A simple demonstration with regards to autospeccing caveat.

missing_attribute.py

import unittest
from unittest.mock import patch


class MyDummyClass:

    def __init__(self):
        self.my_dummy_attribute = "yey!"

    def test_dummy_function(self):
        return "hello"


class TestAutoSpec(unittest.TestCase):

    @patch('test_func.MyDummyClass', autospec=True)
    def test_autospec_function(self, mock_dummy_class):
        self.assertTrue(hasattr(mock_dummy_class, "test_dummy_function"))

    @patch('test_func.MyDummyClass', autospec=True)
    def test_autospec_attribute(self, mock_dummy_class):
        self.assertTrue(hasattr(mock_dummy_class, "test_dummy_attribute"))