diff --git a/items_2/src/binsdim0.rs b/items_2/src/binsdim0.rs
index ed2cb72..c3de48c 100644
--- a/items_2/src/binsdim0.rs
+++ b/items_2/src/binsdim0.rs
@@ -101,7 +101,6 @@ impl<NTY: ScalarOps> BinsDim0<NTY> {
                 return false;
             }
         }
-        return true;
         for (a, b) in self.maxs.iter().zip(other.maxs.iter()) {
             if !a.equal_slack(b) {
                 return false;
diff --git a/streams/src/test/timebin.rs b/streams/src/test/timebin.rs
index 8f285ab..48da89d 100644
--- a/streams/src/test/timebin.rs
+++ b/streams/src/test/timebin.rs
@@ -40,7 +40,7 @@ fn time_bin_00() {
         let deadline = Instant::now() + Duration::from_millis(2000000);
         let mut binned_stream = crate::timebin::TimeBinnedStream::new(stream0, edges, true, deadline);
         while let Some(item) = binned_stream.next().await {
-            eprintln!("{item:?}");
+            //eprintln!("{item:?}");
             match item {
                 Ok(item) => match item {
                     StreamItem::DataItem(item) => match item {
@@ -66,3 +66,63 @@ fn time_bin_00() {
     };
     runfut(fut).unwrap()
 }
+
+#[test]
+fn time_bin_01() {
+    let fut = async {
+        let edges = [0, 1, 2, 3, 4, 5, 6, 7, 8].into_iter().map(|x| SEC * x).collect();
+        let evs0 = make_some_boxed_d0_f32(10, SEC * 1, MS * 500, 0, 1846713782);
+        let evs1 = make_some_boxed_d0_f32(10, SEC * 6, MS * 500, 0, 1846713781);
+        let v0 = ChannelEvents::Events(evs0);
+        let v1 = ChannelEvents::Events(evs1);
+        let stream0 = stream::iter(vec![
+            //
+            sitem_data(v0),
+            sitem_data(v1),
+        ]);
+        let stream0 = stream0.then({
+            let mut i = 0;
+            move |x| {
+                let delay = if i == 1 { 2000 } else { 0 };
+                i += 1;
+                let dur = Duration::from_millis(delay);
+                async move {
+                    tokio::time::sleep(dur).await;
+                    x
+                }
+            }
+        });
+        let stream0 = Box::pin(stream0);
+        let deadline = Instant::now() + Duration::from_millis(200);
+        let mut binned_stream = crate::timebin::TimeBinnedStream::new(stream0, edges, true, deadline);
+        while let Some(item) = binned_stream.next().await {
+            if true {
+                eprintln!("{item:?}");
+            }
+            match item {
+                Ok(item) => match item {
+                    StreamItem::DataItem(item) => match item {
+                        RangeCompletableItem::Data(item) => {
+                            if let Some(_) = item.as_any().downcast_ref::<BinsDim0<f32>>() {
+                            } else {
+                                return Err(Error::with_msg_no_trace(format!("bad, got item with unexpected type")));
+                            }
+                        }
+                        RangeCompletableItem::RangeComplete => {}
+                    },
+                    StreamItem::Log(_) => {}
+                    StreamItem::Stats(_) => {}
+                },
+                Err(e) => Err(e).unwrap(),
+            }
+        }
+        // TODO assert that we get the bins which are sure to be ready.
+        // TODO assert correct numbers.
+        // TODO assert that we don't get bins which may be still changing.
+        // TODO add similar test case with a RangeComplete event at different places before the timeout.
+        Ok(())
+    };
+    runfut(fut).unwrap()
+}
+
+// TODO add test case to observe RangeComplete after binning.
diff --git a/streams/src/timebin.rs b/streams/src/timebin.rs
index c489026..96bb723 100644
--- a/streams/src/timebin.rs
+++ b/streams/src/timebin.rs
@@ -115,8 +115,25 @@ where
             } else {
                 match self.deadline_fut.poll_unpin(cx) {
                     Ready(()) => {
-                        // TODO add timeout behavior
-                        todo!();
+                        trace2!("timeout");
+                        let self_range_complete = self.range_complete;
+                        if let Some(binner) = self.binner.as_mut() {
+                            trace2!("bins ready count before finish {}", binner.bins_ready_count());
+                            // TODO rework the finish logic
+                            if self_range_complete {
+                                binner.set_range_complete();
+                            }
+                            trace2!("bins ready count after finish  {}", binner.bins_ready_count());
+                            if let Some(bins) = binner.bins_ready() {
+                                self.done_data = true;
+                                return Ready(Some(sitem_data(bins)));
+                            } else {
+                                self.done_data = true;
+                                continue;
+                            }
+                        } else {
+                            continue;
+                        }
                     }
                     Pending => {}
                 }