fix: formatting (black)

backend/tests/test_network_service.py

@@ -50,8 +50,7 @@ def test_network_snapshot_prefers_repository_data(
     track = sample_entities["track"]
     train = sample_entities["train"]
 
-    monkeypatch.setattr(StationRepository, "list_active",
-                        lambda self: [station])
+    monkeypatch.setattr(StationRepository, "list_active", lambda self: [station])
     monkeypatch.setattr(TrackRepository, "list_all", lambda self: [track])
     monkeypatch.setattr(TrainRepository, "list_all", lambda self: [train])
 
@@ -59,8 +58,7 @@ def test_network_snapshot_prefers_repository_data(
 
     assert snapshot["stations"]
     assert snapshot["stations"][0]["name"] == station.name
-    assert snapshot["tracks"][0]["lengthMeters"] == pytest.approx(
-        track.length_meters)
+    assert snapshot["tracks"][0]["lengthMeters"] == pytest.approx(track.length_meters)
     assert snapshot["trains"][0]["designation"] == train.designation
     assert snapshot["trains"][0]["operatingTrackIds"] == []
 
@@ -76,5 +74,4 @@ def test_network_snapshot_falls_back_when_repositories_empty(
 
     assert snapshot["stations"]
     assert snapshot["trains"]
-    assert any(station["name"] ==
-               "Central" for station in snapshot["stations"])
+    assert any(station["name"] == "Central" for station in snapshot["stations"])