def METHOD_NAME(valid_instance_env_variables):
    with patch('tyr.helper.create_repositories', fake_create_repositories):
        instance = load_instance_config("FR-SE-lyon")
        assert instance.aliases_file == "/ed/aliases"
        assert instance.backup_directory == "/ed/backup"
        assert instance.exchange == "exchange"
        assert instance.is_free == True
        assert instance.name == "fr-se-lyon"
        assert instance.pg_port == 492
        assert not os.path.exists(instance.aliases_file)
        assert not os.path.exists(instance.backup_directory)