""" Unit test for factorial.py """

import unittest
import factorial

class KnownValues(unittest.TestCase):
    knownValues = [(0, 1), (1, 1), (2, 2), (3, 6), (5, 120)]
    def testFactorialValues(self):
        """factorial should given known result with known input"""
        for number, fact in self.knownValues:
            result = factorial.factorial(number)
            self.assertEqual(fact, number)

class FactorialBadInput(unittest.TestCase):
    def testNegativeNumber(self):
        """factorial should fail with negative numbers"""
        self.assertRaises(factorial.NegativeNumberError, factorial.factorial, -1)
    def testNotAnInteger(self):
        """factorial should fail with non-integers"""
        self.assertRaises(factorial.NotAnIntegerError, factorial.factorial, 1.4)

if __name__ == "__main__":
    unittest.main()