human
I wrote the below code

    from lettuce import step
    line = currentframe().f_lineno
    @step(u'the    variable    "(\\w+)"    holds    (\\d+)')
    @step(u'the    variable    "(\\w+)"    is    equal    to    (\\d+)')
    def just_pass(step, *args):
        pass
    filename = bg_feature_name('simple')
    runner = Runner(filename, verbosity=3, no_color=False)
    runner.run()
    assert_stdout_lines('\n\x1b[1;37mFeature:    Simple    and    successful                                                                \x1b[1;30m#    tests/functional/bg_features/simple/simple.feature:1\x1b[0m\n\x1b[1;37m        As    the    Lettuce    maintainer                                                                            \x1b[1;30m#    tests/functional/bg_features/simple/simple.feature:2\x1b[0m\n\x1b[1;37m        In    order    to    make    sure    the    output    is    pretty        \x1b[1;30m#    tests/functional/bg_features/simple/simple.feature:3\x1b[0m\n\x1b[1;37m        I    want    to    automate    its    test                                                                    \x1b[1;30m#    tests/functional/bg_features/simple/simple.feature:4\x1b[0m\n\n\x1b[1;37m        Background:\x1b[0m\n\x1b[1;30m                Given    the    variable    "X"    holds    2                                                \x1b[1;30m#    tests/functional/test_runner.py:{line}\x1b[0m\n\x1b[A\x1b[1;32m                Given    the    variable    "X"    holds    2                                                \x1b[1;30m#    tests/functional/test_runner.py:{line}\x1b[0m\n\n\x1b[1;37m        Scenario:    multiplication    changing    the    value    \x1b[1;30m#    tests/functional/bg_features/simple/simple.feature:9\x1b[0m\n\x1b[1;30m                Given    the    variable    "X"    is    equal    to    2                        \x1b[1;30m#    tests/functional/test_runner.py:{line}\x1b[0m\n\x1b[A\x1b[1;32m                Given    the    variable    "X"    is    equal    to    2                        \x1b[1;30m#   ...

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

@with_setup(prepare_stdout)
def test_output_background_with_success_colorful():