@Test
@SuppressWarnings("unchecked")
public void canCallCustomCommand() throws BindingConfigParseException {
DmxItem item = getValidInstance();
DmxService service = Mockito.mock(DmxService.class);
DmxCommand cmd = Mockito.mock(DmxCommand.class);
Map<String, DmxCommand> commands = (Map<String, DmxCommand>) Whitebox.getInternalState(item, "customCommands");
commands.put("ON", cmd);
item.processCommand(service, OnOffType.ON);