Source:
<code>public void setUp() { this.mockAppDesc = mock(StreamApplicationDescriptorImpl.class); String inputStreamId1 = "test-input-1"; String outputStreamId = "test-output-1"; InputOperatorSpec testInput = new InputOperatorSpec(inputStreamId1, new NoOpSerde(), new NoOpSerde(), null, true, inputStreamId1); StreamOperatorSpec filterOp = OperatorSpecs.createFilterOperatorSpec(m -> true, "test-filter-2"); OutputStreamImpl outputStream1 = new OutputStreamImpl(outputStreamId, null, null, true); OutputOperatorSpec outputSpec = OperatorSpecs.createSendToOperatorSpec(outputStream1, "test-output-3"); testInput.registerNextOperatorSpec(filterOp); filterOp.registerNextOperatorSpec(outputSpec); String streamId2 = "test-input-2"; InputOperatorSpec testInput2 = new InputOperatorSpec(streamId2, new NoOpSerde(), new NoOpSerde(), null, true, "test-input-4"); StreamOperatorSpec testMap = OperatorSpecs.createMapOperatorSpec(m -> m, "test-map-5"); SinkOperatorSpec testSink = OperatorSpecs.createSinkOperatorSpec((m, mc, tc) -> { <START> return m; <END> }, "test-sink-6"); testInput2.registerNextOperatorSpec(testMap); testMap.registerNextOperatorSpec(testSink); this.inputOpSpecMap = new LinkedHashMap<>(); inputOpSpecMap.put(inputStreamId1, testInput); inputOpSpecMap.put(streamId2, testInput2); this.outputStrmMap = new LinkedHashMap<>(); outputStrmMap.put(outputStreamId, outputStream1); when(mockAppDesc.getInputOperators()).thenReturn(Collections.unmodifiableMap(inputOpSpecMap)); when(mockAppDesc.getOutputStreams()).thenReturn(Collections.unmodifiableMap(outputStrmMap)); this.allOpSpecs = new HashSet<OperatorSpec>() { { this.add(testInput); this.add(filterOp); this.add(outputSpec); this.add(testInput2); this.add(testMap); this.add(testSink); } }; }</code><technical_language>do need return message</technical_language>

Target:
public void setUp() { this.mockAppDesc = mock(StreamApplicationDescriptorImpl.class); String inputStreamId1 = "test-input-1"; String outputStreamId = "test-output-1"; InputOperatorSpec testInput = new InputOperatorSpec(inputStreamId1, new NoOpSerde(), new NoOpSerde(), null, true, inputStreamId1); StreamOperatorSpec filterOp = OperatorSpecs.createFilterOperatorSpec(m -> true, "test-filter-2"); OutputStreamImpl outputStream1 = new OutputStreamImpl(outputStreamId, null, null, true); OutputOperatorSpec outputSpec = OperatorSpecs.createSendToOperatorSpec(outputStream1, "test-output-3"); testInput.registerNextOperatorSpec(filterOp); filterOp.registerNextOperatorSpec(outputSpec); String streamId2 = "test-input-2"; InputOperatorSpec testInput2 = new InputOperatorSpec(streamId2, new NoOpSerde(), new NoOpSerde(), null, true, "test-input-4"); StreamOperatorSpec testMap = OperatorSpecs.createMapOperatorSpec(m -> m, "test-map-5"); SinkOperatorSpec testSink = OperatorSpecs.createSinkOperatorSpec((m, mc, tc) -> { }, "test-sink-6"); testInput2.registerNextOperatorSpec(testMap); testMap.registerNextOperatorSpec(testSink); this.inputOpSpecMap = new LinkedHashMap<>(); inputOpSpecMap.put(inputStreamId1, testInput); inputOpSpecMap.put(streamId2, testInput2); this.outputStrmMap = new LinkedHashMap<>(); outputStrmMap.put(outputStreamId, outputStream1); when(mockAppDesc.getInputOperators()).thenReturn(Collections.unmodifiableMap(inputOpSpecMap)); when(mockAppDesc.getOutputStreams()).thenReturn(Collections.unmodifiableMap(outputStrmMap)); this.allOpSpecs = new HashSet<OperatorSpec>() { { this.add(testInput); this.add(filterOp); this.add(outputSpec); this.add(testInput2); this.add(testMap); this.add(testSink); } }; }