pytest.mark.parameterize not "finding" fixtures

Question

I’m writing tests for a small library and I decided to use py.test after hearing so many good things about it.

However, pytest.mark.parameterize is giving me some issues. At first, I thought maybe I just mismatched some parens and it went off looking for a fixture elsewhere. So I decided to start with the given example of parameterize:

@pytest.mark.parametrize("input,expected", [
    ("3+5", 8),
    ("2+4", 6),
    ("6*9", 42),
])
def test_eval(input, expected):
    assert eval(input) == expected

But this gives the same error:

fixture ‘input’ not found

available fixtures: capfd, pytestconfig, recwarn, capsys, tmpdir, monkeypatch

use ‘py.test –fixtures [testpath]’ for help on them.

I went off googling, but I couldn’t find any answers that applied. Any ideas on how to approach this?

Edit: I suppose knowing which Python/py.test versions is helpful.

Python 3.4.0 and py.test 2.6.4

Asked By: justanr

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Source

Answer 1

I just tried your example verbatim and it worked fine in pytest 2.6.4. Perhaps you are misspelling parametrize? You misspelled it in the title and is a common mistake, as can be seen in this issue.

Answered By: Bruno Oliveira

Answer 2

It’s not the same cause, but this is the first result on google for "pytest parametrize fixture not found", which was my natural google for the same error as OP:

E fixture ‘blah’ not found

In my case it was due to a silly typo (which I didn’t spot for far too long!), missing the @ from the decorator:

pytest.mark.parametrize("blah", [50, 100])
def test_something(blah):
    assert blah > 0

Answered By: Indivicivet

Answer 3

In my case, I changed a dataclass to "@pytest.mark.parametrize".

I forgot "@pytest.mark.parametrize" is a decorator.
Therefore I didn’t put the decorator above the function and between the decorator and the function, there were other functions.

@pytest.mark.parametrize("input,expected", [
    ("3+5", 8),
    ("2+4", 6),
    ("6*9", 42),
])

def test_otherfunctions():
    """ a function unrelated to the decorator. """
    pass

#the decorator should be here.
def test_eval(input, expected):
    assert eval(input) == expected

Answered By: Constantin Hong

pytest.mark.parameterize not "finding" fixtures

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