pytest fixture of fixture, not found

Based on this stackoverflow: pytest fixture of fixtures

I have the following code in the same file:

@pytest.fixture
def form_data(): return { ... }
@pytest.fixture
def example_event(form_data): return {... 'data': form_data, ... }

But when I run pytest, it complains that fixture 'form_data' not found

I am new to pytest so I am not even sure if this is possible?

1 Answer

Yes, it is possible.

If you have the test and all the fixtures in 1 file:test.py

import pytest
@pytest.fixture
def foo(): return "foo"
@pytest.fixture
def bar(foo): return foo, "bar"
def test_foo_bar(bar): expected = ("foo", "bar") assert bar == expected

and run pytest test.py then Success!!!

======================================= test session starts ========================================
platform darwin -- Python 3.6.8, pytest-4.3.0
collected 1 item
test.py . [100%]
===================================== 1 passed in 0.02 seconds =====================================

But if you put the fixtures in a different file: test_foo_bar.py

from test import bar
def test_foo_bar(bar): expected = ("foo", "bar") assert bar == expected

and run pytest test_foo_bar.py expecting (like I did) that importing only the bar fixture is enough since on importing it would already have executed the foo fixture then you get the error you are getting.

======================================= test session starts ========================================
platform darwin -- Python 3.6.8, pytest-4.3.0
collected 1 item
test2.py E [100%]
============================================== ERRORS ==============================================
__________________________________ ERROR at setup of test_foo_bar __________________________________
file .../test_foo_bar.py, line 3 def test_foo_bar(bar):
.../test.py, line 7 @pytest.fixture def bar(foo):
E fixture 'foo' not found
> available fixtures: TIMEOUT, bar, cache, capfd, capfdbinary, caplog, capsys, capsysbinary, cov, doctest_namespace, monkeypatch, no_cover, once_without_docker, pytestconfig, record_property, record_xml_attribute, recwarn, tmp_path, tmp_path_factory, tmpdir, tmpdir_factory
> use 'pytest --fixtures [testpath]' for help on them.
.../test.py:7
===================================== 1 error in 0.03 seconds ======================================

To fix this also import the foo fixture in the test_foo_bar.py module.