import unittest

from .deterministic_set import DeterministicSet

import random

class DeterministicSetTest(unittest.TestCase):

def test_empty_depset_can_be_created(self):

self.assertIsNotNone(DeterministicSet())

def test_depset_iteration_order_is_sorted(self):

# depset contract does not state that the order is sorted, but

# currently the easiest way to implement determinism is to sort

random_elements = [random.shuffle(range(99))]

self.assertEqual(list(DeterministicSet(random_elements)), sorted(random_elements))

def test_depset_to_list_converts_it_to_list(self):

self.assertEqual([1, 2, 3], DeterministicSet([1, 2, 3]).to_list())

def test_plus_operator_can_union_depsets(self):

self.assertEqual(DeterministicSet([1, 2]), DeterministicSet([1]) + DeterministicSet([2]))

if __name__ == '__main__':

unittest.main()