tests a null return . concode_field_sep Map<String,Object> stormConf concode_elem_sep ApplicationContext applicationContextMock concode_elem_sep Tuple tupleMock concode_elem_sep OutputCollector outputCollectorMock concode_elem_sep OutputFieldsDeclarer outputFieldsDeclarerMock concode_elem_sep ArgumentCaptor<Fields> outputFieldsCaptor concode_elem_sep TopologyContext topologyContextMock concode_field_sep void executionException concode_elem_sep void init concode_elem_sep void prototypeIntegrationRun concode_elem_sep void sideOperation concode_elem_sep void cleanup concode_elem_sep void run concode_elem_sep void pipe concode_elem_sep void bindingException concode_elem_sep void frameworkError concode_elem_sep void multiplexPassThroughWithScatter concode_elem_sep void passThroughOverlap