protected Map<String, Object> getNullStatisticsData() {
		Map<String, Object> result = new HashMap<>(1);
		result.put("test_time", getCurrentRunningTime() / 1000);
		return result;
	}
Get the statistics data. This method returns {@link Map} whose key is
string and it's mapped to the various statistics. Please refer
{@link #update(net.grinder.console.communication.ProcessControl.ProcessReports[])} ()}

@return map which contains the statistics data
ngrinder-core/src/main/java/net/grinder/SingleConsole.java