def test_empty_iterable(self): self.assertEqual(hw.not_occur_number_in([]), 1)
def test_big_diff(self): self.assertEqual(hw.not_occur_number_in([1, 20]), 2)
def test_missed_item(self): self.assertEqual(hw.not_occur_number_in([1, 2, 3, 4, 7, 6]), 5)
def test_right_sequence(self): self.assertEqual(hw.not_occur_number_in([1, 2, 3]), 4)
def test_list_of_negatives(self): self.assertEqual(hw.not_occur_number_in([-1, -3]), 1)
def test_len_1_iterable(self): self.assertEqual(hw.not_occur_number_in([2]), 3)