Merge pull request ethereum#3571 from etan-status/lc-periodhelpers

Extract sync committee period <-> slot helpers to common LC test module

tests/core/pyspec/eth2spec/test/altair/light_client/test_sync.py

@@ -28,6 +28,7 @@
     is_post_fork,
 )
 from eth2spec.test.helpers.light_client import (
+    compute_start_slot_at_next_sync_committee_period,
     get_sync_aggregate,
     upgrade_lc_bootstrap_to_new_spec,
     upgrade_lc_update_to_new_spec,
@@ -196,15 +197,6 @@ def emit_upgrade_store(test, new_s_spec, phases=None):
     })
 
 
-def compute_start_slot_at_sync_committee_period(spec, sync_committee_period):
-    return spec.compute_start_slot_at_epoch(sync_committee_period * spec.EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
-
-
-def compute_start_slot_at_next_sync_committee_period(spec, state):
-    sync_committee_period = spec.compute_sync_committee_period_at_slot(state.slot)
-    return compute_start_slot_at_sync_committee_period(spec, sync_committee_period + 1)
-
-
 @with_light_client
 @spec_state_test_with_matching_config
 @with_presets([MINIMAL], reason="too slow")

tests/core/pyspec/eth2spec/test/helpers/light_client.py

@@ -11,6 +11,15 @@
 from math import floor
 
 
+def compute_start_slot_at_sync_committee_period(spec, sync_committee_period):
+    return spec.compute_start_slot_at_epoch(sync_committee_period * spec.EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
+
+
+def compute_start_slot_at_next_sync_committee_period(spec, state):
+    sync_committee_period = spec.compute_sync_committee_period_at_slot(state.slot)
+    return compute_start_slot_at_sync_committee_period(spec, sync_committee_period + 1)
+
+
 def get_sync_aggregate(spec, state, num_participants=None, signature_slot=None):
     # By default, the sync committee signs the previous slot
     if signature_slot is None: