diff --git a/tests/test_importer_archive.py b/tests/test_importer_archive.py
index 3b72057..713678b 100644
--- a/tests/test_importer_archive.py
+++ b/tests/test_importer_archive.py
@@ -48,13 +48,31 @@ def _jpeg_bytes(color):
     return buf.getvalue()
 
 
+def _split_bytes(orient):
+    """Structured half/half image — solid colors phash-collapse (distance
+    0); orthogonal splits are distinct only at phash_threshold=0 (see
+    reference-phash-test-images)."""
+    im = Image.new("L", (256, 256), 0)
+    px = im.load()
+    for y in range(256):
+        for x in range(256):
+            if (x / 256 if orient == "v" else y / 256) >= 0.5:
+                px[x, y] = 255
+    buf = io.BytesIO()
+    im.convert("RGB").save(buf, "JPEG")
+    return buf.getvalue()
+
+
 def test_archive_imports_members_and_stores_archive(importer, import_layout):
     import_root, _ = import_layout
+    # Distinct structure + threshold 0 so BOTH members import (solid
+    # colors would phash-collapse; reference-phash-test-images).
+    importer.settings.phash_threshold = 0
     arc = import_root / "Bob" / "set.cbz"
     arc.parent.mkdir(parents=True, exist_ok=True)
     with zipfile.ZipFile(arc, "w") as zf:
-        zf.writestr("a.jpg", _jpeg_bytes((200, 10, 10)))
-        zf.writestr("b.jpg", _jpeg_bytes((10, 200, 10)))
+        zf.writestr("a.jpg", _split_bytes("v"))
+        zf.writestr("b.jpg", _split_bytes("h"))
         zf.writestr("readme.txt", b"hello")
     arc.with_suffix(".cbz.json").write_text(json.dumps(
         {"category": "patreon", "id": "777", "title": "Set"}))
diff --git a/tests/test_provenance_service.py b/tests/test_provenance_service.py
index 5cdbf60..7cc2aed 100644
--- a/tests/test_provenance_service.py
+++ b/tests/test_provenance_service.py
@@ -58,7 +58,9 @@ async def test_for_image_no_provenance_returns_empty_list(db):
     rec = await _seed_image(db)
     svc = ProvenanceService(db)
     payload = await svc.for_image(rec.id)
-    assert payload == {"image_id": rec.id, "provenance": []}
+    assert payload == {
+        "image_id": rec.id, "provenance": [], "attachments": []
+    }
 
 
 @pytest.mark.asyncio