anchor.diff:                              true = (Srv2State =:= "{state,42}"),
                               State
                           end,
  -    ok = upgrade_downgrade("relapp1", "1.0.11", "1.0.12",
  +    ok = upgrade_downgrade("relapp1", ["1.0.11", "1.0.12"],
                              [{before_upgrade, BeforeUpgradeFun},
                               {after_upgrade, AfterUpgradeFun},
                               {after_downgrade, AfterDowngradeFun}],
  
positive.code:                                    FromVersion, ToVersion,
                                     Hooks,
                                     Config),
      ok.
  
  release_upgrade_downgrade(RelDir, AppName,
                            FromVersion, ToVersion,
  
negative.code: empty_appup(doc) -> ["Generate an empty appup"];
  empty_appup(suite) -> [];
  empty_appup(Config) when is_list(Config) ->
      ok = upgrade_downgrade("relapp1", ["1.0.0", "1.0.1"],
                             {[], []},
                             Config),
      ok.
  