Remove the duplicate get_head unit test
This commit is contained in:
Hsiao-Wei Wang
parent
23b28b62d0
commit
d29926efe6
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from eth2spec.test.context import with_all_phases, spec_state_test
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from eth2spec.test.helpers.attestations import get_valid_attestation, next_epoch_with_attestations
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from eth2spec.test.helpers.block import build_empty_block_for_next_slot
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from eth2spec.test.helpers.fork_choice import (
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add_attestation_to_store,
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add_block_to_store, get_anchor_root,
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get_genesis_forkchoice_store,
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)
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from eth2spec.test.helpers.state import (
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next_epoch,
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state_transition_and_sign_block,
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)
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@with_all_phases
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@spec_state_test
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def test_genesis(spec, state):
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# Initialization
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store = get_genesis_forkchoice_store(spec, state)
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anchor_root = get_anchor_root(spec, state)
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assert spec.get_head(store) == anchor_root
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@with_all_phases
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@spec_state_test
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def test_chain_no_attestations(spec, state):
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# Initialization
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store = get_genesis_forkchoice_store(spec, state)
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anchor_root = get_anchor_root(spec, state)
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assert spec.get_head(store) == anchor_root
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# On receiving a block of `GENESIS_SLOT + 1` slot
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block_1 = build_empty_block_for_next_slot(spec, state)
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signed_block_1 = state_transition_and_sign_block(spec, state, block_1)
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add_block_to_store(spec, store, signed_block_1)
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# On receiving a block of next epoch
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block_2 = build_empty_block_for_next_slot(spec, state)
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signed_block_2 = state_transition_and_sign_block(spec, state, block_2)
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add_block_to_store(spec, store, signed_block_2)
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assert spec.get_head(store) == spec.hash_tree_root(block_2)
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@with_all_phases
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@spec_state_test
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def test_split_tie_breaker_no_attestations(spec, state):
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genesis_state = state.copy()
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# Initialization
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store = get_genesis_forkchoice_store(spec, state)
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anchor_root = get_anchor_root(spec, state)
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assert spec.get_head(store) == anchor_root
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# block at slot 1
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block_1_state = genesis_state.copy()
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block_1 = build_empty_block_for_next_slot(spec, block_1_state)
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signed_block_1 = state_transition_and_sign_block(spec, block_1_state, block_1)
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add_block_to_store(spec, store, signed_block_1)
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# additional block at slot 1
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block_2_state = genesis_state.copy()
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block_2 = build_empty_block_for_next_slot(spec, block_2_state)
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block_2.body.graffiti = b'\x42' * 32
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signed_block_2 = state_transition_and_sign_block(spec, block_2_state, block_2)
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add_block_to_store(spec, store, signed_block_2)
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highest_root = max(spec.hash_tree_root(block_1), spec.hash_tree_root(block_2))
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assert spec.get_head(store) == highest_root
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@with_all_phases
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@spec_state_test
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def test_shorter_chain_but_heavier_weight(spec, state):
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genesis_state = state.copy()
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# Initialization
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store = get_genesis_forkchoice_store(spec, state)
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anchor_root = get_anchor_root(spec, state)
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assert spec.get_head(store) == anchor_root
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# build longer tree
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long_state = genesis_state.copy()
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for _ in range(3):
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long_block = build_empty_block_for_next_slot(spec, long_state)
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signed_long_block = state_transition_and_sign_block(spec, long_state, long_block)
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add_block_to_store(spec, store, signed_long_block)
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# build short tree
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short_state = genesis_state.copy()
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short_block = build_empty_block_for_next_slot(spec, short_state)
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short_block.body.graffiti = b'\x42' * 32
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signed_short_block = state_transition_and_sign_block(spec, short_state, short_block)
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add_block_to_store(spec, store, signed_short_block)
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short_attestation = get_valid_attestation(spec, short_state, short_block.slot, signed=True)
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add_attestation_to_store(spec, store, short_attestation)
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assert spec.get_head(store) == spec.hash_tree_root(short_block)
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@with_all_phases
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@spec_state_test
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def test_filtered_block_tree(spec, state):
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# Initialization
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store = get_genesis_forkchoice_store(spec, state)
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anchor_root = get_anchor_root(spec, state)
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# transition state past initial couple of epochs
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next_epoch(spec, state)
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next_epoch(spec, state)
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assert spec.get_head(store) == anchor_root
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# fill in attestations for entire epoch, justifying the recent epoch
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prev_state, signed_blocks, state = next_epoch_with_attestations(spec, state, True, False)
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attestations = [
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attestation for signed_block in signed_blocks
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for attestation in signed_block.message.body.attestations
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]
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assert state.current_justified_checkpoint.epoch > prev_state.current_justified_checkpoint.epoch
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# tick time forward and add blocks and attestations to store
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current_time = state.slot * spec.SECONDS_PER_SLOT + store.genesis_time
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spec.on_tick(store, current_time)
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for signed_block in signed_blocks:
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spec.on_block(store, signed_block)
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for attestation in attestations:
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spec.on_attestation(store, attestation)
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assert store.justified_checkpoint == state.current_justified_checkpoint
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# the last block in the branch should be the head
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expected_head_root = spec.hash_tree_root(signed_blocks[-1].message)
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assert spec.get_head(store) == expected_head_root
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#
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# create branch containing the justified block but not containing enough on
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# chain votes to justify that block
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#
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# build a chain without attestations off of previous justified block
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non_viable_state = store.block_states[store.justified_checkpoint.root].copy()
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# ensure that next wave of votes are for future epoch
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next_epoch(spec, non_viable_state)
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next_epoch(spec, non_viable_state)
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next_epoch(spec, non_viable_state)
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assert spec.get_current_epoch(non_viable_state) > store.justified_checkpoint.epoch
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# create rogue block that will be attested to in this non-viable branch
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rogue_block = build_empty_block_for_next_slot(spec, non_viable_state)
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signed_rogue_block = state_transition_and_sign_block(spec, non_viable_state, rogue_block)
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# create an epoch's worth of attestations for the rogue block
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next_epoch(spec, non_viable_state)
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attestations = []
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for i in range(spec.SLOTS_PER_EPOCH):
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slot = rogue_block.slot + i
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for index in range(spec.get_committee_count_per_slot(non_viable_state, spec.compute_epoch_at_slot(slot))):
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attestation = get_valid_attestation(spec, non_viable_state, slot, index, signed=True)
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attestations.append(attestation)
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# tick time forward to be able to include up to the latest attestation
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current_time = (attestations[-1].data.slot + 1) * spec.SECONDS_PER_SLOT + store.genesis_time
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spec.on_tick(store, current_time)
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# include rogue block and associated attestations in the store
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spec.on_block(store, signed_rogue_block)
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for attestation in attestations:
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spec.on_attestation(store, attestation)
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# ensure that get_head still returns the head from the previous branch
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assert spec.get_head(store) == expected_head_root
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