path: root/data_structures_and_algorithms/find-unique-int-among-duplicates.py

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)