pytest fixture of fixture, not found

Question

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?

Answer 1

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.