tegwick
db6445ae37
AM-4c is withdrawn from the acceptance table and retained as a reported diagnostic. GameKernel §5a carries the argument. The ratio has no monotone better direction. INTENT's rule is "own the semantics, assimilate the implementation": rising can mean owning semantics properly or reimplementing what should have been assimilated; falling can mean leverage or dependency bloat. A target requires knowing which way is better. It is also redundant — AM-4a/AM-4b bound the denominator and AM-2 bounds own-source density, so AM-4c is a ratio of two already-targeted quantities. Measured at withdrawal: 1,426 own lines per 100k third-party (shipped), 1,107 (dev). make dep-weight now prints both, labelled diagnostic — the row was never actually reported before. M-D1-MUT keeps AM-4c in its denominator on purpose and says so in the output. Dropping it would move the score 7/14 -> 7/13 without enforcing anything: a score improved by deleting the question. Decided before Phase B deliberately, since ADR-0005 predicts own-source growth that will move this ratio; deciding after would be the retarget §Step 4 forbids. A T01 correction found here. The AM-6 gate failed inside `make all` at 38,753 ev/s against 341,280 in isolation — a 9x drop, because cargo test runs binaries and threads concurrently. A throughput assertion inside a parallel harness measures contention, not throughput. T01's measurement was valid; its gate placement was not. Fixed by running it only where valid — #[ignore] plus `make am6` in release with --test-threads=1, now 2.0M ev/s at 20.2x headroom — and not by lowering the target, which T01 forbade. My first attempt did drift that way, adding a debug "sanity floor" of 50,000, and was backed out: a second threshold is still a second chance to tune. The mutation then went SURVIVED on the first run after the move. 4,000 black_box iterations were calibrated against debug's 3.4x headroom and are invisible against release's 20x. Raised to 100,000; back to red. A weak mutation is not a fixed property of a row — it can become weak when the row's measurement conditions change. Tier S (amends one row, creates no capability), chaos d4=2, no override. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
467 lines
22 KiB
Python
467 lines
22 KiB
Python
#!/usr/bin/env python3
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"""M-D1-MUT: does anything fail when an acceptance row's property is false?
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CB-WP-0005 T02, per ADR-0005 §1. Every other instrument in this project
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counts **names** — M-D1-COV counts `covers:` tags, M-D1-LNK counts rule-ID
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strings. Both answer "is this rule mentioned?" Neither answers "does
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anything fail if it is violated?"
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Four of the seven defects found by CB-RES-0004 were named in the source
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and inert. Two were mutation-proven: AM-7's `hash-identical` clause
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survives folding a 100k-event log from an unrelated genesis state, and
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K9's `through` field survives `Snapshot::take` discarding it.
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So: for each acceptance row in `specs/GameKernel.md` §5, invert the
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property and require the verifying command to go **red**.
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adapted:mutation-testing — the denominator is acceptance rows, not
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source lines. Exhaustive tools (cargo-mutants, Stryker, PIT) score a
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kill rate over lines; that is slow and measures something we do not
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claim. Our claims are the AM-* rows, so those are the population.
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## Verdicts
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red baseline green, mutant red — the row is enforced
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SURVIVED baseline green, mutant ALSO green — the row asserts
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nothing; this is the defect being hunted
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unmutatable no property to invert, with a stated reason — **counts
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against** the metric (ADR-0005 §1). A row nobody can
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invert asserts nothing.
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inconclusive baseline already red, so "mutant red" would prove nothing
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## Positive controls
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A mutation harness that silently fails to apply its mutation reports every
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row as green-baseline/green-mutant and looks thorough. So each run
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asserts, per row: the file content actually changed; the baseline command
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passed **before** mutating; and the file was restored afterwards. This
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project has seven harness-does-nothing instances and one was found in
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`rule-coverage.py` an hour ago.
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Usage:
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python3 tools/mutation-check.py # run every row
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python3 tools/mutation-check.py --row AM-1
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python3 tools/mutation-check.py --self-test
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"""
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import argparse
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import os
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import subprocess
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import sys
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from repo import ROOT, cargo_env, enter_root
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CARGO = ["cargo"]
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class Row:
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"""One acceptance row and the mutation that must break it."""
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def __init__(self, id, claim, verify=None, mutate=None, unmutatable=None,
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clauses=None, expect=None):
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self.id = id
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self.claim = claim
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self.verify = verify # command that must be green, then red
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self.mutate = mutate # (relpath, old, new)
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self.unmutatable = unmutatable
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# CB-WP-0005 T08 / the FA class: a mutation is only evidence if it
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# fails FOR ITS STATED REASON. A no-op mutation produces no failure
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# at all, and would otherwise be scored as a genuine SURVIVED —
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# publishing the claim that working code is broken. When `expect`
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# is set, the mutant's output must contain it.
