anchor.diff:  with pkgs.lib;
   
   let
  -  redmineTest = package: makeTest {
  +  mysqlTest = package: makeTest {
       machine =
         { config, pkgs, ... }:
         { services.mysql.enable = true;
  
positive.code:   };
  in
  {
    redmine_3 = redmineTest pkgs.redmine // {
      name = "redmine_3";
      meta.maintainers = [ maintainers.aanderse ];
    };
  
    redmine_4 = redmineTest pkgs.redmine_4 // {
      name = "redmine_4";
      meta.maintainers = [ maintainers.aanderse ];
    };
  }
  
negative.code: 
          services.redmine.enable = true;
          services.redmine.package = package;
          services.redmine.database.type = "mysql2";
          services.redmine.database.socket = "/run/mysqld/mysqld.sock";
          services.redmine.plugins = {
            redmine_env_auth = pkgs.fetchurl {
  