anchor.diff:        rpcAddress = ipAddress;
         seedAddresses = [ "192.168.1.1" ];
         package = testPackage;
  +      maxHeapSize = "${numMaxHeapSize}M";
  +      heapNewSize = "100M";
       };
     nodeCfg = ipAddress: extra: {pkgs, config, ...}:
       { environment.systemPackages = [ testPackage ];
  
positive.code:   # Change this to test a different version of Cassandra:
    testPackage = pkgs.cassandra;
    clusterName = "NixOS Automated-Test Cluster";
  
    cassandraCfg = ipAddress:
      { enable = true;
  
negative.code:       $cass0->waitUntilSucceeds("nc -z localhost 7199");
        $cass0->waitUntilSucceeds("nodetool describecluster | grep 'Name: ${clusterName}'");
      };
      subtest "Heap limit set correctly", sub {
        # Nodetool takes a while until it can display info
        $cass0->waitUntilSucceeds('nodetool info');
        $cass0->succeed('${checkHeapLimitCommand}');
      };
  
      # Check cluster interaction
      subtest "Bring up cluster", sub {
  