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path: root/universe/data_structures_and_algorithms/recursive-string-permutations.py
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import unittest


################################################################################
# Implementation
################################################################################
# get_permutations :: String -> Set(String)
def get_permutations(string):
    pass


################################################################################
# Tests
################################################################################
class Test(unittest.TestCase):
    def test_empty_string(self):
        actual = get_permutations('')
        expected = set([''])
        self.assertEqual(actual, expected)

    def test_one_character_string(self):
        actual = get_permutations('a')
        expected = set(['a'])
        self.assertEqual(actual, expected)

    def test_two_character_string(self):
        actual = get_permutations('ab')
        expected = set(['ab', 'ba'])
        self.assertEqual(actual, expected)

    def test_three_character_string(self):
        actual = get_permutations('abc')
        expected = set(['abc', 'acb', 'bac', 'bca', 'cab', 'cba'])
        self.assertEqual(actual, expected)


unittest.main(verbosity=2)