def build_attestation_data(state, slot, shard):
assert state.slot >= slot
block_root = build_empty_block_for_next_slot(state).previous_block_root
epoch_start_slot = get_epoch_start_slot(get_current_epoch(state))
if epoch_start_slot == slot:
epoch_boundary_root = block_root
else:
get_block_root(state, epoch_start_slot)
if slot < epoch_start_slot:
justified_block_root = state.previous_justified_root
else:
justified_block_root = state.current_justified_root
return AttestationData(
slot=slot,
shard=shard,
beacon_block_root=block_root,
source_epoch=state.current_justified_epoch,
source_root=justified_block_root,
target_root=epoch_boundary_root,
crosslink_data_root=spec.ZERO_HASH,
previous_crosslink=deepcopy(state.latest_crosslinks[shard]),
)
def test_empty_block_transition(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
state_transition(test_state, block)
assert len(test_state.eth1_data_votes) == len(state.eth1_data_votes) + 1
assert get_block_root(test_state, state.slot) == block.previous_block_root
return state, [block], test_state
def test_empty_epoch_transition(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
block.slot += spec.SLOTS_PER_EPOCH
state_transition(test_state, block)
assert test_state.slot == block.slot
for slot in range(state.slot, test_state.slot):
assert get_block_root(test_state, slot) == block.previous_block_root
return state, [block], test_state
def test_skipped_slots(state):
test_state = deepcopy(state)
block = build_empty_block_for_next_slot(test_state)
block.slot += 3
state_transition(test_state, block)
assert test_state.slot == block.slot
for slot in range(state.slot, test_state.slot):
assert get_block_root(test_state, slot) == block.previous_block_root
return state, [block], test_state