Kjell Tore Guttormsen
47147e5f7c
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0145ZKPLMVeqM47z2jxxokym
45 lines
2.4 KiB
Python
45 lines
2.4 KiB
Python
"""S3.6 costsim (kostnadssimulering) — offline, MAF-free, deterministic load-bearing seams.
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``costsim`` estimates token/cost for a portfolio run BEFORE running (what-if over the model-map ×
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effort levels), with pricing as schema-validated config. It is MAF-free (reads ``model_map.json`` as
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plain data via ``__file__``-relative path, never imports ``backends``/``budget``/``contracts``) —
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proven load-bearing by BOTH the direct-import AST guard (``test_okf_is_maf_free`` covering
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``costsim.py``) AND the transitive import-graph seam below.
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"""
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from __future__ import annotations
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import subprocess
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import sys
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from pathlib import Path
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_COSTSIM = Path(__file__).resolve().parents[1] / "src" / "portfolio_optimiser" / "costsim.py"
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def test_costsim_registered_maf_free() -> None:
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"""Meta: costsim.py is registered in the MAF-free guard list, so ``test_okf_is_maf_free``
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actually scans it — otherwise the MAF-free claim would be green-but-dead (never checked)."""
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from tests.test_okf import _MAF_FREE_MODULES
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assert "costsim.py" in _MAF_FREE_MODULES
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def test_costsim_import_is_maf_free() -> None:
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"""The genuine transitive-import seam: loading costsim.py's module body in ISOLATION must NOT
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pull ``agent_framework``/``mcp`` into ``sys.modules``. Loaded standalone via
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``spec_from_file_location`` — NOT as ``portfolio_optimiser.costsim``, since the package
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``__init__`` imports MAF-bound ``run``/``contracts`` and would mask costsim's own cleanliness.
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The AST guard (``test_okf_is_maf_free``) only catches DIRECT imports; a transitive
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``from portfolio_optimiser.contracts import ...`` in costsim would slip past it but trip THIS
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check — ``exec_module`` runs costsim's import statements, so any MAF-bound import lands
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``agent_framework`` in ``sys.modules``. Detach point: add such an import → RED."""
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check = (
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"import importlib.util, sys\n"
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f"spec = importlib.util.spec_from_file_location('costsim_standalone', {str(_COSTSIM)!r})\n"
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"mod = importlib.util.module_from_spec(spec)\n"
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"spec.loader.exec_module(mod)\n"
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"assert 'agent_framework' not in sys.modules, 'agent_framework leaked into costsim import graph'\n"
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"assert 'mcp' not in sys.modules, 'mcp leaked into costsim import graph'\n"
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)
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result = subprocess.run([sys.executable, "-c", check], capture_output=True, text=True)
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assert result.returncode == 0, result.stderr
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