Encontrar enésimo número de Fibonnaci

test_fibonnaci.py

import unittest

def fibonnaci(numero):
    """
    Autor: fzmaster
    Data: 22/12/2010
    Problema: Fibonnaci Killer
              http://codingkata.org/katas/unit/fibonacci-killer

    Calcular enesimo numero de Fibonnaci
    """
    if numero == 0:
        return 0
    elif numero == 1:
        return 1
    else:
        return fibonnaci(numero-1)+fibonnaci(numero - 2)


class FKTestCase(unittest.TestCase):

    def test_FB0(self):
        assert fibonnaci(0) == 0
    def test_FB1(self):
        assert fibonnaci(1) == 1
    def test_FB2(self):
        assert fibonnaci(2) == 1
    def test_FB3(self):
        assert fibonnaci(3) == 2
    def test_FB16(self):
        assert fibonnaci(16) == 987

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