diff --git a/tests/core/pyspec/eth2spec/test/phase0/sanity/test_blocks_random.py b/tests/core/pyspec/eth2spec/test/phase0/sanity/test_blocks_random.py
index 05ae545b8..cead514a5 100644
--- a/tests/core/pyspec/eth2spec/test/phase0/sanity/test_blocks_random.py
+++ b/tests/core/pyspec/eth2spec/test/phase0/sanity/test_blocks_random.py
@@ -233,7 +233,10 @@ def _generate_randomized_scenarios():
     rng = Random(1336)
 
     # go forward 0 or 1 epochs
-    epochs_set = (_epoch_transition(n=0), _epoch_transition(n=1))
+    epochs_set = (
+        _epoch_transition(n=0),
+        _epoch_transition(n=1),
+    )
     # within those epochs, go forward to:
     slots_set = (
         # the first slot in an epoch (see note in docstring about offsets...)
@@ -253,7 +256,10 @@ def _generate_randomized_scenarios():
 
     # and preface each block transition with the possible leak transitions
     # (... either no leak or transition to a leak before applying the block transition)
-    leak_transitions = (_no_op_transition, _transition_to_leaking)
+    leak_transitions = (
+        _no_op_transition,
+        _transition_to_leaking,
+    )
     scenarios = [
         {"transitions": list(t)}
         for t in itertools.product(leak_transitions, block_transitions)