def test_factorial_returns_correct_value_for_an_integer(self):
math_object = MathFunctions.MathFunction()
self.assertEqual(1, math_object.factorial(1))
self.assertEqual(2, math_object.factorial(2))
self.assertEqual(120, math_object.factorial(5))
self.assertEqual(3628800, math_object.factorial(10))
self.assertEqual(1, math_object.factorial(0))
def find_permutations(self, string):
math_object = MathFunctions.MathFunction()
array_permutations = []
len_of_string = len(string)
if len_of_string >= 3:
for char_start in string:
end_string = string.replace(char_start, "")
end_string_permutations = self.find_permutations(end_string)
for i in range(0, math_object.factorial(len(end_string))):
array_permutations.append(char_start +
end_string_permutations[i])
if len_of_string == 2:
array_permutations.append(string[0] + string[1])
array_permutations.append(string[1] + string[0])
if len_of_string == 1:
array_permutations.append(string)
return sorted(array_permutations)
def test_sum_of_individual_digits_for_an_integer_is_correct_value(self):
math_object = MathFunctions.MathFunction()
self.assertEqual(9, math_object.add_each_digit(540))
self.assertEqual(27, math_object.add_each_digit(3628800))
