def expected_repnames(repos_cfg):
    """Generate expected repository names '{account_name}/{repo_name}'"""
    templ = "{account_name}/{repo_name}"
    lst = []
    for account_name, rep_cfg in repos_cfg.items():
        for repo_name in rep_cfg.keys():
            lst.append(
                templ.format(account_name=account_name, repo_name=repo_name)
            )
    return sorted(lst)