### Question:
NoopAggregator implements Aggregator { public static AggregatorFactory getFactory() { return AGGREGATOR_FACTORY; } private  NoopAggregator(); static AggregatorFactory getFactory(); @Override void mergeToAndReset(Aggregator aggregator); @Nullable @Override Point toPoint(long startEpochNanos, long epochNanos, Labels labels); @Override void recordLong(long value); @Override void recordDouble(double value); @Override boolean hasRecordings();  }### Answer:
@Test void factoryAggregation() { AggregatorFactory factory = NoopAggregator.getFactory(); assertThat(factory.getAggregator()).isInstanceOf(NoopAggregator.class); }