def test_mult_single_digits(self):
"""Does single digit multiplication work?"""
product = mult([4], [5])
self.assertEqual(product, [2, 0])
def test_mult_4x4_digits(self):
product = mult([8, 9, 1, 2], [9, 8, 3, 1])
self.assertEqual(product, [8, 7, 6, 1, 3, 8, 7, 2])
def test_mult_9x9_digits(self):
product = mult([4, 5, 6, 0, 0, 0, 0, 0, 0],
[4, 5, 6, 0, 0, 0, 0, 0, 0])
self.assertEqual(
product, [2, 0, 7, 9, 3, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
def test_mult_3x3_with_carry_digits(self):
product = mult([1, 0, 1], [1, 2, 9])
self.assertEqual(product, [1, 3, 0, 2, 9])
def test_mult_2x2_with_carry_digits(self):
product = mult([8, 9], [6, 7])
self.assertEqual(product, [5, 9, 6, 3])
def test_mult_2x2_digits(self):
product = mult([1, 2], [3, 1])
self.assertEqual(product, [3, 7, 2])
def test_mult_1x2_digits(self):
product = mult([4], [1, 0])
self.assertEqual(product, [4, 0])
product = mult([4, 5], [8])
self.assertEqual(product, [3, 6, 0])
def test_mult_null_string_against_single_digit(self):
"""Does single digit multiplication work with one digit None?"""
product = mult([], [5])
self.assertEqual(product, None)