pytest can't find module for tests

Question

I have a structure like (not exact names)

 - my_project
   - app
     - repo
       - __init__.py
       - my_repo.py
     - services
       - __init__.py
       - my_service.py
     - utils
       - __init__.py
     - __init__.py
     - main.py
   - __init__.py
   - test_main.py

Previously I had a flat structure and my tests worked, now that I changed to this structure, every time I try to run pytest, I get the following error:

portError while importing test module '/Users/user/IdeaProjects/my-project/test_main.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/Cellar/[email protected]/3.9.12/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test_main.py:3: in <module>
    from app.main import app
app/main.py:3: in <module>
    from repository.image_repository import ImageRepository
E   ModuleNotFoundError: No module named 'repository'

bear in mind that I can run this project normally without any problems, the problems happen when I try to run the tests.

The import section of my test_main.py file is:

from unittest.mock import patch
from fastapi.testclient import TestClient
from app.main import app
from app.services.image_storage import ImageStorage
from app.repository.image_repository import ImageRepository

and the import section of my main.py file is:

import uvicorn
from fastapi import FastAPI, UploadFile, HTTPException
from repository.image_repository import ImageRepository
from services.image_storage import ImageStorage
from utils import generate_filename, is_image

app = FastAPI()
image_repository = ImageRepository()
image_storage = ImageStorage()