human
I wrote the below code

    monkeypatch.delenv('USER', raising=False)
    monkeypatch.delenv('USERNAME', raising=False)
    testdir.makepyfile('\n                                import    pytest\n                                def    test_some(tmpdir):\n                                                assert    tmpdir.isdir()\n                ')
    reprec = testdir.inline_run()
    reprec.assertoutcome(passed=1)

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

def test_tmpdir_fallback_tox_env(testdir, monkeypatch):