[verified] generalize B1 response regions and marks gap fill

tests/test_docling_regions.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from PIL import Image, ImageDraw
 
+from api.services.docling import extract
 from api.services.docling.regions import detect_response_regions_from_image
 
 
@@ -37,3 +38,46 @@ def test_detects_answer_box() -> None:
     assert boxes
     assert boxes[0]["bbox"]["w"] > 600
     assert boxes[0]["bbox"]["h"] > 200
+
+
+def test_detect_response_region_taxonomy_for_lines_and_boxes():
+    img = Image.new("RGB", (800, 1000), "white")
+    draw = ImageDraw.Draw(img)
+    for y in (220, 260, 300):
+        draw.line((120, y, 680, y), fill="black", width=2)
+    draw.rectangle((140, 520, 660, 640), outline="black", width=3)
+
+    regions = detect_response_regions_from_image(img, min_confidence=0.1)
+    types = {r.region_type for r in regions}
+
+    assert "answer_lines" in types
+    assert "answer_box" in types
+
+
+def test_attach_detected_response_regions_normalizes_taxonomy_and_uses_pdf_y(monkeypatch, tmp_path):
+    pdf = tmp_path / "paper.pdf"
+    pdf.write_bytes(b"%PDF test placeholder")
+    parts = {
+        "01.1": {"q": "01", "page": 1, "bbox": {"l": 50, "r": 80, "t": 700, "b": 680}, "regions": []},
+        "01.2": {"q": "01", "page": 1, "bbox": {"l": 50, "r": 80, "t": 500, "b": 480}, "regions": []},
+    }
+
+    def fake_detect(path, min_confidence=0.32):
+        return [{
+            "page_index": 0,
+            "region_type": "answer-box",
+            "confidence": 0.77,
+            "bbox": {"x": 100, "y": 335, "w": 500, "h": 40},
+            "detection_method": "test",
+            "meta": {"page_height_px": 1000, "page_height_pdf": 800},
+        }]
+
+    monkeypatch.setattr(extract.region_mod, "detect_response_regions_from_pdf", fake_detect)
+
+    attached, candidates = extract.attach_detected_response_regions(parts, str(pdf))
+
+    assert attached == 1
+    assert len(candidates) == 1
+    assert parts["01.1"]["regions"] == []
+    assert parts["01.2"]["regions"][0]["type"] == "answer_box"
+    assert parts["01.2"]["regions"][0]["source"] == "opencv"