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55 lines
2.2 KiB
Python
55 lines
2.2 KiB
Python
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import numpy as np
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from tsi_sim.blocktree import build_tree
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from tsi_sim.latency import FixedSlotLatency
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def _winners(*groups):
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return [np.array(g, dtype=np.int64) for g in groups]
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def test_latency_induces_fork_and_longest_chain():
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# L=2. slot0: node0; slot1: node1 (can't see block1 yet -> forks on genesis);
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# slot3: node2 (sees both, builds on the earlier-slot tip -> block1).
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active = np.array([0, 1, 3], dtype=np.int64)
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winners = _winners([0], [1], [2])
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tree = build_tree(active, winners, FixedSlotLatency(2), np.random.default_rng(0))
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assert tree.n_blocks == 4 # genesis + 3
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assert tree.height.tolist() == [0, 1, 1, 2]
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# block 3 built on block 1 (earlier slot wins the height-1 tie)
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assert tree.parent[3] == 1
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assert tree.canonical_chain() == [3, 1] # tip-first
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# block 2 is the orphan
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canon = set(tree.canonical_chain())
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orphans = [b for b in range(1, tree.n_blocks) if b not in canon]
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assert orphans == [2]
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def test_same_slot_multiwinner_forks_even_at_zero_latency():
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active = np.array([0, 1], dtype=np.int64)
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winners = _winners([0, 1], [2]) # two winners in slot 0 -> guaranteed fork
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tree = build_tree(active, winners, FixedSlotLatency(0), np.random.default_rng(0))
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# blocks 1 and 2 are siblings at height 1 on genesis
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assert tree.parent[1] == 0 and tree.parent[2] == 0
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assert tree.height[1] == 1 and tree.height[2] == 1
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# block 3 at slot 1 extends one of them (height 2)
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assert tree.height[3] == 2
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assert len(tree.canonical_chain()) == 2
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def test_self_extension_within_latency():
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# A single node winning consecutive slots builds on its own block despite latency.
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active = np.array([0, 1], dtype=np.int64)
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winners = _winners([5], [5])
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tree = build_tree(active, winners, FixedSlotLatency(10), np.random.default_rng(0))
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assert tree.parent[2] == 1 # node 5 self-extends
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assert tree.height.tolist() == [0, 1, 2]
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def test_ancestors():
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active = np.array([0, 1, 2], dtype=np.int64)
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winners = _winners([0], [0], [0]) # one node, clean chain
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tree = build_tree(active, winners, FixedSlotLatency(0), np.random.default_rng(0))
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assert tree.ancestors(3) == [3, 2, 1]
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