如何使用Twisted Trial运行doctest？

pip install twisted trial

def add(a, b):
    """
    This function adds two numbers.

    >>> add(2, 3)
    5
    >>> add(-1, 1)
    0
    >>> add(0, 0)
    0
    """
    return a + b

from twisted.trial import unittest
import example

class ExampleTestCase(unittest.TestCase):
    def test_doctests(self):
        import doctest
        failure_count, test_count = doctest.testmod(example)
        self.assertEqual(failure_count, 0, f"{failure_count} doctests failed out of {test_count}")

trial test_example.py

def add(a, b):
    """
    This function adds two numbers.

    >>> add(2, 3)
    5
    >>> add(-1, 1)
    0
    >>> add(0, 0)
    0
    """
    return a + b

from twisted.trial import unittest
import example

class ExampleTestCase(unittest.TestCase):
    def test_doctests(self):
        import doctest
        failure_count, test_count = doctest.testmod(example)
        self.assertEqual(failure_count, 0, f"{failure_count} doctests failed out of {test_count}")

trial test_example.py

test_example
  ExampleTestCase
    test_doctests ... ok

----------------------------------------------------------------------
Ran 1 test in 0.001s

OK