anchor.diff:        { pkgs, ... }:
   
         {
  -        users.users.testuser = { isSystemUser = true; };
  -        users.users.testuser2 = { isSystemUser = true; };
  +        imports = [ users ];
  +
           services.mysql.enable = true;
           services.mysql.initialDatabases = [
             { name = "testdb3"; schema = ./testdb.sql; }
  
positive.code: import ./../make-test-python.nix ({ pkgs, ...} : {
    name = "mysql";
    meta = with pkgs.lib.maintainers; {
      maintainers = [ eelco shlevy ];
  
negative.code:       { pkgs, ... }:
  
        {
          imports = [ users ];
  
          services.mysql.enable = true;
          services.mysql.initialScript = pkgs.writeText "mariadb-init.sql" ''
            ALTER USER root@localhost IDENTIFIED WITH unix_socket;
  