how to configure unit test in vscode for python unittest - python-3.6

Question

I am using Python 3.6 and latest version of vscode.
My folder structure:
/folder
/src
src.py
/tests
src_test.py
src.py:
class Addition:
def __init__(self, a, b):
self.a = a
self.b = b
def run(self):
return self.a + self.b
src_test.py:
import unittest
from ..src.addition import Addition
class TestAddition(unittest.TestCase):
def test_addition(self):
inst = Addition(5, 10)
res = inst.run()
self.assertEqual(res, 16)
if( __name__ == "main"):
unittest.main()
here is my project settings.json:
{
"python.testing.unittestArgs": [
"-v",
"-s",
".",
"-p",
"*_test.py"
],
"python.testing.pytestEnabled": false,
"python.testing.nosetestsEnabled": false,
"python.testing.unittestEnabled": true
}
Then under project root folder:
python3 -m unittest tests/src_test.py
File "/usr/lib/python3.6/unittest/loader.py", line 153, in loadTestsFromName
module = __import__(module_name)
ModuleNotFoundError: No module named 'tests.src_test'

Answer 1

You are missing an __init__.py file under the tests folder, and the import your module needs a tweak.
The __init__.py allows Python to go up in the folder structure and reach the src.py module (another __init__.py under src would be nice, but it is not necessary to make the vscode tests work).
This is a working folder structure:
.
├── src
│ └── src.py
└── tests
├── __init__.py
└── src_test.py
Also, change the line in src.py:
(OLD) from ..src.addition import Addition
(NEW) from src.src import Addition