test: update _on_model_change asserts for new 3-tuple return shape

tests/test_app.py

@@ -2,15 +2,29 @@ import app
 
 
 def test_on_model_change_returns_base_defaults():
-    assert app._on_model_change("Base") == (25, 4.0)
+    steps, cfg, _lora_update = app._on_model_change("Base")
+    assert (steps, cfg) == (25, 4.0)
 
 
 def test_on_model_change_returns_turbo_defaults():
-    assert app._on_model_change("Turbo") == (8, 1.0)
+    steps, cfg, _lora_update = app._on_model_change("Turbo")
+    assert (steps, cfg) == (8, 1.0)
 
 
 def test_on_model_change_unknown_falls_back_to_turbo():
-    assert app._on_model_change("Edit") == (8, 1.0)
+    steps, cfg, _lora_update = app._on_model_change("Edit")
+    assert (steps, cfg) == (8, 1.0)
+
+
+def test_on_model_change_emits_lora_label_hinting_model_compat():
+    """Third element is a gr.update on the LoRA toggle whose label names the model."""
+    *_, base_update = app._on_model_change("Base")
+    *_, turbo_update = app._on_model_change("Turbo")
+    # gr.update returns a dict-like with the keyword args; both styles seen in Gradio 5.
+    base_label = getattr(base_update, "get", lambda *_: None)("label") or getattr(base_update, "label", None)
+    turbo_label = getattr(turbo_update, "get", lambda *_: None)("label") or getattr(turbo_update, "label", None)
+    assert base_label and "Z-Image" in base_label and "Turbo" not in base_label
+    assert turbo_label and "Z-Image-Turbo" in turbo_label
 
 
 def test_preview_cn_returns_none_when_no_image():