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self.expect = expect
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# A row with several stated clauses is red only if EVERY clause has
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# a mutation that goes red. AM-7 is the reason this exists.
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self.clauses = clauses or []
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def rows():
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"""The acceptance table, with a mutation or a stated reason for none.
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Ordered as in specs/GameKernel.md §5. AM-4 splits into a/b/c, so there
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are **14** rows, not the twelve ADR-0005 asserted — see the
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correction note in the report.
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"""
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py = [sys.executable]
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return [
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Row("AM-1", "100% of GR-rules covered by >=1 passing scenario",
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verify=py + ["tools/rule-coverage.py"],
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mutate=("scenarios/ground/gr-r06-round-resolve.yaml",
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"GR-R06, ", "")),
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# A PROPERTY mutation: inflate the implementation past the ratio.
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# 58 rules x 40 = 2,320; the impl is 1,575, so ~800 lines of filler
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# crosses it. Raising the threshold instead would only prove the
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# comparison runs.
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Row("AM-2", "<= 40 spec lines per rule in games/ground",
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verify=py + ["tools/size-metrics.py"],
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mutate=("games/ground/src/lib.rs",
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"impl Aggregate for GroundState {",
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"fn _am2_filler() {\n" + " let _x = 0;\n" * 800
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+ "}\n\nimpl Aggregate for GroundState {"),
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expect="FAIL target <= 40"),
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Row("AM-3", "synthetic workload definition <= 50 LOC",
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unmutatable="BLOCKED, not uninstrumented — the distinction "
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"matters. `make size-metrics` ships the measurement "
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"(a marker-delimited region) and reports the row "
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"blocked, because the artifact it measures has never "
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"been built: games/ contains only ground, and "
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"benches/synthetic.rs drives GROUND rather than "
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"defining a synthetic game. The baseline is a "
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"declarative 3p commit/reveal game object (~36 LOC, "
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"boardgame.io); measuring GROUND's 1,575 impl lines "
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"against it would compare two different games and "
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"call the difference a D1 result. Still counts "
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"against M-D1-MUT (ADR-0005 §1) — a row that cannot "
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"fail asserts nothing, however good the reason."),
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Row("AM-4a", "third-party LOC, shipped runtime <= 250,000",
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verify=py + ["tools/dep-weight.py"],
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mutate=("tools/dep-weight.py",
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'"shipped-runtime": 250_000,', '"shipped-runtime": 1_000,')),
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Row("AM-4b", "third-party LOC, dev toolchain <= 350,000",
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verify=py + ["tools/dep-weight.py"],
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mutate=("tools/dep-weight.py",
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'"dev-toolchain": 350_000,', '"dev-toolchain": 1_000,')),
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# Deliberately RETAINED in this denominator after its withdrawal
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# from the acceptance table. Dropping it would move M-D1-MUT from
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# 7/14 to 7/13 without enforcing anything — a score improved by
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# deleting the question.
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Row("AM-4c", "own source per third-party 100k lines",
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unmutatable="WITHDRAWN from the acceptance table 2026-08-01 "
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"(CB-WP-0006 T04, GameKernel §5a) and retained here "
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"as a diagnostic. The ratio has no monotone better "
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"direction — rising can mean owning semantics or "
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"reimplementing what should be assimilated; falling "
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"can mean leverage or dependency bloat — so it "
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"cannot carry a threshold. It is also redundant: "
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"AM-4a/AM-4b bound the denominator and AM-2 bounds "
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"own-source density. Kept in this denominator on "
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"purpose, so the metric cannot be improved by "
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"deleting rows."),
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Row("AM-5", "clean release build <= 60 s",
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unmutatable="now RECORDED (`make build-time`) and **breaching**: "
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"87.0 s dev toolchain, 61.3 s shipped runtime, "
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"against a 60 s target on bnt-lap001. Still counts "
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"against M-D1-MUT because GameKernel §5 declares the "
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"row `recorded not gated` — a row that cannot fail "
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"asserts nothing, and promoting it is a spec change "
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"needing an ADR. The breach is a maintainer decision, "
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"not something this tool should resolve by gating "
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"itself."),
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Row("AM-6", ">= 100,000 applied events/s",
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# Release: the gate runs where headroom is ~24x. In debug the
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# test only asserts a sanity floor, so a debug mutation run
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# would need a far larger slowdown to register.
