@Test
public void testOptional() {

    Task task = new Task();
    Input input = new Input();
    input.setUri("http://localhost:7009/failure");
    input.setMethod("GET");
    task.getInputData().put(HttpTask.REQUEST_PARAMETER_NAME, input);
    httpTask.start(workflow, task, workflowExecutor);
    assertEquals("Task output: " + task.getOutputData(), Task.Status.FAILED, task.getStatus());
    assertEquals(ERROR_RESPONSE, task.getReasonForIncompletion());
    assertTrue(!task.getStatus().isSuccessful());
    task.setStatus(Status.SCHEDULED);
    task.getInputData().remove(HttpTask.REQUEST_PARAMETER_NAME);
    task.setReferenceTaskName("t1");
    httpTask.start(workflow, task, workflowExecutor);
    assertEquals(Task.Status.FAILED, task.getStatus());
    assertEquals(HttpTask.MISSING_REQUEST, task.getReasonForIncompletion());
    assertTrue(!task.getStatus().isSuccessful());
    WorkflowTask workflowTask = new WorkflowTask();
    workflowTask.setOptional(true);
    workflowTask.setName("HTTP");
    workflowTask.setWorkflowTaskType(TaskType.USER_DEFINED);
    workflowTask.setTaskReferenceName("t1");
    WorkflowDef def = new WorkflowDef();
    def.getTasks().add(workflowTask);
    Workflow workflow = new Workflow();
    workflow.setWorkflowDefinition(def);
    workflow.getTasks().add(task);
    MetadataDAO metadataDAO = mock(MetadataDAO.class);
    ExternalPayloadStorageUtils externalPayloadStorageUtils = mock(ExternalPayloadStorageUtils.class);
    ParametersUtils parametersUtils = mock(ParametersUtils.class);
    Configuration configuration = mock(Configuration.class);
    Map<String, TaskMapper> taskMappers = new HashMap<>();
    new DeciderService(parametersUtils, metadataDAO, externalPayloadStorageUtils, taskMappers, configuration).decide(workflow);
    System.out.println(workflow.getTasks());
    System.out.println(workflow.getStatus());
}