Add a unit test

src/tui/app/machine/fetch_state.rs

@@ -729,20 +729,23 @@ mod tests {
         assert!(matches!(app, AppState::Fetch(_)));
     }
 
-    #[test]
+    fn browse_release_group_expectation(artist: &Artist) -> MockIMbJobSender {
-    fn recv_err_empty_first() {
+        let requests = AppMachine::browse_release_group_job(&artist.meta.info.musicbrainz);
-        let mut collection = COLLECTION.clone();
-        collection[0].albums.clear();
-
-        let requests = AppMachine::browse_release_group_job(&collection[0].meta.info.musicbrainz);
-
         let mut mb_job_sender = MockIMbJobSender::new();
         mb_job_sender
             .expect_submit_background_job()
             .with(predicate::always(), predicate::eq(requests))
             .times(1)
             .return_once(|_, _| Ok(()));
+        mb_job_sender
+    }
 
+    #[test]
+    fn recv_err_empty_first() {
+        let mut collection = COLLECTION.clone();
+        collection[0].albums.clear();
+
+        let mb_job_sender = browse_release_group_expectation(&collection[0]);
         let inner = inner_with_mb(music_hoard(collection), mb_job_sender);
         let app = AppMachine::app_fetch_first(inner);
         assert!(matches!(app, AppState::Fetch(_)));
@@ -760,6 +763,20 @@ mod tests {
         assert!(matches!(app, AppState::Fetch(_)));
     }
 
+    #[test]
+    fn recv_err_disconnected_next() {
+        let mut collection = COLLECTION.clone();
+        collection[0].albums.clear();
+
+        let (_, rx) = mpsc::channel::<MbApiResult>();
+        let fetch = FetchState::search(rx);
+
+        let mb_job_sender = browse_release_group_expectation(&collection[0]);
+        let inner = inner_with_mb(music_hoard(collection), mb_job_sender);
+        let app = AppMachine::app_fetch_next(inner, fetch);
+        assert!(matches!(app, AppState::Fetch(_)));
+    }
+
     #[test]
     fn empty_first_then_ready() {
         let (tx, rx) = mpsc::channel::<MbApiResult>();