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verify=CARGO + ["test", "--release", "-p", "games-ground",
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"--all-features", "am6_throughput", "--",
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"--ignored", "--test-threads=1"],
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# A PROPERTY mutation, not a threshold tweak: slow the fold hot
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# path and require the gate to notice. Raising the target
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# instead would only prove the comparison runs.
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mutate=("games/ground/src/lib.rs",
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" fn fold(&mut self, event: &Self::Event) {\n"
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" match event {",
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" fn fold(&mut self, event: &Self::Event) {\n"
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" for _ in 0..100_000 { std::hint::black_box(0u8); }\n"
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" match event {"),
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expect="AM-6 UNMET"),
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Row("AM-7", "scaling >= 0.9x, and replay of 100k events <= 5 s, "
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"hash-identical",
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verify=CARGO + ["test", "-p", "games-ground", "--all-features",
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"replay_100k"],
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mutate=("games/ground/src/lib.rs",
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'assert!(elapsed.as_secs_f64() < 5.0,',
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'assert!(elapsed.as_secs_f64() < 0.0,'),
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clauses=[
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("timing <= 5 s", True,
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"the elapsed assert is live; tightening it to 0.0 s goes red"),
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("hash-identical", False,
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"MUTATION-PROVEN SURVIVED: folding from fresh(999) instead "
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"of fresh(42) leaves the test green. The hash reaches only a "
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"println!. It could not be asserted as written anyway — the "
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"log spans games seeded 42, 43, 44..."),
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("scaling >= 0.9x", False,
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"no code computes the ratio of throughput @100k to @5k or "
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"compares it to 0.9; Criterion reports both and nothing "
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"relates them."),
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]),
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Row("AM-8", "determinism: same-seed replays bit-identical",
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verify=CARGO + ["run", "-q", "-p", "cb-sim", "--",
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"scenarios/ground/gr-r06-round-resolve.yaml"],
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mutate=("crates/cb-kernel/src/rng.rs",
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"Self(rand_chacha::ChaCha12Rng::seed_from_u64(seed.0))",
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"{ static N: std::sync::atomic::AtomicU64 = "
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"std::sync::atomic::AtomicU64::new(0); "
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"let n = N.fetch_add(1, std::sync::atomic::Ordering::Relaxed); "
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"Self(rand_chacha::ChaCha12Rng::seed_from_u64(seed.0 + n)) }"),
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clauses=[
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("N=10 same-seed replays", False,
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"the runner executes each scenario TWICE (K8), not ten "
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"times; the spec says N=10. The double-run is live and the "
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"count is not."),
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("HashMap deny lint clean", True,
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"clippy.toml denies HashMap/HashSet and `make check` runs "
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"with -D warnings"),
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]),
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# A PROPERTY mutation: make the workload actually use memory.
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Row("AM-9", "peak RSS <= 64 MB",
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verify=py + ["tools/runtime-metrics.py", "--fast"],
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mutate=("games/ground/src/lib.rs",
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" fn replay_100k_events_is_linear_and_fast() {",
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" fn replay_100k_events_is_linear_and_fast() {\n"
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" let hog: Vec<u8> = vec![7u8; 300_000_000];\n"
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" std::hint::black_box(&hog);"),
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expect="FAIL target <= 64 MB"),
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Row("AM-10", "0 foreign types in cb-*-api-visible signatures",
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unmutatable="the population is empty — there is no `cb-*-api` "
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"crate, so the claim is true over nothing. What is "
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"measured instead is a clippy deny of "
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"HashMap/HashSet whose stated reason cites K6 "
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"(determinism), reported under a D4 leak row. "
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"Withdrawn by ADR-0005 §4."),
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Row("AM-11", "null + reference impls passing ONE conformance suite",
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unmutatable="the suite does not exist. `grep -rn conformance` "
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"over every .rs returns one doc comment describing "
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"future work; the RNG pair is exercised by two "
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"separate, non-shared tests. The metric is a bool "
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"over a suite, and the suite is zero. Downgraded to "
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"unmet by ADR-0005 §4; T04 builds the suite."),
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Row("AM-12", "tokens and USD recorded per task",
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verify=py + ["tools/cb-cost.py", "--self-test"],
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mutate=("tools/cb-cost.py",
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'toks["output"] = max(t["output"] for t in per_row)',
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'toks["output"] = per_row[0]["output"]')),
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]
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def run(cmd, timeout=900):
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"""(ok, tail) for one verifying command, run at the repo root."""
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try:
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r = subprocess.run(cmd, cwd=ROOT, env=cargo_env(),
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capture_output=True, text=True, timeout=timeout)
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except subprocess.TimeoutExpired:
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return False, "TIMEOUT", "TIMEOUT"
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out = (r.stdout + r.stderr).strip()
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tail = out.splitlines()
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return r.returncode == 0, (tail[-1][:70] if tail else ""), out
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def check_row(row):
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"""(verdict, detail). Restores the tree even when the command fails."""
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if row.unmutatable:
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return "unmutatable", row.unmutatable
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path = os.path.join(ROOT, row.mutate[0])
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original = open(path).read()
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old, new = row.mutate[1], row.mutate[2]
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# Positive control 1: the mutation must be applicable at all. A
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# find-string that no longer matches would otherwise mutate nothing
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# and report the baseline result as the mutant result.
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if original.count(old) < 1:
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return "HARNESS-BROKEN", (
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f"mutation target not found in {row.mutate[0]}: {old!r}")
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# Positive control 2: the baseline must be green, or "mutant red"
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# proves nothing.
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base_ok, base_tail, _ = run(row.verify)
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if not base_ok:
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return "inconclusive", f"baseline already red: {base_tail}"
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try:
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mutated = original.replace(old, new, 1)
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# Positive control 3: the file content must actually differ.
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if mutated == original:
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return "HARNESS-BROKEN", "replace produced no change"
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open(path, "w").write(mutated)
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if open(path).read() == original:
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return "HARNESS-BROKEN", "write did not take effect"
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mut_ok, mut_tail, mut_out = run(row.verify)
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finally:
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open(path, "w").write(original)
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# Positive control 4: restoration must have worked, or every later
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# row runs against a corrupted tree.
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if open(path).read() != original:
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return "HARNESS-BROKEN", f"failed to restore {row.mutate[0]}"
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if mut_ok:
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return "SURVIVED", "mutant is green — this row asserts nothing"
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if row.expect and row.expect not in mut_out:
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# The FA guard. The mutant went red, but not for the reason
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# claimed — a compile error, a panic elsewhere, an unrelated
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# assertion. Scoring that as `red` would credit the row with an
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# assertion it does not have.
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return "WRONG-REASON", (
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f"mutant failed, but its output does not contain {row.expect!r} — "
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f"this is not evidence the row is enforced")
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return "red", mut_tail or "verifier failed as required"
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def report(only=None):
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rs = [r for r in rows() if not only or r.id == only]
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print("M-D1-MUT — does anything fail when the property is false?")
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print(f" {len(rows())} acceptance rows in specs/GameKernel.md §5")
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print(" NOTE: ADR-0005 and CB-WP-0005 both say 'twelve'. There are "
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"**14** — AM-4\n splits into a/b/c. The 9-of-12 prediction "
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"(75%) is evaluated below\n on the same basis: >=10 of 14.\n")
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tally = {}
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broken = []
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for r in rs:
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verdict, detail = check_row(r)
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# A multi-clause row is red only if every clause is enforced.
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if verdict == "red" and r.clauses:
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unmet = [c for c in r.clauses if not c[1]]
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if unmet:
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verdict = "PARTIAL"
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detail = (f"{len(r.clauses) - len(unmet)}/{len(r.clauses)} "
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f"clauses enforced")
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tally[verdict] = tally.get(verdict, 0) + 1
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if verdict == "HARNESS-BROKEN":
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broken.append(r.id)
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mark = {"red": "red ", "SURVIVED": "SURVIVED ",
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"unmutatable": "unmutatable", "inconclusive": "inconclusive",
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"PARTIAL": "PARTIAL ",
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"HARNESS-BROKEN": "BROKEN ",
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"WRONG-REASON": "WRONG-REASON"}[verdict]
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print(f" [{mark}] {r.id:<6} {r.claim[:52]}")
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if detail:
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for line in _wrap(detail, 66):
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print(f" {line}")
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for name, enforced, why in r.clauses:
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print(f" - {'red ' if enforced else 'NONE'} "
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f"{name}: {why[:60]}")
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if broken:
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# The harness asserting it did the work it reports.
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print(f"\nERROR — harness broken on {', '.join(broken)}; "
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f"no verdict is valid", file=sys.stderr)
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return 1
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red = tally.get("red", 0)
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total = len(rs)
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withdrawn = sum(1 for r in rs if "WITHDRAWN" in (r.unmutatable or ""))
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print(f"\n M-D1-MUT: {red}/{total} rows enforced")
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if withdrawn:
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print(f" ({withdrawn} withdrawn row(s) retained in the denominator "
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f"on purpose — a score\n improved by deleting the question "
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f"is not an improvement)")
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for k in ("PARTIAL", "SURVIVED", "WRONG-REASON", "unmutatable",
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"inconclusive"):
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if tally.get(k):
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print(f" {k:<13} {tally[k]}")
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if only:
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return 0
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print(f"\n prediction was >=10 of 14 (the ADR's 9-of-12, 75%). "
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f"Measured {red}: "
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f"{'MET' if red >= 10 else 'UNMET'}")
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if red <= 3:
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print(" CB-WP-0005 stop condition: at or below 3 of 12-equivalent, "
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"the pass is\n under-scoped and must re-plan before Phase C.")
