feat(pair-corpus-honesty): function-scoped honest scorer with mechanisms and loss counters

Tasks 1.2, 2.1-2.5 and 6.2 (pair-side filters).

- pairs.py: coverage with a source counts as detection and as leak;
  function-scoped matching by line-range containment from the vulnerable
  side's parse (unresolvable labels are counted loss, never silent
  misses); exact or alias sink matching; weak CWE-only labels never match;
  side-by-side inventory/overlay/hunter scorers; per_profile,
  per_mechanism, achievable, known_limit and loss payload; loader rejects
  unknown mechanism/provenance/split and reserved or missing function
  labels on harvested slices; candidate rulesets thread through for the
  improve loop.
- overlay.py: OverlayRecord.function (additive) filled from the shared
  naming helper in one parse; benchmark.py: ExpectedFinding.mechanism.
- cli pairs: --slice over every slice, --profile, --split, --hunter,
  --hunter-model.
- catalogs migrated to the new schema (provenance, split, function,
  mechanism, known_limit for owasp-java-hash); baseline recorded in the
  spec notes.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG
This commit is contained in:
Marius Ciepluch
2026-09-05 10:45:43 +02:00
co-authored by Claude Fable 5.1
parent 8ab4207618
commit c0b9e41000
9 changed files with 1915 additions and 127 deletions
+554
View File
@@ -3,6 +3,8 @@
import json
from pathlib import Path
import pytest
from openultrasast.benchmark import ExpectedFinding
from openultrasast.cli import main
from openultrasast.gate import LANGUAGE_MANIFESTS
@@ -245,3 +247,555 @@ def test_cli_vfc_json_includes_dual_scorers() -> None:
assert "overlay" in payload["scorers"]["vfc"]
assert "inventory" in payload["scorers"]["vfc"]
assert payload["per_slice"]["vfc"]["pairs"] == payload["scorers"]["vfc"]["overlay"]["pairs"]
# --- pair-corpus-honesty: honest scorer -------------------------------------
def _case(
tmp_path: Path, name: str, vuln_src: str, fixed_src: str, expected: ExpectedFinding, *, slice_name: str = "sast", **extra: object
) -> PairCase:
vuln = tmp_path / f"{name}-vuln.py"
fixed = tmp_path / f"{name}-fixed.py"
vuln.write_text(vuln_src)
fixed.write_text(fixed_src)
return PairCase(
name=name,
slice=slice_name,
language="python",
origin="test",
vuln_file=vuln,
fixed_file=fixed,
relpath="app.py",
expected=(expected,),
min_recall=1.0,
fix_policy="silent",
provenance=str(extra.get("provenance", "synthetic")),
split=str(extra.get("split", "train")),
known_limit=extra.get("known_limit"), # type: ignore[arg-type]
)
def test_coverage_with_source_counts_as_detection_and_as_leak(tmp_path: Path) -> None:
