Example of Pytest parameterization of tests

test_chicken.py

import re
import pytest


def camel_to_snake(string):
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', string)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()


CASES = [
    ('ISeeALittle', 'i_see_a_little'),
    ('iSeeALittle', 'i_see_a_little'),
    ('NotInventedHere', 'not_invented_here'),
    ('notInventedHere', 'not_invented_here'),
    ('JKRowling', 'j_k_rowling'),
    ('URRight', 'u_r_right')
]


@pytest.mark.parametrize("orig,expected", CASES)
def test(orig, expected):
    assert camel_to_snake(orig) == expected

test/test_chicken.py::test[ISeeALittle-i_see_a_little] PASSED        [ 16%]
test/test_chicken.py::test[iSeeALittle-i_see_a_little] PASSED        [ 33%]
test/test_chicken.py::test[NotInventedHere-not_invented_here] PASSED [ 50%]
test/test_chicken.py::test[notInventedHere-not_invented_here] PASSED [ 66%]
test/test_chicken.py::test[JKRowling-j_k_rowling] FAILED             [ 83%]
test/test_chicken.py::test[URRight-u_r_right] FAILED                 [100%]