### Question:
KTableAggregate implements KTableProcessorSupplier<K, V, T> { @Override public Processor<K, Change<V>> get() { return new KTableAggregateProcessor(); } KTableAggregate(String storeName, Initializer<T> initializer, Aggregator<? super K, ? super V, T> add, Aggregator<? super K, ? super V, T> remove); @Override void enableSendingOldValues(); @Override Processor<K, Change<V>> get(); @Override KTableValueGetterSupplier<K, T> view();  }### Answer:
@Test public void shouldForwardToCorrectProcessorNodeWhenMultiCacheEvictions() throws Exception { final String tableOne = "tableOne"; final String tableTwo = "tableTwo"; final KStreamBuilder builder = new KStreamBuilder(); final String reduceTopic = "TestDriver-reducer-store-repartition"; final Map<String, Long> reduceResults = new HashMap<>(); final KTable<String, String> one = builder.table(Serdes.String(), Serdes.String(), tableOne, tableOne); final KTable<Long, String> two = builder.table(Serdes.Long(), Serdes.String(), tableTwo, tableTwo); final KTable<String, Long> reduce = two.groupBy(new KeyValueMapper<Long, String, KeyValue<String, Long>>() { @Override public KeyValue<String, Long> apply(final Long key, final String value) { return new KeyValue<>(value, key); } }, Serdes.String(), Serdes.Long()) .reduce(new Reducer<Long>() { @Override public Long apply(final Long value1, final Long value2) { return value1 + value2; } }, new Reducer<Long>() { @Override public Long apply(final Long value1, final Long value2) { return value1 - value2; } }, "reducer-store"); reduce.foreach(new ForeachAction<String, Long>() { @Override public void apply(final String key, final Long value) { reduceResults.put(key, value); } }); one.leftJoin(reduce, new ValueJoiner<String, Long, String>() { @Override public String apply(final String value1, final Long value2) { return value1 + ":" + value2; } }) .mapValues(new ValueMapper<String, String>() { @Override public String apply(final String value) { return value; } }); driver = new KStreamTestDriver(builder, stateDir, 111); driver.process(reduceTopic, "1", new Change<>(1L, null)); driver.process("tableOne", "2", "2"); driver.process(reduceTopic, "2", new Change<>(2L, null)); driver.process(reduceTopic, "2", new Change<>(2L, null)); assertEquals(Long.valueOf(2L), reduceResults.get("2")); driver.process("tableOne", "1", "5"); assertEquals(Long.valueOf(4L), reduceResults.get("2")); }