.row(new Object[] {expectedValue})
.build();
// verify addInput(Page)
Aggregator aggregator1 = createAggregator(definition, Step.SINGLE);
aggregator1.addValue(input);
assertEquals(getResult(function.getFinalTupleInfo(), aggregator1), expected);
// verify addInput(BlockCursors...)
Aggregator aggregator2 = createAggregator(definition, Step.SINGLE);