factor out into common crate

items_2/src/test.rs

@@ -5,10 +5,11 @@ use crate::merger::{Mergeable, Merger};
 use crate::merger_cev::ChannelEventsMerger;
 use crate::testgen::make_some_boxed_d0_f32;
 use crate::Error;
-use crate::{binned_collected, runfut, ChannelEvents, Empty, Events, IsoDateTime};
+use crate::{binned_collected, runfut, ChannelEvents, Events, IsoDateTime};
 use chrono::{TimeZone, Utc};
 use futures_util::{stream, StreamExt};
 use items::{sitem_data, RangeCompletableItem, Sitemty, StreamItem};
+use items_0::Empty;
 use netpod::log::*;
 use netpod::timeunits::*;
 use netpod::{AggKind, BinnedRange, NanoRange, ScalarType, Shape};