[Python] How to resolve incompatible imports in python and pytest

I have created a project exactly as described by the pytest Good Integration Practices documentation, specifically the Tests outside application code section.

This is my project layout

.
├── pyproject.toml
├── src
│ └── basic_package
│ ├── bar.py
│ ├── __init__.py
│ └── main.py
└── tests
└── test_app.py



In main.py I import from bar.py

from bar import baz

def main() -> str:
return baz()


in test_app.py

from basic_package.main import main

def test_foo():
assert main() == 'qux'


It works when I run the project. However, if I run pytest, I get an error

ModuleNotFoundError: No module named 'bar'
​

It works in pytest if I change the code in main.py to

from .bar import baz


But then if I run the application I get the ModuleNotFoundError

How can I resolve this issue?

I am running pytest from the root directory of the project

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