import unittest


def range_parser(ranges):
    numbers = ranges.split(',')

    result = []
    for n in numbers:
        if n.isdigit():
            add_number_to_list(n, result)
        else:
            add_range_to_list(n, result)

    return result


def add_range_to_list(input_range, result):
    end, start, step = format_range(input_range)

    numbers = range(int(start), int(end) + 1, int(step))
    for n in numbers:
        add_number_to_list(n, result)


def format_range(input_range):
    step = 1
    start, end = input_range.split('-')

    if ':' in end:
        end, step = end.split(':')

    return end, start, step


def add_number_to_list(number, numbers):
    numbers.append(int(number))


class RangeParser(unittest.TestCase):
    def test_single_number(self):
        result = range_parser("2")

        expected = [2]
        self.assertEqual(expected, result)

    def test_multiple_numbers(self):
        result = range_parser("2,3,5")

        expected = [2, 3, 5]
        self.assertEqual(expected, result)

    def test_single_range(self):
        result = range_parser("2-5")

        expected = [2, 3, 4, 5]
        self.assertEqual(expected, result)

    def test_multiple_range(self):
        result = range_parser("2-5, 7-11")

        expected = [2, 3, 4, 5, 7, 8, 9, 10, 11]
        self.assertEqual(expected, result)

    def test_single_range_with_steps(self):
        result = range_parser("2-10:2")

        expected = [2, 4, 6, 8, 10]
        self.assertEqual(expected, result)

    def test_all_cases_together(self):
        result = range_parser("1-10,14, 20-25:2")

        expected = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 20, 22, 24]
        self.assertEqual(expected, result)


if __name__ == '__main__':
    unittest.main()