def test_addDigitCorrectlyGoesFrom0To3To30To309(self):
num = Number()
num.add_digit(3)
self.assertEqual(num.value, 3)
num.add_digit(0)
self.assertEqual(num.value, 30)
num.add_digit(9)
self.assertEqual(num.value, 309)
def test_addDigitCorrectlyGoesFrom0To4(self):
num = Number()
num.add_digit(4)
self.assertEqual(num.value, 4)
def test_NumberStartsAtZero(self):
num = Number()
self.assertEqual(num.value, 0)
def test_removeDigitGoesFrom309To30To3To0(self):
num = Number()
num.add_digit(3)
self.assertEqual(num.value, 3)
num.add_digit(0)
self.assertEqual(num.value, 30)
num.add_digit(9)
self.assertEqual(num.value, 309)
num.remove_digit()
self.assertEqual(num.value, 30)
num.remove_digit()
self.assertEqual(num.value, 3)
num.remove_digit()
self.assertEqual(num.value, 0)
def test_addDigitThrowsExceptionWhenGivenToSmallAnInteger(self):
num = Number()
with self.assertRaises(DigitOutOfRangeException):
num.add_digit(-1)
def test_addDigitDoesNotChangeWhenGiven0AsTheFirstDigit(self):
num = Number()
num.add_digit(0)
self.assertEqual(num.value, 0)
def test_addDigitCorrectlyGoesFrom0To3To36(self):
num = Number()
num.add_digit(3)
num.add_digit(6)
self.assertEqual(num.value, 36)