human
I wrote the below code

    a = testdir.mkdir('a')
    fh = a.join('test_a.py')
    fh.write(_pytest._code.Source('\n                                import    pytest\n                                def    test_real():\n                                                pass\n                '))
    result = testdir.runpytest(a.strpath, a.strpath)
    result.stdout.fnmatch_lines(['*collected    1    item*'])

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

def test_skip_duplicates_by_default(testdir):