### Question:
DataGatherer implements Runnable { private List<VmDeployed> getVMList(List<EnergyUsageSource> energyUsers) { ArrayList<VmDeployed> answer = new ArrayList<>(); for (EnergyUsageSource item : energyUsers) { if (item.getClass().equals(VmDeployed.class)) { answer.add((VmDeployed) item); } } return answer; } DataGatherer(HostDataSource datasource, DatabaseConnector connector, Calibrator calibrator); void stop(); double getGeneralPurposeHostsPowerConsumption(); @Override void run(); void setRule(EnergyShareRule rule); HashMap<String, Host> getHostList(); HashMap<String, GeneralPurposePowerConsumer> getGeneralPurposeHostList(); Host getHost(String hostname); HashMap<String, VmDeployed> getVmList(); HashSet<VmDeployed> getVmList(String deploymentId); VmDeployed getVm(String name); VmDeployed getVm(int vmId); boolean setVm(VmDeployed vm); ArrayList<VmDeployed> getVMsOnHost(Host host); ArrayList<VmDeployed> getVMsOnHost(Host host, List<VmDeployed> activeVMs); void setPerformDataGathering(boolean performDataGathering); boolean performDataGathering();  }### Answer:
@Test public void testGetVmList() { System.out.println("getVmList"); DataGatherer instance = getDataGatherer(); HashMap<String, VmDeployed> result = instance.getVmList(); assert (!result.isEmpty()); for (VmDeployed vm : result.values()) { System.out.println("VM: " + vm.getName()); if (vm.getAllocatedTo() != null) { System.out.println("VM Host: " + vm.getAllocatedTo().getHostName()); } } }