Poetry and pytest are relatively new to me and I am seeking to understand a specific behavior.
I have created a project with poetry, and I have added pytest as a dependy with poetry add --group dev pytest. As a result, here are the relevant line from pyproject.toml:
[tool.poetry.dependencies]
python = "^3.10"
[tool.poetry.group.dev.dependencies]
pytest = "^7.2.0"
Here is the project/modules structure:
.
├── app
│ ├── core
│ │ ├── cli.py
│ │ └── __init__.py
│ ├── __init__.py
│ └── run.py
├── poetry.lock
├── pyproject.toml
├── README.md
└── tests
└── test_cli.py
In test_cli.py I am importing the cli module with from app.core.cli import *
With this particular setup, running poetry run pytest fails with:
tests/test_cli.py:2: in <module>
from app.core.cli import *
E ModuleNotFoundError: No module named 'app'
However, if I invoke a poetry shell and run python3 -m pytest tests/ it works.
It also works if I create an __init__.py in the tests/ directory.
I have seen a similar issue described here but I do not understand how it was resolved. One the suggestions to include include the project root name in the import statement did not help.
I also tried this answer, but it also did not work.
I was under the impression that an __init__.py is not necessary in tests/ and that poetry run pytest should work without it.
