Drop the comparison slider, drag the zoom point, allow 8 steps

test_app_smoke.py

@@ -49,9 +49,10 @@ def test_the_interface_builds(app):
     assert app.demo.blocks and app.demo.fns
 
 
-def test_preview_returns_a_canvas_and_tolerates_no_image(app, photo):
+def test_preview_returns_a_canvas_for_an_upload_and_for_nothing_yet(app, photo):
     assert app.preview(photo, 4, 0.3, 0.7).size == (512, 512)
-    assert app.preview(None, 4, 0.5, 0.5) is None
+    # Never None: a visitor touching a slider before uploading must not blank the overlay.
+    assert app.preview(None, 4, 0.5, 0.5).size == (512, 512)
 
 
 def test_declared_duration_grows_with_depth(app, photo):
@@ -60,11 +61,24 @@ def test_declared_duration_grows_with_depth(app, photo):
 
 
 def test_the_shipped_example_assets_exist(app):
-    for path in [app.EXAMPLE_CLIP, *app.EXAMPLE_COMPARE, *(p for p, _ in app.EXAMPLE_LEVELS)]:
+    for path in [app.EXAMPLE_CLIP, *(p for p, _ in app.EXAMPLE_LEVELS)]:
         assert os.path.getsize(path) > 1000, path
     assert [label for _, label in app.EXAMPLE_LEVELS] == ["input", "4x", "16x", "64x", "256x"]
 
 
+def test_labels_cover_every_depth_the_slider_offers(app):
+    got = [app.label(app.UPSCALE ** n) for n in range(app.MAX_STEPS + 1)]
+    assert got[0] == "input"
+    assert got[-1] == "65536x"
+
+
+def test_the_citation_is_the_one_from_the_readme(app):
+    readme = open(os.path.join(os.path.dirname(app.__file__), "..", "README.md")).read()
+    assert "2609.06490" in app.BIBTEX and "dipta2026oraclezoom" in app.BIBTEX
+    for line in app.BIBTEX.splitlines():
+        assert line.strip() in " ".join(readme.split()) or line.strip() in readme, line
+
+
 def test_every_sample_named_for_the_examples_is_present(app):
     for name in app.SAMPLES:
         assert os.path.exists(f"samples/{name}.png")
@@ -73,11 +87,10 @@ def test_every_sample_named_for_the_examples_is_present(app):
 def test_run_streams_one_update_per_level_then_the_clip(app, photo):
     yields = list(app.run(photo, 3, 0.5, 0.5))
     assert len(yields) == 5                       # entry level, 3 zoom steps, then the clip
-    assert all(len(y) == 5 for y in yields)
+    assert all(len(y) == 4 for y in yields)
     assert yields[0][1] is None                   # first yield clears any stale clip
-    status, clip, gallery, compare, prompts = yields[-1]
+    status, clip, gallery, prompts = yields[-1]
     assert [label for _, label in gallery] == ["input", "4x", "16x", "64x"]
-    assert compare is not None and len(compare) == 2
     assert prompts.count("tag") == 3
     try:
         assert os.path.getsize(clip) > 10_000
@@ -85,6 +98,15 @@ def test_run_streams_one_update_per_level_then_the_clip(app, photo):
         os.remove(clip)
 
 
+def test_a_deep_run_labels_every_level(app, photo):
+    status, clip, gallery, prompts = list(app.run(photo, app.MAX_STEPS, 0.5, 0.5))[-1]
+    try:
+        assert [label for _, label in gallery] == [
+            "input", "4x", "16x", "64x", "256x", "1024x", "4096x", "16384x", "65536x"]
+    finally:
+        os.remove(clip)
+
+
 def test_run_rejects_an_empty_upload(app):
     import gradio as gr
     with pytest.raises(gr.Error):