Unit test

src/tui/app/machine/match_state.rs

@@ -330,9 +330,12 @@ mod tests {
             machine::tests::{inner, inner_with_mb, input_event, music_hoard},
             IApp, IAppAccess, IAppInput,
         },
-        lib::interface::musicbrainz::{
-            api::Entity,
-            daemon::{MbParams, MockIMbJobSender},
+        lib::{
+            interface::musicbrainz::{
+                api::Entity,
+                daemon::{MbParams, MockIMbJobSender},
+            },
+            MockIMusicHoard,
         },
     };
 
@@ -660,14 +663,34 @@ mod tests {
         // (3) An album with a different album_id than the selected one.
         // (4) This album has an MBID that is identical to that of the selected match.
         let mb_ref = AlbumMbRef::Some(mbid().into());
-        let removed = Album::new(AlbumId::new("Not the Same").with_mb_ref(mb_ref));
+        let removed = Album::new(AlbumId::new("Album: Not the Same").with_mb_ref(mb_ref.clone()));
         artist.albums.push(removed.clone());
 
+        // (5) An album after the one that will be removed. Selection must remain on it.
+        let selected = Album::new(AlbumId::new("Album: Z"));
+        artist.albums.push(selected.clone());
+
         let (_tx, rx) = mpsc::channel();
         let app_matches = MatchState::new(matches_info.clone(), FetchState::search(rx));
 
         let collection = vec![artist];
-        let mut music_hoard = music_hoard(collection.clone());
+        let mut reduced = collection.clone();
+        reduced[0].albums.retain(|a| a.meta.id.mb_ref != mb_ref);
+
+        // We need a custom music_hoard to override the get_filtered expectations.
+        let mut music_hoard = MockIMusicHoard::new();
+        let mut seq = Sequence::new();
+        music_hoard
+            .expect_get_filtered()
+            .times(2)
+            .in_sequence(&mut seq)
+            .return_const(collection.clone());
+        music_hoard
+            .expect_get_filtered()
+            .times(1)
+            .in_sequence(&mut seq)
+            .return_const(reduced.clone());
+
         match matches_info {
             EntityMatches::Artist(_) => panic!(),
             EntityMatches::Album(matches) => {
@@ -678,7 +701,7 @@ mod tests {
                     .expect_get_collection()
                     .times(1)
                     .in_sequence(&mut seq)
-                    .return_const(collection);
+                    .return_const(collection.clone());
                 music_hoard
                     .expect_remove_album()
                     .times(1)
@@ -698,8 +721,26 @@ mod tests {
             }
         }
 
-        let matches = AppMachine::match_state(inner(music_hoard), app_matches);
-        matches.select().unwrap_fetch();
+        let mut matches = AppMachine::match_state(inner(music_hoard), app_matches);
+
+        // Make sure the last album is selected.
+        let selection = &mut matches.inner.selection;
+        selection.increment_category();
+        selection.increment_selection(&collection, Delta::Line);
+        selection.increment_selection(&collection, Delta::Line);
+
+        // Check that the correct album is selected.
+        let state = selection.state_album(&collection).unwrap();
+        let album = &collection[0].albums[state.index];
+        assert_eq!(album.meta, selected.meta);
+
+        let mut fetch = matches.select().unwrap_fetch();
+
+        // Check that the correct album is still selected in the reduced collection.
+        let selection = &mut fetch.inner.selection;
+        let state = selection.state_album(&reduced).unwrap();
+        let album = &reduced[0].albums[state.index];
+        assert_eq!(album.meta, selected.meta);
     }
 
     #[test]