Using parametrize for multiple arguments in pytest

Question

There is such a function:

def underscore_concat(*args):
    return "_".join(filter(None, ([*args]))).upper()

How to correctly pass multiple parameters using pytest.mark.parametrize?

Something like this:

@pytest.mark.parametrize("a, result", [(["underscore", "concat", "test"], "UNDERSCORE_CONCAT_TEST")])
def test_underscore_concat(a, result):
    assert underscore_concat(**a) == result

Your code is working and looks alright, what's the problem exactly? — Tzane, Mar 03 '23 at 10:57
TypeError: sequence item 0: expected str instance, list found assert. Must be underscore_concat("underscore", "concat", "test") == result — Luice712, Mar 03 '23 at 11:27
You have to unpack lists with a single `*`, double `**` is for dictionaries. — Tzane, Mar 03 '23 at 11:40

score 0 · Accepted Answer · answered Mar 03 '23 at 12:09

0

@pytest.mark.parametrize("a, result", [(["underscore", "concat", "test"], "UNDERSCORE_CONCAT_TEST")])
def test_underscore_concat(a, result):
    assert underscore_concat(*a) == result

answered Mar 03 '23 at 12:09

Luice712

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Using parametrize for multiple arguments in pytest

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