[Python] Unittest can't find imported module in imported module

Unittest modules import issue

My project folder structure goes like this:

project/
__init__.py (empty)
tests/
__init__.py (empty)
tests.py
src/
__init__.py
a.py
b.py
c.py


tests/tests.py

import unittest
from a import A

my_a = A()
class TestClass(unittest.TestCase):
# Some tests
pass


src/init.py

__all__ = ["a", "b", "c"]


src/a.py

from b import B


src/b.py

from c import C


src/c.py

pass


Everything works fine when I run the code from the command line but testing it throws this error: ModuleNotFoundError: No module named 'b'

I did lots of research that I could condensed to these links:

• Python unittest failing to resolve import statements
• Running unittest with typical test directory structure
• How do I write good/correct package __init__.py files
• https://docs.python.org/3/tutorial/modules.html#packages

Right now I'm really confused about how __init__.py would work in this case and why my test can't find imported modules path. Can anyone lend me a hand with this please?

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