Add auditable SAM roof label refinement

backend/tests/test_regional_yolo_dataset.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import importlib.util
+from pathlib import Path
+
+
+SCRIPT = Path(__file__).parents[2] / "scripts" / "build_regional_yolo_dataset.py"
+SPEC = importlib.util.spec_from_file_location("regional_yolo_dataset", SCRIPT)
+assert SPEC and SPEC.loader
+MODULE = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(MODULE)
+
+
+def test_select_paths_is_region_and_split_safe() -> None:
+    manifest = {
+        "samples": [
+            {"sample_slug": "f-train", "region": "flanders", "split": "train"},
+            {"sample_slug": "f-val", "region": "flanders", "split": "val"},
+            {"sample_slug": "f-test", "region": "flanders", "split": "test"},
+            {"sample_slug": "w-train", "region": "wallonia", "split": "train"},
+        ]
+    }
+    summary = {
+        "tiles": [
+            {"sample_slug": "f-train", "split": "train", "image_path": "/f-train.png"},
+            {"sample_slug": "f-val", "split": "val", "image_path": "/f-val.png"},
+            {"sample_slug": "f-test", "split": "val", "image_path": "/f-test.png"},
+            {"sample_slug": "w-train", "split": "train", "image_path": "/w-train.png"},
+        ]
+    }
+    train, val = MODULE.select_paths(summary, manifest, "flanders")
+    assert train == ["/f-train.png"]
+    assert val == ["/f-val.png"]