How to use the johnnydep.pipper.main function in johnnydep

def test_pipper_main(mocker, capsys, make_dist, tmp_path):
    make_dist(name="fakedist", version="1.2.3")
    mocker.patch("sys.argv", "pipper.py fakedist".split())
    with working_directory(tmp_path):
        johnnydep.pipper.main()
    out, err = capsys.readouterr()
    output = json.loads(out)
    path = output.pop("path")
    checksum = output.pop("checksum")
    assert output == {"url": "http://fakeindex/fakedist-1.2.3-py2.py3-none-any.whl"}
    assert os.path.isfile(path)
    assert os.path.basename(path) == "fakedist-1.2.3-py2.py3-none-any.whl"
    assert len(checksum) == 4 + 32
    assert checksum.startswith("md5=")
    assert err == ""