Fix poll_idle test race

tokio-postgres/tests/test/main.rs

@@ -686,25 +686,29 @@ fn transaction_builder_around_moved_client() {
 }
 
 #[test]
-fn poll_idle() {
+fn poll_idle_running() {
-    struct IdleFuture {
+    struct DelayStream(Delay);
-        client: tokio_postgres::Client,
+
-        query: Option<tokio_postgres::Prepare>,
+    impl Stream for DelayStream {
+        type Item = Vec<u8>;
+        type Error = tokio_postgres::Error;
+
+        fn poll(&mut self) -> Poll<Option<Vec<u8>>, tokio_postgres::Error> {
+            try_ready!(self.0.poll().map_err(|e| panic!("{}", e)));
+            QUERY_DONE.store(true, Ordering::SeqCst);
+            Ok(Async::Ready(None))
+        }
     }
 
+    struct IdleFuture(tokio_postgres::Client);
+
     impl Future for IdleFuture {
         type Item = ();
         type Error = tokio_postgres::Error;
 
         fn poll(&mut self) -> Poll<(), tokio_postgres::Error> {
-            if let Some(_) = self.query.take() {
+            try_ready!(self.0.poll_idle());
-                assert!(!self.client.poll_idle().unwrap().is_ready());
-                return Ok(Async::NotReady);
-            }
-
-            try_ready!(self.client.poll_idle());
             assert!(QUERY_DONE.load(Ordering::SeqCst));
-
             Ok(Async::Ready(()))
         }
     }
@@ -718,18 +722,59 @@ fn poll_idle() {
     let connection = connection.map_err(|e| panic!("{}", e));
     runtime.handle().spawn(connection).unwrap();
 
-    let stmt = runtime.block_on(client.prepare("SELECT 1")).unwrap();
+    let execute = client.batch_execute("CREATE TEMPORARY TABLE foo (id INT)");
+    runtime.block_on(execute).unwrap();
 
-    let query = client
+    let prepare = client.prepare("COPY foo FROM STDIN");
-        .query(&stmt, &[])
+    let stmt = runtime.block_on(prepare).unwrap();
-        .collect()
+    let copy_in = client.copy_in(
-        .map(|_| QUERY_DONE.store(true, Ordering::SeqCst))
+        &stmt,
-        .map_err(|e| panic!("{}", e));
+        &[],
-    runtime.spawn(query);
+        DelayStream(Delay::new(Instant::now() + Duration::from_millis(10))),
+    );
+    let copy_in = copy_in.map(|_| ()).map_err(|e| panic!("{}", e));
+    runtime.spawn(copy_in);
 
+    let future = IdleFuture(client);
+    runtime.block_on(future).unwrap();
+}
+
+#[test]
+fn poll_idle_new() {
+    struct IdleFuture {
+        client: tokio_postgres::Client,
+        prepare: Option<tokio_postgres::Prepare>,
+    }
+
+    impl Future for IdleFuture {
+        type Item = ();
+        type Error = tokio_postgres::Error;
+
+        fn poll(&mut self) -> Poll<(), tokio_postgres::Error> {
+            match self.prepare.take() {
+                Some(_future) => {
+                    assert!(!self.client.poll_idle().unwrap().is_ready());
+                    Ok(Async::NotReady)
+                }
+                None => {
+                    assert!(self.client.poll_idle().unwrap().is_ready());
+                    Ok(Async::Ready(()))
+                }
+            }
+        }
+    }
+
+    let _ = env_logger::try_init();
+    let mut runtime = Runtime::new().unwrap();
+
+    let (mut client, connection) = runtime.block_on(connect("user=postgres")).unwrap();
+    let connection = connection.map_err(|e| panic!("{}", e));
+    runtime.handle().spawn(connection).unwrap();
+
+    let prepare = client.prepare("");
     let future = IdleFuture {
-        query: Some(client.prepare("")),
         client,
+        prepare: Some(prepare),
     };
     runtime.block_on(future).unwrap();
 }