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import unittest
################################################################################
# Solution
################################################################################
def find_unique_delivery_id(xs):
a = 0
for x in xs:
a ^= x
return a
################################################################################
# Tests
################################################################################
class Test(unittest.TestCase):
def test_one_drone(self):
actual = find_unique_delivery_id([1])
expected = 1
self.assertEqual(actual, expected)
def test_unique_id_comes_first(self):
actual = find_unique_delivery_id([1, 2, 2])
expected = 1
self.assertEqual(actual, expected)
def test_unique_id_comes_last(self):
actual = find_unique_delivery_id([3, 3, 2, 2, 1])
expected = 1
self.assertEqual(actual, expected)
def test_unique_id_in_middle(self):
actual = find_unique_delivery_id([3, 2, 1, 2, 3])
expected = 1
self.assertEqual(actual, expected)
def test_many_drones(self):
actual = find_unique_delivery_id(
[2, 5, 4, 8, 6, 3, 1, 4, 2, 3, 6, 5, 1])
expected = 8
self.assertEqual(actual, expected)
unittest.main(verbosity=2)
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