Testing different implementations with pytest. To add/remove implementation for testing you need just change one line of code.

out

test_impls.py::test_integer_rounded_to_itself[do_round] PASSED                                                                                                                                                 [ 16%]
test_impls.py::test_integer_rounded_to_itself[cut] PASSED                                                                                                                                                      [ 33%]
test_impls.py::test_quarter_rounded_down[do_round] PASSED                                                                                                                                                      [ 50%]
test_impls.py::test_quarter_rounded_down[cut] PASSED                                                                                                                                                           [ 66%]
test_impls.py::test_three_fore_rounded_up[do_round] PASSED                                                                                                                                                     [ 83%]
test_impls.py::test_three_fore_rounded_up[cut] FAILED   

test_two_implementations.py

import pytest


def do_round(x: float) -> int:
    return int(round(x, 0))


def cut(x: float) -> int:
    return int(x)


functions_under_test = [do_round, cut]


@pytest.fixture(
    params=functions_under_test, ids=[x.__name__ for x in functions_under_test]
)
def function(request):
    return request.param


def test_integer_rounded_to_itself(function):
    assert function(1.0) == 1


def test_quarter_rounded_down(function):
    assert function(0.25) == 0