1 files changed, 88 insertions, 0 deletions
diff --git a/tests/errors.rs b/tests/errors.rs
new file mode 100644
index 0000000..646c64d
--- /dev/null
+++ b/tests/errors.rs
@@ -0,0 +1,88 @@
+// this fails because once there are no more events actively being processed,
+// the stream doesn't have anything else to do (so it can't return Ready), but
+// also no underlying future or stream has returned NotReady (so it can't
+// return NotReady), so it has no valid action to take.
+
+mod run;
+
+#[derive(Debug, PartialEq, Eq)]
+struct InputEvent(u32);
+#[derive(Debug, PartialEq, Eq)]
+struct OutputEvent(u32);
+
+impl InputEvent {
+    fn into_output_event(
+        self,
+    ) -> impl futures::future::Future<Item = OutputEvent, Error = String>
+    {
+        let InputEvent(i) = self;
+        futures::future::ok(OutputEvent(i))
+    }
+}
+
+enum State {
+    Waiting,
+    Processing(
+        Box<
+            dyn futures::future::Future<Item = OutputEvent, Error = String>
+                + Send,
+        >,
+    ),
+}
+
+struct IdleStream {
+    state: State,
+}
+
+impl IdleStream {
+    fn new() -> Self {
+        Self {
+            state: State::Waiting,
+        }
+    }
+
+    fn process(&mut self, event: InputEvent) {
+        self.state = State::Processing(Box::new(event.into_output_event()));
+    }
+}
+
+impl IdleStream {
+    #[allow(clippy::type_complexity)]
+    const POLL_FNS:
+        &'static [&'static dyn for<'a> Fn(
+            &'a mut Self,
+        )
+            -> component_future::Poll<
+            Option<OutputEvent>,
+            String,
+        >] = &[&Self::poll_state];
+
+    fn poll_state(
+        &mut self,
+    ) -> component_future::Poll<Option<OutputEvent>, String> {
+        if let State::Processing(fut) = &mut self.state {
+            let output_event = component_future::try_ready!(fut.poll());
+            self.state = State::Waiting;
+            Ok(component_future::Async::Ready(Some(output_event)))
+        } else {
+            Ok(component_future::Async::NothingToDo)
+        }
+    }
+}
+
+impl futures::stream::Stream for IdleStream {
+    type Item = OutputEvent;
+    type Error = String;
+
+    fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
+        component_future::poll_stream(self, Self::POLL_FNS)
+    }
+}
+
+#[test]
+#[should_panic]
+fn test_panic() {
+    let mut stream = IdleStream::new();
+    stream.process(InputEvent(1));
+    let _ = run::stream(stream);
+}