61 lines
1.4 KiB
Python
61 lines
1.4 KiB
Python
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"""
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Ejemplo de implementacion de test y pruebas de la funcion factorial
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factorial(0) = 1
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factorial(1) = 1
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factorial(2) = 2
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factorial(3) = 6
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factorial(4) = 24
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factorial(5) = 120
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n! = n*(n-1)*(n-2)*...*1
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"""
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import unittest
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class ErrorValorNegativo(Exception):
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pass
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# Esta función se puede definir de forma recursiva o iterativa
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# Para este caso se define usando recursión.
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def factorial(n):
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if n < 0:
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raise ErrorValorNegativo("Número Negativo")
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elif n == 0:
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return 1
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elif n == 1:
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return 1
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else:
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return n * factorial(n - 1)
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class FactoriaTestCase(unittest.TestCase):
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def test_factorial_numero_negativo(self):
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self.assertRaises(ErrorValorNegativo, factorial, -1)
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def test_factorial_0(self):
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self.assertEqual(1, factorial(0))
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def test_factorial_1(self):
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self.assertEqual(1, factorial(1))
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def test_factorial_2(self):
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self.assertEqual(2, factorial(2))
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def test_factorial_3(self):
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self.assertEqual(6, factorial(3))
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def test_factorial_4(self):
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self.assertEqual(24, factorial(4))
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def test_factorial_5(self):
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self.assertEqual(120, factorial(5))
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def test_factorial_6(self):
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self.assertEqual(720, factorial(6))
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if __name__ == '__main__':
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unittest.main()
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#for i in range(10):
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# print(factorial(i))
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