anchor.diff:      mariadb.succeed(
           "echo 'use testdb; insert into tests values (42);' | sudo -u testuser mysql -u testuser"
       )
  +    # Ensure testuser2 is not able to insert into testdb as mysql testuser2
  +    mariadb.fail(
  +        "echo 'use testdb; insert into tests values (23);' | sudo -u testuser2 mysql -u testuser2"
  +    )
  +    # Ensure testuser2 is not able to authenticate as mysql testuser
  +    mariadb.fail(
  +        "echo 'use testdb; insert into tests values (23);' | sudo -u testuser2 mysql -u testuser"
  +    )
       mariadb.succeed(
           "echo 'use testdb; select test_id from tests;' | sudo -u testuser mysql -u testuser -N | grep 42"
       )
  
positive.code:           DELETE FROM mysql.user WHERE user = ''';
            FLUSH PRIVILEGES;
          '';
          services.mysql.ensureDatabases = [ "testdb" ];
          services.mysql.ensureUsers = [{
            name = "testuser";
            ensurePermissions = {
              "testdb.*" = "ALL PRIVILEGES";
            };
          }];
          services.mysql.package = pkgs.mariadb;
  
negative.code: 
        {
          users.users.testuser = { };
          users.users.testuser2 = { };
          services.mysql.enable = true;
          services.mysql.initialScript = pkgs.writeText "mariadb-init.sql" ''
            ALTER USER root@localhost IDENTIFIED WITH unix_socket;
  