public ActivitiRule activitiRule = new ActivitiRule();
@Test
public void startProcess() throws Exception {
RepositoryService repositoryService = activitiRule.getRepositoryService();
repositoryService.createDeployment()
.addInputStream("MultiInstanceActivitiAttrs.bpmn20.xml", new FileInputStream(filename)).deploy();
RuntimeService runtimeService = activitiRule.getRuntimeService();
Map<String, Object> variableMap = new HashMap<String, Object>();
variableMap.put("assigneeList", Arrays.asList("user1", "user2", "user3"));
ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("MultiInstanceActivitiAttrs", variableMap);