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return 0
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def _wrap(text, width):
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words, line, out = text.split(), "", []
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for w in words:
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if len(line) + len(w) + 1 > width:
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out.append(line)
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line = w
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else:
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line = f"{line} {w}".strip()
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if line:
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out.append(line)
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return out
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def self_test():
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"""Each assertion pins a failure this harness must detect."""
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results = []
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def check(name, ok, detail=""):
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results.append((name, ok, detail))
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rs = rows()
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check("the acceptance table is enumerated", len(rs) == 14, f"{len(rs)} rows")
|
|
check("every row has a mutation or a stated reason",
|
|
all(r.mutate or r.unmutatable for r in rs))
|
|
unmut = [r for r in rs if r.unmutatable]
|
|
check("no unmutatable row has a token reason",
|
|
bool(unmut) and all(len(r.unmutatable) > 40 for r in unmut),
|
|
f"{len(unmut)} unmutatable; a bare 'unmutatable' is how a row "
|
|
f"escapes the metric")
|
|
check("every mutation target file exists",
|
|
all(os.path.isfile(os.path.join(ROOT, r.mutate[0]))
|
|
for r in rs if r.mutate))
|
|
# The control that matters: a mutation whose find-string no longer
|
|
# matches must be reported BROKEN, not silently skipped.
|
|
stale = Row("AM-X", "fixture", verify=[sys.executable, "-c", "pass"],
|
|
mutate=("Makefile", "this-string-does-not-exist", "x"))
|
|
v, _ = check_row(stale)
|
|
check("a stale mutation target is reported broken, not skipped",
|
|
v == "HARNESS-BROKEN", v)
|
|
# And a mutation that does apply must be detected as applying.
|
|
live = Row("AM-Y", "fixture",
|
|
verify=[sys.executable, "-c",
|
|
"import sys,os; sys.exit(0 if 'ZZMARKER' "
|
|
"not in open('Makefile').read() else 1)"],
|
|
mutate=("Makefile", "PY := python3", "PY := python3 # ZZMARKER"))
|
|
v2, _ = check_row(live)
|
|
check("an applied mutation that breaks the verifier reports red",
|
|
v2 == "red", v2)
|
|
check("the tree is restored after a mutation run",
|
|
"ZZMARKER" not in open(os.path.join(ROOT, "Makefile")).read())
|
|
# The FA guard: a mutant that fails for the WRONG reason must not be
|
|
# scored as red. Without this, a mutation that merely fails to compile
|
|
# would credit its row with an assertion it does not have.
|
|
wrong = Row("AM-W", "fixture",
|
|
verify=[sys.executable, "-c",
|
|
"import sys; sys.exit(0 if 'ZZW' not in "
|
|
"open('Makefile').read() else 7)"],
|
|
mutate=("Makefile", "PY := python3", "PY := python3 # ZZW"),
|
|
expect="a message the verifier never prints")
|
|
v4, _ = check_row(wrong)
|
|
check("a mutant failing for the wrong reason is not scored red",
|
|
v4 == "WRONG-REASON", v4)
|
|
|
|
# A verifier that is already red must not be scored.
|
|
dead = Row("AM-Z", "fixture", verify=[sys.executable, "-c", "raise SystemExit(3)"],
|
|
mutate=("Makefile", "PY := python3", "PY := python3 "))
|
|
v3, _ = check_row(dead)
|
|
check("a red baseline is inconclusive, not red", v3 == "inconclusive", v3)
|
|
|
|
print("mutation-check self-test (positive control)")
|
|
ok = True
|
|
for name, passed, det in results:
|
|
print(f" [{'ok ' if passed else 'FAIL'}] {name}"
|
|
+ (f" — {det}" if det else ""))
|
|
ok &= passed
|
|
return 0 if ok else 1
|
|
|
|
|
|
def main():
|
|
enter_root()
|
|
ap = argparse.ArgumentParser()
|
|
ap.add_argument("--row")
|
|
ap.add_argument("--self-test", action="store_true")
|
|
args = ap.parse_args()
|
|
if args.self_test:
|
|
return self_test()
|
|
return report(args.row)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|