Dynamically adding fixture with getfixturevalue and fixturenames behavior #3057
Description
Hello,
I would like to know if there is a pattern to dynamically configure a fixture from another fixture such as it would be available in the fixturenames list.
I tried something like that:
import pytest
@pytest.fixture
def mode_b_only(request):
print 'mode_b_only'
@pytest.fixture
def setup(request):
print 'setup', request.fixturenames
if 'mode_b_only' in request.fixturenames:
pass # do something
@pytest.fixture(scope='function', params=[
'mode_a',
# disabled by default
# 'mode_b',
# 'mode_c',
])
@pytest.mark.early
def two(request):
print 'two'
if request.param == 'mode_b':
request.getfixturevalue('mode_b_only')
return request.param
def test_default(two, setup):
pass
@pytest.mark.parametrize('two', ['mode_a', 'mode_b'], indirect=True)
def test_a_and_b(two, setup):
passUnfortunately, setup doesn't see mode_b_only fixture in request.fixturenames when executing test_a_and_b[mode_b]
tests/test_fixtures.py::test_default[mode_a] two
setup ['two', 'setup', 'request']
PASSED
tests/test_fixtures.py::test_a_and_b[mode_a] two
setup ['two', 'setup', 'request']
PASSED
tests/test_fixtures.py::test_a_and_b[mode_b] two
mode_b_only
setup ['two', 'setup', 'request']
PASSED
Is there any way to make it work or some patterns to do that differently?
In my case, setup is an external fixture I have to override & tweak its behavior.
pytest==3.3.1 under Ubuntu