Factored into separate crate

src/teststream.rs

@@ -0,0 +1,36 @@
+use crate::timebin::cached::reader::EventsReadProvider;
+use crate::timebin::cached::reader::EventsReading;
+use futures_util::Stream;
+use items_0::streamitem::sitem_err2_from_string;
+use items_0::streamitem::Sitemty;
+use items_2::channelevents::ChannelEvents;
+use netpod::range::evrange::SeriesRange;
+use query::api4::events::EventsSubQuery;
+use std::pin::Pin;
+
+fn make_stream(chname: &str, range: &SeriesRange) -> Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>> {
+    if chname == "unittest;scylla;cont;scalar;f32" {
+        let e = sitem_err2_from_string(format!("unknown channel {chname}"));
+        let ret = futures_util::stream::iter([Err(e)]);
+        Box::pin(ret)
+    } else {
+        let e = sitem_err2_from_string(format!("unknown channel {chname}"));
+        let ret = futures_util::stream::iter([Err(e)]);
+        Box::pin(ret)
+    }
+}
+
+pub struct UnitTestStream {}
+
+impl UnitTestStream {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl EventsReadProvider for UnitTestStream {
+    fn read(&self, evq: EventsSubQuery) -> EventsReading {
+        let stream = make_stream(evq.name(), evq.range());
+        EventsReading::new(stream)
+    }
+}