@Test
public void test_createSamplerAggregator() {
Aggregator aggregator = AggregatorFactory.createSamplerAggregator();
assertThat(aggregator.getName(), equalTo("sampler"));
}
@Test
public void test_createDiffAggregator() {
Aggregator aggregator = AggregatorFactory.createDiffAggregator();
assertThat(aggregator.getName(), equalTo("diff"));
}