@Test public void testIsEffector() throws Exception { Task<?> task = app.invoke(TestApplication.START, ImmutableMap.of("locations", ImmutableList.<Location>of())); Task<?> otherTask = execManager.submit(TaskBuilder.<Object>builder() .body(Callables.<Object>returning("val")) .build()); assertTrue(TaskPredicates.isEffector().apply(task)); assertFalse(TaskPredicates.isEffector().apply(otherTask)); }