def test_calc_1(self):
calc = calculo()
calc.ingresar('1')
calc.ingresar('+')
calc.ingresar('2')
calc.ingresar('=')
self.assertEqual(calc.display(), '3')
def test_calc_3(self):
calc = calculo()
calc.ingresar('2')
calc.ingresar('*')
calc.ingresar('3')
calc.ingresar('=')
self.assertEqual(calc.display(), '6')
def test_calc_2(self):
calc = calculo()
calc.ingresar('1')
calc.ingresar('-')
calc.ingresar('1')
calc.ingresar('=')
self.assertEqual(calc.display(), '0')
def test_calc_4(self):
calc = calculo()
calc.ingresar('1')
calc.ingresar('5')
calc.ingresar('/')
calc.ingresar('3')
calc.ingresar('=')
self.assertEqual(calc.display(), '5.0')