@Test
 public void testPreviewer() throws PipelineStoreException {
   pipelineStoreTask.create("user", "abcd", "blah", false);
   Previewer previewer = pipelineManager.createPreviewer("user", "abcd", "0");
   assertEquals(previewer, pipelineManager.getPreviewer(previewer.getId()));
   ((StandaloneAndClusterPipelineManager) pipelineManager).outputRetrieved(previewer.getId());
   assertNull(pipelineManager.getPreviewer(previewer.getId()));
 }