ModuleNotFoundError with pytest

Question

I want my tests folder separate to my application code. My project structure is like so

myproject/
  myproject/
    myproject.py
    moduleone.py
  tests/
    my         


        

Answer 1

Solution: use the PYTHONPATH env. var

PYTHONPATH=. pytest

As mentioned by @J_H, you need to explicitly add the root directory of your project, since pytest only adds to sys.path directories where test files are (which is why @Mak2006's answer worked.)

---

Good practice: use a Makefile or some other automation tool

If you are lazy and do not want to type that long command all the time, one option is to create a Makefile in your project's root dir with, e.g., the following:

.PHONY: install test

default: test

install:
    pip install --upgrade .

test:
    PYTHONPATH=. pytest

Which allows you to simply run:

make test

or (even shorter)

make

Another common alternative is to use some standard testing tool, such as tox.