Confuse about the test helper function [buildAccumulatorData]

[fearlessfe]

The function buildAccumulatorData in file fluffy/tests/test_helpers.nim

when accumulator.currentEpoch.len() equal to epochSize, add the currentEpoch to epochAccumulators

but in the updateAccumulator, when currentEpoch.currentEpoch.len() equal to epochSize, a new epoch will start

so after call the updateAccumulator, the length of currentEpoch will nevel be the epochSize