anchor.diff:              '' ;
             } // args );   
   
  +          
     simpleTest = as: (makeTest ({ ... }: as)).test;
   
   }
  
positive.code:         origBuilder = attrs.builder;   
        });
  
    runInMachineWithX = { require ? [], ...}@args :
      let
        client =
  
negative.code:       if t ? nodes then t.nodes else
        if t ? machine then { machine = t.machine; }
        else { };
        
      vms = buildVirtualNetwork { inherit nodes; };
      
      testScript =
        # Call the test script with the computed nodes.
        if builtins.isFunction t.testScript
        then t.testScript { inherit (vms) nodes; }
        else t.testScript;
        
      test = runTests vms testScript;
        
      report = makeReport test;
  
      # Generate a convenience wrapper for running the test driver
      # interactively with the specified network.
      driver = runCommand "nixos-test-driver"
        { buildInputs = [ makeWrapper];
          inherit testScript;
        }
        ''
          mkdir -p $out/bin
          ln -s ${vms}/bin/* $out/bin/
          ln -s ${testDriver}/bin/* $out/bin/
          wrapProgram $out/bin/nixos-test-driver \
            --add-flags "${vms}/vms/*/bin/run-*-vm" \
            --run "testScript=\"\$(cat $out/test-script)\"" \
            --set testScript '"$testScript"'
          echo "$testScript" > $out/test-script
        ''; # "
    };
  
    
    runInMachine =
      { drv
      , machine
  