d456b8be9b
Reads stored block timestamps and cumulative difficulties, calls difficulty.NextDifficulty() with config.BlockTarget. Returns uint64. Adds getBlockMeta() for lightweight metadata-only lookups. Co-Authored-By: Charon <charon@lethean.io>
71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package chain
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import (
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"testing"
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store "forge.lthn.ai/core/go-store"
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"forge.lthn.ai/core/go-blockchain/types"
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"github.com/stretchr/testify/require"
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)
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func TestNextDifficulty_Genesis(t *testing.T) {
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s, err := store.New(":memory:")
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require.NoError(t, err)
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defer s.Close()
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c := New(s)
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diff, err := c.NextDifficulty(0)
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require.NoError(t, err)
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require.Equal(t, uint64(1), diff)
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}
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func TestNextDifficulty_FewBlocks(t *testing.T) {
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s, err := store.New(":memory:")
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require.NoError(t, err)
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defer s.Close()
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c := New(s)
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// Store 5 blocks with constant 120s intervals and difficulty 1000.
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baseDiff := uint64(1000)
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for i := uint64(0); i < 5; i++ {
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err := c.PutBlock(&types.Block{}, &BlockMeta{
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Hash: types.Hash{byte(i + 1)},
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Height: i,
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Timestamp: i * 120,
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Difficulty: baseDiff,
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CumulativeDiff: baseDiff * (i + 1),
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})
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require.NoError(t, err)
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}
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// Next difficulty for height 5 should be approximately 1000.
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diff, err := c.NextDifficulty(5)
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require.NoError(t, err)
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require.Greater(t, diff, uint64(0))
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// With constant intervals at target, difficulty should be close to base.
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// Allow 10% tolerance.
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low := baseDiff - baseDiff/10
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high := baseDiff + baseDiff/10
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require.GreaterOrEqual(t, diff, low, "difficulty %d below expected range [%d, %d]", diff, low, high)
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require.LessOrEqual(t, diff, high, "difficulty %d above expected range [%d, %d]", diff, low, high)
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}
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func TestNextDifficulty_EmptyChain(t *testing.T) {
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s, err := store.New(":memory:")
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require.NoError(t, err)
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defer s.Close()
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c := New(s)
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// Height 1 with no blocks stored — should return starter difficulty.
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diff, err := c.NextDifficulty(1)
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require.NoError(t, err)
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require.Equal(t, uint64(1), diff)
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}
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