Map<String, StoragePluginConfig> seConfigs = plan.getStorageEngines();
StoragePluginConfig config = seConfigs.get("donuts-json");
// Assert.assertTrue(config != null && config instanceof ClasspathRSE.ClasspathRSEConfig);
config = seConfigs.get("queue");
// Assert.assertTrue(config != null && config instanceof QueueRSE.QueueRSEConfig);
Scan scan = findOnlyOperator(plan, Scan.class);
Assert.assertEquals("donuts-json", scan.getStorageEngine());
Filter filter = findOnlyOperator(plan, Filter.class);
Assert.assertTrue(filter.getInput() instanceof Scan);
Project[] projects = Iterables.toArray(findOperator(plan, Project.class), Project.class);
Assert.assertEquals(2, projects.length);
Assert.assertEquals(1, projects[0].getSelections().length);