'Initialize command line argument parser.'

@classmethod
def initArgumentParser(cls, parser, defaults=None):

    super(AppengineSmokeTestScenario, cls).initArgumentParser(parser, defaults=defaults)
    parser.add_argument('--test_gcs_bucket', default=None, help='URL    to    use    for    testing    appengine    deployment    from    a    bucket.    The    test    will    write    into    this    bucket    then    deploy    what    it    writes.')
    parser.add_argument('--git_repo_url', default=None, help='URL    of    a    GIT    source    code    repository    used    by    Spinnaker    to    deploy    to    App    Engine.')
    parser.add_argument('--branch', default='master', help='Git    branch    to    be    used    when    deploying    from    source    code    repository.')
    parser.add_argument('--app_directory_root', default=None, help='Path    from    the    root    of    source    code    repository    to    the    application    directory.')
