import unittest
from utils.string_utils import capitalize_first_letter, reverse_string


class TestStringUtils(unittest.TestCase):
    def test_capitalize_first_letter(self):
        self.assertEqual(capitalize_first_letter('hello'), 'Hello')
        self.assertEqual(capitalize_first_letter(''), '')

    def test_reverse_string(self):
        self.assertEqual(reverse_string('hello'), 'olleh')


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