Does pytest parametrized test work with unittest class based tests?

Question

I've been trying to add parametrized @pytest.mark.parametrize tests to a class based unittest.

class SomethingTests(unittest.TestCase):
    @pytest.mark.parametrize(('one', 'two'), [
        (1, 2), (2, 3)])
    def test_default_values(self, one, two):
        assert one == (two + 1)

But the parametrized stuff didn't kick in:

TypeError: test_default_values() takes exactly 3 arguments (1 given)

I've switched to simple class based tests (without unittest). But I'd like to know if anyone tried it and it worked.

falsetru · Accepted Answer · 2013-08-12 13:04:03Z

57

According to pytest documentation:

unittest.TestCase methods cannot directly receive fixture function arguments as implementing that is likely to inflict on the ability to run general unittest.TestCase test suites.

answered Aug 12, 2013 at 13:04

falsetru

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Michael Mintz · Accepted Answer · 2023-06-15 12:38:03Z

17

There's a simple workaround to parameterize unittest-based Python tests by using "parameterized": https://pypi.org/project/parameterized/

Here's a simple example. First install "parameterized": pip install parameterized==0.9.0

import unittest
from parameterized import parameterized

class MyTestClass(unittest.TestCase):

    @parameterized.expand([
        ["One", "Two"],
        ["Three", "Four"],
        ["Five", "Six"],
    ])
    def test_parameterized(self, arg1, arg2):
        print(arg1, arg2)

Now you can easily run your code with pytest

I've successfully used this technique to parameterize selenium browser tests that use the SeleniumBase framework on GitHub in this example.

edited Jun 15, 2023 at 12:38

answered Aug 28, 2018 at 16:25

Michael Mintz

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4 Comments

alanjds Over a year ago

Note that, to use mocks, you should decorate behind the @parametrized and should "collect" the mock at the end of the args list (arg3 maybe). I just tried it.

dataviews Over a year ago

this doesn't solve the need to indirect parameterization, though :/

Surendranatha Reddy T Over a year ago

I am getting error "TypeError: 'list' object is not callable"

user3441246 Over a year ago

I'm using 0.8.1 and it needs a LIST of the function arguments for each test, provided in a TUPLE format. E.g. my function takes one input so I'm doing: @parameterized.expand([(20.0,), (0.0,)])

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