Environment data

• VS Code version: 1.60.0 (user setup) (Commit: e7d7e9a9348e6a8cc8c03f877d39cb72e5dfb1ff)
• Extension version (available under the Extensions sidebar): v2021.9.1191016588
• OS and version: Windows_NT x64 10.0.19042
• Python version (& distribution if applicable, e.g. Anaconda): 3.9.7
• Type of virtual environment used N/A
• Value of the python.languageServer setting: Pylance

Expected behaviour

When you run the tests from the Testing side bar in the extension, tests run properly when you have unittest.main() in a file.

Actual behaviour

Unittest Discovery Error [Folder Name]
Error discovering unittest tests (see Output > Python):

(with nothing in Output > Python).

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. Create a new folder, and create add.py and test.py
2. In add.py put:

def add(a, b):
    return a + b

3. In tests.py put:

import unittest
from add import add

class TestAdd(unitest.TestCase):
    def test_one_plus_one(self):
        self.assertEqual(2, add(1, 1))

4. Using Testing on the sidebar select Set-up python tests > unittest > . > test*.py
5. Run the tests, tests work normally ✅
6. Add unitest.main() to the bottom of test.py.
7. Run test.py with python test.py: tests work normally ✅
8. Try running tests with the Testing side bar: tests do not work, and you get the error described above ❌

Logs

None