def test_should_more_two_equal_numbers(self):
a = "11"
b = "11"
self.assertEquals("110", sum_bin(a, b))
def test_should_sum_simple_numbers(self):
a = "100"
b = "101"
self.assertEquals("1001", sum_bin(a, b))
def test_should_more_complex_numbers(self):
a = "1111"
b = "0011"
self.assertEquals("10010", sum_bin(a, b))
