SearchReferencesCommand command = new SearchReferencesCommand();
command.referenceSetId = "refSetId";
Mockito.when(references.search(Mockito.any(SearchReferencesRequest.class)))
.thenReturn(referencesSearch);
Mockito.when(referencesSearch.execute()).thenReturn(new SearchReferencesResponse()
.setReferences(Lists.<Reference>newArrayList()));
command.handleRequest(genomics);
}