+        with allure.step(f"Enter a number: {n} "
+                         f"and verify the output: {expected}."):
+            print_log(n=n, expected=expected)
+            self.assertEqual(expected, digital_root(n))