Correct GUI state emulation (#1422)

tests/gui/test_app.py

@@ -240,9 +240,12 @@ def assert_frame_chunk_suggestion_ui_updated(
 
     # Set up to test labeled frames data cache
     app.labels = min_tracks_2node_labels
-    video = app.labels.video
+    video_clip = app.labels.video
+    app.state["labels"] = app.labels
+    app.state["video"] = video_clip
+    app.on_data_update([UpdateTopic.all])
     num_samples = 5
-    frame_delta = video.num_frames // num_samples
+    frame_delta = video_clip.num_frames // num_samples
 
     # Add suggestions
     app.labels.suggestions = VideoFrameSuggestions.suggest(
@@ -274,7 +277,7 @@ def assert_frame_chunk_suggestion_ui_updated(
             (l_suggestion.video, l_suggestion.frame_idx), use_cache=True
         )
         assert type(lf) == LabeledFrame
-        assert lf.video == video
+        assert lf.video == video_clip
         assert lf.frame_idx == prev_idx + frame_delta
         prev_idx = l_suggestion.frame_idx
 
@@ -284,8 +287,6 @@ def assert_frame_chunk_suggestion_ui_updated(
 
     assert len(app.labels.videos) == 2
 
-    app.state["video"] = centered_pair_vid
-
     # Generate suggested frames in both videos
     app.labels.clear_suggestions()
     num_samples = 3
@@ -311,11 +312,11 @@ def assert_frame_chunk_suggestion_ui_updated(
     assert app.state["selected_video"] == small_robot_mp4_vid
     app.commands.removeVideo()
     assert len(app.labels.videos) == 1
-    assert app.state["video"] == centered_pair_vid
+    assert app.state["video"] == video_clip
 
     # Verify frame suggestions from video 1 are removed
     for sugg in app.labels.suggestions:
-        assert sugg.video == app.labels.videos[0]
+        assert sugg.video == video_clip
 
 
 def test_app_new_window(qtbot):