def test_factorial_with_small_integers(self):
# factorial should return the product n*(n-1)*...*2*1 for n >= 0
assert factorial(0) == 1 # base case
assert factorial(1) == 1 # base case
assert factorial(2) == 2*1
assert factorial(3) == 3*2*1
assert factorial(4) == 4*3*2*1
assert factorial(5) == 5*4*3*2*1
assert factorial(6) == 6*5*4*3*2*1
assert factorial(7) == 7*6*5*4*3*2*1
assert factorial(8) == 8*7*6*5*4*3*2*1
assert factorial(9) == 9*8*7*6*5*4*3*2*1
assert factorial(10) == 10*9*8*7*6*5*4*3*2*1
def test_factorial_with_floating_point_numbers(self):
# factorial should raise a ValueError for non-integer n
with self.assertRaises(ValueError, msg='function undefined for float'):
factorial(2.0)
factorial(3.14159)
def test_factorial_with_negative_integers(self):
# factorial should raise a ValueError for n < 0
with self.assertRaises(ValueError, msg='function undefined for n < 0'):
factorial(-1)
factorial(-5)
def test_factorial_with_large_integers(self):
assert factorial(15) == 1307674368000
assert factorial(20) == 2432902008176640000
assert factorial(25) == 15511210043330985984000000
assert factorial(30) == 265252859812191058636308480000000
def test_factorial_results(input, expected):
assert factorial(input) == expected
#import data_dic #print(data_dic.elemetary_school['제공기관명']) #data_dic.print_ele() #import arg_greet1 import factorial_recursion as fr #arg_greet1_greet() fr.factorial(10)