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zeekay
75c971b172
The fix in aa4c375 was correct and unpinned -- reverting it left the suite green, which is the same failure this estate has now hit six times. Two tests close it: an unreadable tip must surface its cause and must not report a first run, and a tip of the wrong width must be refused as corruption rather than rounded down to absence. Restoring the old condition now fails both. The absent-tip half was already covered by TestOpenOnAnEmptyStoreStartsAtGenesisAndSaysSo, so it is not restated here.
63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
// Copyright (C) 2019-2026, Lux Industries Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package chain
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import (
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"errors"
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"testing"
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"github.com/luxfi/database"
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"github.com/stretchr/testify/require"
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)
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// unreadableDB fails the tip read specifically, which is how a dead volume or a
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// closed handle presents: the key is there, the bytes will not come back.
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type unreadableDB struct {
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database.Database
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err error
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short bool
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}
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var errUnreadable = errors.New("volume gone")
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func (d *unreadableDB) Get(key []byte) ([]byte, error) {
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if string(key) == string(tipKey) {
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if d.short {
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return []byte{1, 2, 3}, nil
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}
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return nil, d.err
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}
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return d.Database.Get(key)
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}
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// A chain that cannot read its tip does not know where it is. Reading that
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// failure as "nothing recorded yet" starts a live chain over at genesis and
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// lets it build height 1 on state it cannot see — durably, with the caller
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// told it succeeded. Only ABSENCE means a fresh chain.
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func TestOpenRefusesAnUnreadableTip(t *testing.T) {
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f := newFixture(t)
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require.NoError(t, f.store.Accept(newBlock(1, f.genesis.ID(), 1)))
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// The same database, reopened behind a handle that cannot answer for the tip.
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broken := New[*testBlock](&unreadableDB{Database: f.base, err: errUnreadable}, nil)
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_, fresh, err := broken.Open(f.genesis, f.parse)
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require.ErrorIs(t, err, errUnreadable, "the cause must survive the wrap")
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require.False(t, fresh, "an unreadable tip is not a first run")
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}
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// A tip of the wrong width is corruption, not absence. Rounding it down to a
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// fresh chain would discard a live chain because one field was damaged.
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func TestOpenRefusesAWrongWidthTip(t *testing.T) {
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f := newFixture(t)
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require.NoError(t, f.store.Accept(newBlock(1, f.genesis.ID(), 1)))
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broken := New[*testBlock](&unreadableDB{Database: f.base, short: true}, nil)
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_, fresh, err := broken.Open(f.genesis, f.parse)
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require.Error(t, err)
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require.ErrorContains(t, err, "want")
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require.False(t, fresh)
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}
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