"""
Test for -> Factorial.
Created by Egor Kostan.
GitHub: https://github.com/ikostan
"""
# FUNDAMENTALS ALGORITHMS NUMBERS
import unittest
import allure
from parameterized import parameterized
from utils.log_func import print_log
from kyu_7.factorial.factorial import factorial
[docs]
@allure.epic('7 kyu')
@allure.parent_suite('Beginner')
@allure.suite("Algorithms")
@allure.sub_suite("Unit Tests")
@allure.feature("Addition")
@allure.story('Sum of Numbers')
@allure.tag('FUNDAMENTALS',
'ALGORITHMS',
'NUMBERS')
@allure.link(
url='https://www.codewars.com/kata/54ff0d1f355cfd20e60001fc',
name='Source/Kata')
class FactorialTestCase(unittest.TestCase):
"""Testing 'factorial' function."""
@parameterized.expand([
(0, 1, "factorial for 0 is 1"),
(1, 1, "factorial for 1 is 1"),
(2, 2, "factorial for 2 is 2"),
(3, 6, "factorial for 3 is 6")])
def test_factorial(self, n, expected, msg):
"""
Testing 'factorial' function.
In mathematics, the factorial of a non-negative integer n,
denoted by n!, is the product of all positive integers less
than or equal to n. For example: 5! = 5 * 4 * 3 * 2 * 1 = 120.
By convention the value of 0! is 1.
Write a function to calculate factorial for a given input.
If input is below 0 or above 12 throw an exception of type
ValueError (Python).
:return:
"""
# pylint: disable-msg=R0801
allure.dynamic.title("Testing 'factorial' function")
allure.dynamic.severity(allure.severity_level.NORMAL)
allure.dynamic.description_html(
'<h3>Codewars badge:</h3>'
'<img src="https://www.codewars.com/users/myFirstCode'
'/badges/large">'
'<h3>Test Description:</h3>'
"<p></p>")
# pylint: enable-msg=R0801
with allure.step(f"Enter a number n: {n} "
f"and verify the expected output: {expected}."):
print_log(n=n, expected=expected, msg=msg)
self.assertEqual(expected, factorial(n), msg)