@spec currently_running_os_process_ids() :: [String.t()]

@spec prepare_new_version_of_core(boolean()) :: Antikythera.VersionStr.t()

@spec prepare_new_version_of_gear(Path.t(), boolean()) :: String.t()

@spec setup([Path.t()]) :: :ok

@spec teardown() :: :ok

@spec wait_until_upgrade_applied(atom(), String.t()) :: :ok