Python3 - Pytest directory structure and imports

I have the following project files (using Python3):

pyproj
├── __init__.py
├── main.py
├── module1.py
├── module2.py
└── tests
    ├── __init__.py
    └── test_module.py

module1 contains no imports.

module2 imports from module 1 as follows:

import module1

main.py imports from module1 and module2 as follows:

from module1 import *
from module2 import *

I would like tests/test_module to be able to import from module2 and from module1, and to be able to run it using pytest from the pyproj directory. However attempting to import module2 using:

 from ..module2 import *

causes the following error when running pytest from either the pyproj directory or the tests directory:

tests/test_module.py:1: in <module> from ..module2 import * module2.py:1: in <module> import module1 E ImportError: No module named 'module1'

The problem seems to be when module1 is importing module2. python3 main.py runs correctly however.

I've tried numerous changes, but none seem to allow both main.py and the tests to work correctly. What is the correct way to structure the project and appropriately import files to do this?