Define a pytest fixture providing multiple arguments to test function

Question

With pytest, I can define a fixture like so:

@pytest.fixture
def foo():
    return \"blah\"

And use it in a test like so:

d         


        

Answer 1

You can now do this using pytest-cases:

from pytest_cases import fixture

@fixture(unpack_into="foo,bar")
def foobar():
    return "blah", "whatever"

def test_stuff(foo, bar):
    assert foo == "blah" and bar == "whatever"

See the documentation for more details (I'm the author by the way)

Answer 2

note: this solution not working if your fixture depends on another fixtures with parameters

Don't really know if there are any default solution in pytest package, but you can make a custom one:

import pytest
from _pytest.mark import MarkInfo


def pytest_generate_tests(metafunc):
    test_func = metafunc.function
    if 'use_multifixture' in [name for name, ob in vars(test_func).items() if isinstance(ob, MarkInfo)]:
        result, func = test_func.use_multifixture.args
        params_names = result.split(',')
        params_values = list(func())
        metafunc.parametrize(params_names, [params_values])


def foobar():
    return "blah", "whatever"


@pytest.mark.use_multifixture("foo,bar", foobar)
def test_stuff(foo, bar):
    assert foo == "blah" and bar == "whatever"


def test_stuff2():
    assert 'blah' == "blah"

So we defined pytest_generate_tests metafunction. This function

1. checks if multifixture mark is on the test

2. if the mark is on - it takes variables names "foo,bar" and fucntion foobar that will be executed on generation

   @pytest.mark.multifixture("foo,bar", foobar)