Report blank YOLO label QA tiles

backend/tests/test_docker_runtime_config.py

@@ -68,6 +68,18 @@ def test_all_in_one_dockerfile_copies_operator_scripts_for_runtime_use() -> None
     assert "COPY scripts/train_operator_yolo_detector.sh /app/scripts/train_operator_yolo_detector.sh" in dockerfile
 
 
+def test_all_in_one_dockerfile_copies_operator_scripts_after_dependency_install() -> None:
+    dockerfile = (ROOT / "deploy" / "unraid" / "Dockerfile.all-in-one").read_text(encoding="utf-8")
+
+    dependency_install_index = dockerfile.index('RUN /usr/bin/python3.11 -m venv /opt/geointel/venv \\')
+    operator_copy_index = dockerfile.index(
+        "COPY scripts/render_operator_yolo_label_qa_contact_sheets.py "
+        "/app/scripts/render_operator_yolo_label_qa_contact_sheets.py"
+    )
+
+    assert operator_copy_index > dependency_install_index
+
+
 def test_compose_does_not_require_missing_root_env_file() -> None:
     compose = (ROOT / "docker-compose.yml").read_text(encoding="utf-8")
 

backend/tests/test_sprint167_operator_yolo_label_qa_contact_sheets.py

@@ -5,12 +5,20 @@ import subprocess
 import sys
 from pathlib import Path
 
-from PIL import Image
+from PIL import Image, ImageDraw
 
 
 ROOT = Path(__file__).resolve().parents[2]
 
 
+def write_patterned_image(path: Path, color: tuple[int, int, int]) -> None:
+    image = Image.new("RGB", (64, 64), color=color)
+    draw = ImageDraw.Draw(image)
+    draw.rectangle((8, 8, 38, 30), fill=(220, 220, 210))
+    draw.line((0, 48, 64, 24), fill=(30, 40, 50), width=4)
+    image.save(path)
+
+
 def test_operator_yolo_label_qa_contact_sheets_render_visual_artifacts(tmp_path: Path) -> None:
     script_path = ROOT / "scripts" / "render_operator_yolo_label_qa_contact_sheets.py"
     assert script_path.exists()
@@ -29,9 +37,9 @@ def test_operator_yolo_label_qa_contact_sheets_render_visual_artifacts(tmp_path:
         (image_train / "dense_000.png", (120, 130, 140)),
         (image_train / "invalid_000.png", (80, 100, 120)),
         (image_val / "missing_000.png", (90, 120, 90)),
-        (image_val / "negative_000.png", (50, 50, 55)),
     ):
-        Image.new("RGB", (64, 64), color=color).save(path)
+        write_patterned_image(path, color)
+    Image.new("RGB", (64, 64), color=(255, 255, 255)).save(image_val / "negative_000.png")
 
     (labels_train / "dense_000.txt").write_text(
         "0 0.500000 0.500000 0.500000 0.500000\n"
@@ -141,12 +149,16 @@ def test_operator_yolo_label_qa_contact_sheets_render_visual_artifacts(tmp_path:
     assert report["rendered_tile_count"] == 4
     assert report["missing_label_file_count"] == 1
     assert report["invalid_label_count"] == 1
+    assert report["low_visual_variance_tile_count"] == 1
     assert [tile["sample_slug"] for tile in report["selected_tiles"]] == [
         "dense",
         "invalid",
         "missing",
         "negative",
     ]
+    tile_by_slug = {tile["sample_slug"]: tile for tile in report["selected_tiles"]}
+    assert tile_by_slug["negative"]["low_visual_variance"] is True
+    assert tile_by_slug["dense"]["low_visual_variance"] is False
 
     sheet_path = output_dir / report["contact_sheets"][0]["path"]
     assert sheet_path.exists()
@@ -159,4 +171,5 @@ def test_operator_yolo_label_qa_contact_sheets_render_visual_artifacts(tmp_path:
     assert "Operator YOLO Label QA Contact Sheets" in markdown
     assert "missing label files: 1" in markdown
     assert "invalid label rows: 1" in markdown
+    assert "low-variance rendered tiles: 1" in markdown
     assert "contact_sheet_001.png" in markdown