import unittest

def jokempo(x, y):
    if (x, y) == ("pedra", "tesoura"):
        return "pedra"
    elif (x, y) == ("tesoura", "pedra"):
        return "pedra"
    elif (x, y) == ("tesoura", "papel"):
        return x
    elif (x, y) == ("papel", "tesoura"):
        return "tesoura"
    elif (x, y) == ("pedra", "papel"):
        return "papel"
    elif (x, y) == ("papel", "pedra"):
        return "papel"


class TestCase(unittest.TestCase):

    def teste_pedra_tesoura (self):
        self.assertEquals(jokempo("pedra", "tesoura"), "pedra")

    def teste_tesoura_pedra (self):
        self.assertEquals(jokempo("tesoura", "pedra"), "pedra")

    def teste_papel_tesoura (self):
        self.assertEquals(jokempo("papel", "tesoura"), "tesoura")

    def teste_tesoura_papel (self):
        self.assertEquals(jokempo("tesoura", "papel"), "tesoura")

    def teste_papel_pedra (self):
        self.assertEquals(jokempo("papel", "pedra"), "papel")