module not found issue with pytest

Question

I have a folder structure like this

- functions
 - func1
   - file.py
   - app.py
   - file1.py
 - func2
- tests
 - test1.py

I am calling app.py inside test1.py

def test_file_case():
    from functions.func1.app import some_func

and app.py imports file and file1 which throws error when I run pytest -s test1.py or python -m pytest test1.py

from file import *
from file1 import *
def some_func():
  somecode..

any suggestions what could be done to resolve the issue and I have __init__.py files in all the directories.