test_constants.py

import unittest
import constants as C


class TestConstants(unittest.TestCase):

    def test_unique_constants(self):
        constants_dict = {name: value for name, value in vars(
            C).items() if isinstance(value, str)}
        values = list(constants_dict.values())
        unique_values = set(values)

        if len(values) != len(unique_values):
            # Find non-unique values
            duplicates = set(
                [value for value in values if values.count(value) > 1])
            non_unique_constants = {
                name: value for name, value in constants_dict.items() if value in duplicates}
            self.fail(
                f"String constants are not unique: {non_unique_constants}")

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