3086e9a4d9
Integrate Gemini ADR-0242 implementation with adversarial hardening: CGA null-point separation pin (d_min=0.12), fail-closed Fibonacci search with fixed budget and unimodality checks, serve quarantine still held, ADR-0242 Proposed (not pre-accepted), fidelity ledger flip to green.
77 lines
1.9 KiB
Python
77 lines
1.9 KiB
Python
"""ADR-0242 — Fibonacci section search behavioral pins."""
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from __future__ import annotations
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import pytest
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from core.physics.fibonacci_search import (
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BoundedUnimodalObjective,
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fibonacci_section_search,
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)
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def test_fibonacci_search_hits_known_unimodal_min_within_1e_3():
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objective = BoundedUnimodalObjective(
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lower=0.1,
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upper=2.0,
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evaluation_budget=20,
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objective_id="test_id",
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objective_version="v1",
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)
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def func(x: float) -> float:
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return (x - 0.789) ** 2
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trace = fibonacci_section_search(objective, func)
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assert abs(trace.best_observed_point - 0.789) < 1e-3
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assert len(trace.eval_sequence) == 20
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def test_fibonacci_search_eval_count_equals_budget():
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objective = BoundedUnimodalObjective(
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lower=-5.0,
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upper=5.0,
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evaluation_budget=15,
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objective_id="test_id2",
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objective_version="v1",
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)
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def func(x: float) -> float:
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return x**2
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trace = fibonacci_section_search(objective, func)
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assert len(trace.eval_sequence) == 15
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assert trace.certificate["n_evals"] == 15
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def test_fibonacci_search_rejects_nan_objective():
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objective = BoundedUnimodalObjective(
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lower=-1.0,
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upper=1.0,
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evaluation_budget=10,
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objective_id="nan",
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objective_version="v1",
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)
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def func(x: float) -> float:
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return float("nan")
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with pytest.raises(ValueError, match="nonfinite"):
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fibonacci_section_search(objective, func)
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def test_fibonacci_search_unimodality_violation_fail_closed():
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objective = BoundedUnimodalObjective(
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lower=-2.0,
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upper=2.0,
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evaluation_budget=10,
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objective_id="multi",
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objective_version="v1",
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)
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def func(x: float) -> float:
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# Multiple extrema: x^4 - x^2
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return x**4 - x**2
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with pytest.raises(ValueError, match="unimodality"):
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fibonacci_section_search(objective, func)
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