pytest: Parametrize fixtures with multiple items from addoption/commandline

README.md

py.test parametrize fixtures by addoption

run

pytest test_parametrize.py --database A --database=B --verbose

========== test session starts ===========
platform linux -- Python 3.6.2, pytest-3.2.2, py-1.4.34, pluggy-0.4.0 -- /tmp/envs/py3/bin/python
cachedir: .cache
rootdir: /tmp/test, inifile:
plugins: logger-0.2.1
collected 2 items                                                                 

test_backend.py::test_db_initialized[A] PASSED
test_backend.py::test_db_initialized[B] PASSED

======== 2 passed in 0.01 seconds ========

conftest.py

import pytest


def pytest_addoption(parser):
    parser.addoption("--database", action="append", default=[], help="Choice of database")


def pytest_generate_tests(metafunc):
    if 'database' in metafunc.fixturenames:
        databases = list(metafunc.config.option.database)
        metafunc.parametrize('database', databases, indirect=True)


class DatabaseA(object):
    name = 'Database A'


class DatabaseB(object):
    name = 'Database B'


@pytest.fixture
def database(request):
    if request.param == "A":
        return DatabaseA()
    elif request.param == "B":
        return DatabaseB()

test_parametrize.py

import pytest


def test_parametrize(database):
    if database.__class__.__name__ == 'DatabaseA':
        assert database.name == "Database A"
    else:
        assert database.name == "Database B"