human
Here's a good function header given the following:
I wrote the below code

    py_file = testdir.makepyfile("\n                                import    pytest\n\n                                @pytest.mark.parametrize('foo,    bar',    [(1,    2,    3)])\n                                def    test_func(foo,    bar):\n                                                pass\n                ")
    result = testdir.runpytest(py_file)
    result.stdout.fnmatch_lines(['E            ValueError:    In    "parametrize"    the    number    of    values    ((1,    2,    3))    must    be    equal    to    the    number    of    names    ([\'foo\',    \'bar\'])'])

What's a good function header?
assistant
#Here's a good function header.

def test_parametrized_collect_with_wrong_args(testdir):