[Python] python unittest own folder relative import ubuntu

There are similar questions but none of them have a completly sibling test folder with main.py in the src folder and none of them work. Currently I use the following approach

#project/tests/aaa/bbb/test_foo.py
import unittest
import sys
sys.path.append("....")
from src.aaa.bbb import foo as foo
#...


and end up with a

ModuleNotFoundError: No module named 'src'


(I tested profoundly if the amount of points in sys.path.append("....") is correct) Maybe I do not understand python but my folder structures (which I would like to keep) goes:

/project
/src
main.py
/aaa
/bbb
foo.py
/tests
/aaa
/bbb
test_foo.py


I execute it in the project folder and for the normal not-test files that works fine.

A former Try was (in test_foo.py):

from ....src.aaa.bbb import foo as foo


This is the approach that works in the normal files but for the test files I got:

ImportError: attempted relative import with no known parent package
``
I tried it with and without the ``` -m``` option.
Also with and without


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

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