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FIX: assert the hierarchy budget halt structurally instead of by wall clock #3688

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Manohar Paturi (ManoharPaturi) wants to merge 2 commits into from
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FIX: assert the hierarchy budget halt structurally instead of by wall clock #3688

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FIX: assert the hierarchy budget halt structurally instead of by wall…
ManoharPaturi Oct 31, 2026
fc223cd
Merge branch 'main' into fix/hierarchy-timing-flake
ManoharPaturi Oct 31, 2026
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15 changes: 9 additions & 6 deletions tests/unit/backend/test_scenario_hierarchy_parity.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1200,7 +1200,15 @@ def test_hierarchy_repeated_attempt_diagnostic_retries_consistency() -> None:


def test_hierarchy_traversal_halts_immediately_on_budget_exhaustion() -> None:
"""Test that with 1,000 root results and max_nodes=1, traversal stops immediately without quadratic loop."""
"""Test that with 1,000 root results and max_nodes=1, traversal stops immediately.

The halt is asserted structurally: exactly one node is projected, truncation
is flagged, and the aggregate total stays exact. A wall clock bound was
removed because a 0.05 second budget failed on contended CI runners by a few
milliseconds while the identical code passed in between runs, and the node
count already proves the traversal did not walk the remaining roots. See
issue #3671 for the failing run evidence.
"""
deltas = [
_make_test_delta(
attack_result_id=f"root-{i}",
Expand All @@ -1214,9 +1222,6 @@ def test_hierarchy_traversal_halts_immediately_on_budget_exhaustion() -> None:

snapshot = _make_test_snapshot(deltas=deltas)

import time

start_time = time.perf_counter()
projection = ScenarioProgressReadModel.build_scenario_hierarchy(
scenario_result_id="scenario-run-1",
scenario_name="TestScenario",
Expand All @@ -1225,9 +1230,7 @@ def test_hierarchy_traversal_halts_immediately_on_budget_exhaustion() -> None:
snapshot=snapshot,
max_nodes=1,
)
elapsed = time.perf_counter() - start_time

assert elapsed < 0.05, f"Expected <0.05s, got {elapsed:.4f}s"
assert projection.truncated is True
# Count total nodes in projection
node_count = sum(len(g.roots) for g in projection.groups)
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