How to load environment variables from file using python-dotenv before loading pytest scritps?

Question

I have tests which on inside docker container with https://github.com/pytest-docker-compose/pytest-docker-compose, but it does take too long for the container to start up/shutdown. Then, I would like to let docker-compose run tests only CI machine or when need.

For this, I used this way of defining tests on simple_test_runner.py:

import os

THIS_FOLDER = os.path.dirname(os.path.realpath(__file__))
RUN_TESTS_LOCALLY = os.environ.get('RUN_TESTS_LOCALLY')

if RUN_TESTS_LOCALLY:
    def test_simple(run_process, load_env):
        output, returncode = run_process("python3 " + THIS_FOLDER + "/simple_test.py")
        assert returncode == 0

else:
    def test_simple(function_scoped_container_getter):
        container = function_scoped_container_getter.get("container_name")
        exec = container.create_exec("python3 /simple_test.py")
        ...

This works file if I export RUN_TESTS_LOCALLY=1 before calling pytest -vs ., but if I try to use https://github.com/theskumar/python-dotenv in my conftest.py:

from dotenv import load_dotenv

@pytest.fixture(scope='session', autouse=True)
def load_env():
    print("Loading .env file")
    load_dotenv()

The environment variables are only loaded after python test loaded the simple_test_runner.py. Then, my tests are always running inside docker instead of outside it when RUN_TESTS_LOCALLY=1 is defined.

How can I make pytest to call load_dotenv() before my switch if RUN_TESTS_LOCALLY: is evaluated inside my tests?

Or do you know an alternative to if RUN_TESTS_LOCALLY: which allows me to use load_dotenv() and switch between running my tests inside docker-compose or not?

Evandro Coan · Accepted Answer · 2021-09-25 18:35:22Z

0

The code I originally posted is working:

@pytest.fixture(scope='session', autouse=True)
def load_env(request):
    file = THIS_FOLDER + '/.env'
    if request.config.getoption("verbose") > 0:
        print("Loading", file, file=sys.stderr)
    load_dotenv(dotenv_path=file)

The problem was that when I had tested, I had set my environment variable to RUN_TESTS_LOCALLY= (the empty string). This was causing dotenv to not override my environment variable. Once I unset the variable with bash unset RUN_TESTS_LOCALLY, dotenv was finally loading the environment file correctly.

answered Sep 25, 2021 at 18:35

Evandro Coan

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