[Python] Python unittest fails with No module loaded in VScode

I have the following directory structure



when I use the test runner I get

File "/home/kyle/dev/tests/test_foo.py", line 2, in <module> import foo ModuleNotFoundError: No module named 'foo'

I'm at a loss as what could be wrong. The test code looks like:

import unittest
import foo

class TestStringMethods(unittest.TestCase):

def test_upper(self):
self.assertEqual(foo.f(), 'FOO3')

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



I'm using a virtual environment (.venv) I've set that to my interpreter.

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