def testSeNaoExisteSimboloNoIndiceInformadoRetornaNone(self):
p = Producao('B', 'a <ABACATE> N b')
self.assertEqual(None, p.obterSimboloBeta(4))
def testDadoUmIndiceSabeDizerQualSimboloSeEncontraNaquelaPosicaoNoBetaDaProducao(self):
p = Producao('B', 'a <ABACATE> N b')
self.assertEqual('a', p.obterSimboloBeta(0))
self.assertEqual('<ABACATE>', p.obterSimboloBeta(1))
self.assertEqual('N', p.obterSimboloBeta(2))
self.assertEqual('b', p.obterSimboloBeta(3))
