import pytest

@pytest.mark.parametrize(("a", "b", "expected"), [

    [1, 2, 3],

    [10, 11, 21],

    [1, 1, 1],

])

def test_1(a, b, expected):

    assert a + b == expected

if __name__ == "__main__":

    pytest.main(["-v"])

==================================

test_pytest.py::test_1[1-2-3] PASSED        [ 33%]

test_pytest.py::test_1[10-11-21] PASSED     [ 66%]

test_pytest.py::test_1[1-1-1] FAILED        [100%]