Dynamic test generation (just because I keep forgeting how to do it).

dyntest.py

import unittest


class TestAutogenerated(unittest.TestCase):
    values = [('a', 1), ('be', 20), ('cal', 3), ('dado', 2)]

    @staticmethod
    def make_test(s, n):
        def new_test(self):
            self.assertEqual(len(s), n)
        return new_test

    @classmethod
    def add_tests(cls):
        for v in cls.values:
            setattr(cls, 'test_{}'.format(v[0]), cls.make_test(*v))


TestAutogenerated.add_tests()


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