def test_usage_help_shown():

    # Since John feels a bit lazy, he decides to skip reading the

    # documentation, and just run the tool to see if he gets any

    # useful help.

    process = subprocess.Popen(["gimmecert"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    stdout, stderr = process.communicate()

    stdout, stderr = stdout.decode(), stderr.decode()

    # John is presented with short usage instructions.

    assert "usage: gimmecert [-h]" in stdout

    assert stderr == ''

    assert process.returncode == 0