nimbus-eth2/tests/test_state_transition.nim

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# beacon_chain
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
options, sequtils, unittest, chronicles,
./testutil,
../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
../beacon_chain/[extras, state_transition, ssz]
suite "Block processing" & preset():
## For now just test that we can compile and execute block processing with
## mock data.
let
# Genesis state with minimal number of deposits
# TODO bls verification is a bit of a bottleneck here
genesisState = initialize_beacon_state_from_eth1(
Eth2Digest(), 0,
makeInitialDeposits(), {})
genesisBlock = get_initial_beacon_block(genesisState)
genesisRoot = signing_root(genesisBlock)
test "Passes from genesis state, no block" & preset():
var
state = genesisState
process_slots(state, state.slot + 1)
check:
state.slot == genesisState.slot + 1
test "Passes from genesis state, empty block" & preset():
var
state = genesisState
previous_block_root = signing_root(genesisBlock)
new_block = makeBlock(state, previous_block_root, BeaconBlockBody())
let block_ok = state_transition(state, new_block, {})
check:
block_ok
state.slot == genesisState.slot + 1
test "Passes through epoch update, no block" & preset():
var
state = genesisState
process_slots(state, Slot(SLOTS_PER_EPOCH))
check:
state.slot == genesisState.slot + SLOTS_PER_EPOCH
test "Passes through epoch update, empty block" & preset():
var
state = genesisState
previous_block_root = genesisRoot
for i in 1..SLOTS_PER_EPOCH.int:
var new_block = makeBlock(state, previous_block_root, BeaconBlockBody())
let block_ok = state_transition(state, new_block, {})
check:
block_ok
previous_block_root = signing_root(new_block)
check:
state.slot == genesisState.slot + SLOTS_PER_EPOCH
test "Attestation gets processed at epoch" & preset():
var
state = genesisState
previous_block_root = genesisRoot
cache = get_empty_per_epoch_cache()
# Slot 0 is a finalized slot - won't be making attestations for it..
process_slots(state, state.slot + 1)
let
# Create an attestation for slot 1 signed by the only attester we have!
crosslink_committee =
get_crosslink_committee(state, compute_epoch_of_slot(state.slot), 0, cache)
attestation = makeAttestation(
state, previous_block_root, crosslink_committee[0])
# Some time needs to pass before attestations are included - this is
# to let the attestation propagate properly to interested participants
process_slots(state, GENESIS_SLOT + MIN_ATTESTATION_INCLUSION_DELAY + 1)
let
new_block = makeBlock(state, previous_block_root, BeaconBlockBody(
attestations: @[attestation]
))
discard state_transition(state, new_block, {})
check:
# TODO epoch attestations can get multiplied now; clean up paths to
# enable exact 1-check again and keep finalization.
state.current_epoch_attestations.len >= 1
process_slots(state, Slot(191))
# Would need to process more epochs for the attestation to be removed from
# the state! (per above bug)
#
# check:
# state.latest_attestations.len == 0