[Python] Can't import my own module in my test file

I have the following project structure :

.
├── README.md
├── document_processing
│ ├── Config.py
│ ├── DocumentParser.py
│ ├── FileChecker.py
│ └── __init__.py
├── indexing.py
└── tests
├── CheckFileTest.py
└── __init__.py


In CheckFileTest.py, I have implemented some tests for the FileChecker.py functions.

import unittest
from document_processing.Config import Config
from document_processing.FileChecker import FileChecker

class CheckFileTest(unittest.TestCase):
def __init__(self):
self.config = Config()
self.fc = FileChecker(self.config)

def test_not_empty_line(self):
...

def test_line_format(self):
...

if __name__ == "__main__":
unittest.main()


Unfortunately, I got this error when I run the test file (launched from the project root) :

Traceback (most recent call last):
File "/Users/thomaslaurent/Dev/MIRCV_project/tests/CheckFileTest.py", line 3, in <module>
from document_processing.Config import Config
ModuleNotFoundError: No module named 'document_processing


I have seen many things on that, but I can't figure out what's blocked with this structure.

With relative import :

from ..document_processing.Config import Config


I got this error :

ImportError: attempted relative import with no known parent package


EDIT

Following the comments of @sinoroc, I don't make my tests a package and I have created a setup.py file :

from setuptools import setup

setup(
name="MIRCV_project",
version="1.0",
description="",
author="Thomas LAURENT",
author_email="",
packages=["document_processing"],
install_requires=[], # external packages acting as dependencies
)


And I finally run :

python -m pip install --editable .


You can vote for a previous answer of @sinoroc on setup.py configuration : How to make setup.py for standalone application

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