diff --git a/tests/validation/multigrid/test_block_stepper.py b/tests/validation/multigrid/test_block_stepper.py
index 2206cc9..440193e 100644
--- a/tests/validation/multigrid/test_block_stepper.py
+++ b/tests/validation/multigrid/test_block_stepper.py
@@ -129,6 +129,8 @@ class CpuContracts(unittest.TestCase):
                         (None, dict(coarse_boundary="slot_reservoir")),
                         (config(collision="MRT"), {}),
                         (None, dict(observe_raw_exchange=True)),
+                        (None, dict(observe_raw_exchange=True, observe_window_exchange=True)),
+                        (config(les_enabled=True), {}),
                         (None, dict(level_jets=[(object(),)])),
                         (None, dict(explosion="projected_linear")),
                         (None, dict(level_objects=[(circle((15.5, 4.0), 4.3),)]))):  # touches edge