prysm-pulse/beacon-chain/forkchoice/protoarray/no_vote_test.go

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package protoarray
import (
"context"
"testing"
"github.com/prysmaticlabs/prysm/config/params"
"github.com/prysmaticlabs/prysm/testing/assert"
"github.com/prysmaticlabs/prysm/testing/require"
)
func TestNoVote_CanFindHead(t *testing.T) {
balances := make([]uint64, 16)
f := setup(1, 1)
// The head should always start at the finalized block.
r, err := f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
if r != params.BeaconConfig().ZeroHash {
t.Errorf("Incorrect head with genesis")
}
// Insert block 2 into the tree and verify head is at 2:
// 0
// /
// 2 <- head
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(2), params.BeaconConfig().ZeroHash, [32]byte{}, 1, 1))
r, err = f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(2), r, "Incorrect head for with justified epoch at 1")
// Insert block 1 into the tree and verify head is still at 2:
// 0
// / \
// head -> 2 1
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(1), params.BeaconConfig().ZeroHash, [32]byte{}, 1, 1))
r, err = f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(2), r, "Incorrect head for with justified epoch at 1")
// Insert block 3 into the tree and verify head is still at 2:
// 0
// / \
// head -> 2 1
// |
// 3
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(3), indexToHash(1), [32]byte{}, 1, 1))
r, err = f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(2), r, "Incorrect head for with justified epoch at 1")
// Insert block 4 into the tree and verify head is at 4:
// 0
// / \
// 2 1
// | |
// head -> 4 3
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(4), indexToHash(2), [32]byte{}, 1, 1))
r, err = f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(4), r, "Incorrect head for with justified epoch at 1")
// Insert block 5 with justified epoch of 2, verify head is still at 4.
// 0
// / \
// 2 1
// | |
// head -> 4 3
// |
// 5 <- justified epoch = 2
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(5), indexToHash(4), [32]byte{}, 2, 1))
r, err = f.Head(context.Background(), 1, params.BeaconConfig().ZeroHash, balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(4), r, "Incorrect head for with justified epoch at 1")
// Verify there's an error when starting from a block with wrong justified epoch.
// 0
// / \
// 2 1
// | |
// head -> 4 3
// |
// 5 <- starting from 5 with justified epoch 0 should error
_, err = f.Head(context.Background(), 1, indexToHash(5), balances, 1)
wanted := "head at slot 0 with weight 0 is not eligible, finalizedEpoch 1 != 1, justifiedEpoch 2 != 1"
require.ErrorContains(t, wanted, err)
// Set the justified epoch to 2 and start block to 5 to verify head is 5.
// 0
// / \
// 2 1
// | |
// 4 3
// |
// 5 <- head
r, err = f.Head(context.Background(), 2, indexToHash(5), balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(5), r, "Incorrect head for with justified epoch at 2")
// Insert block 6 with justified epoch of 2, verify head is at 6.
// 0
// / \
// 2 1
// | |
// 4 3
// |
// 5
// |
// 6 <- head
require.NoError(t, f.ProcessBlock(context.Background(), 0, indexToHash(6), indexToHash(5), [32]byte{}, 2, 1))
r, err = f.Head(context.Background(), 2, indexToHash(5), balances, 1)
require.NoError(t, err)
assert.Equal(t, indexToHash(6), r, "Incorrect head for with justified epoch at 2")
}