FirstHistoryMetaAggregator extends AbstractMetadataAggregator { @Override public MetadataElement getMetadata() { return inputsMetaElement; }  @Override void aggregateMetadata(Product product); @Override void aggregateMetadata(MetadataElement processingGraphElement); @Override MetadataElement getMetadata();  }
@Test public void testAggregateNoProducts() { final MetadataElement metadataElement = aggregator.getMetadata(); TestHelper.assertCorrectNameAndNoAttributes(metadataElement); assertEquals(0, metadataElement.getNumElements()); }