diff --git a/swh/loader/package/nixguix/tests/test_nixguix.py b/swh/loader/package/nixguix/tests/test_nixguix.py
--- a/swh/loader/package/nixguix/tests/test_nixguix.py
+++ b/swh/loader/package/nixguix/tests/test_nixguix.py
@@ -59,7 +59,23 @@
         (TargetType.REVISION, b"evaluation")
     ],
 ):
-    return check_snapshot_full(snapshot, storage, allowed_empty)
+    check_snapshot_full(snapshot, storage, allowed_empty)
+
+    assert isinstance(snapshot, Snapshot)
+    # then ensure the snapshot revisions are structurally as expected
+    revision_ids = []
+    for name, branch in snapshot.branches.items():
+        if name == b"evaluation":
+            continue  # skipping that particular branch
+        if branch.target_type == TargetType.REVISION:
+            revision_ids.append(branch.target)
+
+    revisions = storage.revision_get(revision_ids)
+    for rev in revisions:
+        metadata = rev["metadata"]
+        raw = metadata["extrinsic"]["raw"]
+        assert "url" in raw
+        assert "integrity" in raw
 
 
 def test_retrieve_sources(swh_config, requests_mock_datadir):
@@ -119,25 +135,6 @@
     assert len(clean["sources"]) == 1
 
 
-def check_snapshot_revisions_ok(snapshot: Snapshot, storage: StorageInterface):
-    """Ensure the snapshot revisions are structurally as expected
-
-    """
-    revision_ids = []
-    for name, branch in snapshot.branches.items():
-        if name == b"evaluation":
-            continue  # skipping that particular branch
-        if branch.target_type == TargetType.REVISION:
-            revision_ids.append(branch.target)
-
-    revisions = storage.revision_get(revision_ids)
-    for rev in revisions:
-        metadata = rev["metadata"]
-        raw = metadata["extrinsic"]["raw"]
-        assert "url" in raw
-        assert "integrity" in raw
-
-
 def test_loader_one_visit(swh_config, requests_mock_datadir):
     loader = NixGuixLoader(sources_url)
     res = loader.load()
@@ -206,7 +203,6 @@
     )
 
     check_snapshot(SNAPSHOT1, storage=loader.storage)
-    check_snapshot_revisions_ok(SNAPSHOT1, loader.storage)
 
     urls = [
         m.url
@@ -241,7 +237,6 @@
     )
 
     check_snapshot(SNAPSHOT1, storage=loader.storage)
-    check_snapshot_revisions_ok(SNAPSHOT1, loader.storage)
 
     stats = get_stats(loader.storage)
     assert {
@@ -294,7 +289,6 @@
         },
     )
     check_snapshot(expected_snapshot, storage=loader.storage)
-    check_snapshot_revisions_ok(expected_snapshot, loader.storage)
 
     stats = get_stats(loader.storage)
     assert {
@@ -338,7 +332,6 @@
     )
 
     check_snapshot(SNAPSHOT1, storage=loader.storage)
-    check_snapshot_revisions_ok(SNAPSHOT1, loader.storage)
 
 
 def test_eoferror(swh_config, requests_mock_datadir):
@@ -364,7 +357,6 @@
     )
 
     check_snapshot(expected_snapshot, storage=loader.storage)
-    check_snapshot_revisions_ok(expected_snapshot, loader.storage)
 
 
 def fake_download(
@@ -400,7 +392,6 @@
     }
 
     check_snapshot(SNAPSHOT1, storage=loader.storage)
-    check_snapshot_revisions_ok(SNAPSHOT1, loader.storage)
 
     assert len(mock_download.mock_calls) == 2