# hashlib.new is a fact sink the regex inventory does not spell -> overlay coverage, never promote.
src = "import hashlib\nfrom flask import request\n\ndef h():\n data = request.args.get('x')\n return hashlib.new(data)\n"
expected = ExpectedFinding(
cwe="CWE-327",
vulnerability_class="weak hash",
path="app.py",
evidence="",
rule_id="python-weak-hash",
sink="hashlib",
mechanism="config_sink_weak_literal",
)
both = evaluate_pair(_case(tmp_path, "cov", src, src, expected))
assert both.detected_vuln and "coverage" in both.detection_kinds
assert not both.silent_fix # the same coverage record on the fixed side is a leak
def test_function_scoped_match_rejects_detection_outside_the_named_function(tmp_path: Path) -> None:
src = "from flask import request\n\ndef other():\n return eval(request.args.get('x'))\n\ndef target():\n return 1\n"
row = ExpectedFinding(
cwe="CWE-95",
vulnerability_class="code injection",
path="app.py",
evidence="",
rule_id="python-unsafe-eval",
sink="eval",
function="target",
mechanism="source_reaches_sink",
)
outcome = evaluate_pair(_case(tmp_path, "fn", src, "def target():\n return 1\n", row))
assert not outcome.detected_vuln and outcome.silent_fix
row_ok = ExpectedFinding(**{**row.__dict__, "function": "other"})
assert evaluate_pair(_case(tmp_path, "fn2", src, "def target():\n return 1\n", row_ok)).detected_vuln
def test_cwe_only_row_is_a_weak_label_and_never_matches(tmp_path: Path) -> None:
src = "from flask import request\n\ndef f():\n return eval(request.args.get('x'))\n"
weak = ExpectedFinding(cwe="CWE-95", vulnerability_class="code injection", path="app.py", evidence="", mechanism="source_reaches_sink")
outcome = evaluate_pair(_case(tmp_path, "weak", src, "def f():\n return 1\n", weak))
assert outcome.weak_labels == 1
assert not outcome.detected_vuln
def test_catalog_rejects_unknown_mechanism_and_sink_unknown_without_anchor(tmp_path: Path) -> None:
from openultrasast.pairs import CatalogError, _load_catalog_file
(tmp_path / "v.py").write_text("x = 1\n")
(tmp_path / "f.py").write_text("x = 1\n")
head = (
'[[pair]]\nname = "t"\nslice = "sast"\nvuln = "v.py"\nfixed = "f.py"\nrelpath = "app.py"\n\n'
'[[pair.expected]]\ncwe = "CWE-95"\nclass = "x"\npath = "app.py"\n'
)
(tmp_path / "bad_mech.toml").write_text(head + 'sink = "eval"\nmechanism = "not_a_mechanism"\n')
with pytest.raises(CatalogError, match="unknown mechanism"):
_load_catalog_file(tmp_path / "bad_mech.toml")
(tmp_path / "bad_sink.toml").write_text(head + 'sink = "unknown"\nmechanism = "other"\n')
with pytest.raises(CatalogError, match="sink=unknown"):
_load_catalog_file(tmp_path / "bad_sink.toml")
(tmp_path / "bad_prov.toml").write_text(
head.replace('slice = "sast"\n', 'slice = "sast"\nprovenance = "robot"\n') + 'sink = "eval"\nmechanism = "other"\n'
)
with pytest.raises(CatalogError, match="unknown provenance"):
_load_catalog_file(tmp_path / "bad_prov.toml")
def test_known_limit_pairs_are_evaluated_but_excluded_from_achievable(tmp_path: Path) -> None:
src = "from flask import request\n\ndef f():\n return eval(request.args.get('x'))\n"
row = ExpectedFinding(
cwe="CWE-95",
vulnerability_class="code injection",
path="app.py",
evidence="",
rule_id="python-unsafe-eval",
sink="eval",
mechanism="cross_artifact",
)
limited = _case(tmp_path, "lim", src, "def f():\n return 1\n", row, known_limit="cross_artifact: needs a properties file")
plain = _case(
tmp_path,
"plain",
src,
"def f():\n return 1\n",
ExpectedFinding(**{**row.__dict__, "mechanism": "source_reaches_sink"}),
provenance="agent",
split="holdout",
)
result = evaluate_catalog([limited, plain])
assert result.known_limit == ("lim",)
assert result.per_slice["sast"].pairs == 2 and result.achievable["sast"].pairs == 1
assert set(result.per_profile) == {"synthetic", "agent"}
assert set(result.per_mechanism) == {"cross_artifact", "source_reaches_sink"}
assert result.loss["sast"]["known_limit"] == 1
assert "overlay" in result.scorers["sast"] and "inventory" in result.scorers["sast"]
assert result.degradations and result.degradations[0]["reason"] == "hunter_model_unavailable"
def test_hunter_scorer_uses_same_rules_with_a_scripted_client(tmp_path: Path) -> None:
from openultrasast.findings import StaticFinding
src = "from flask import request\n\ndef f():\n return eval(request.args.get('x'))\n"
row = ExpectedFinding(
cwe="CWE-95",
vulnerability_class="code injection",
path="app.py",
evidence="",
sink="eval",
function="f",
mechanism="source_reaches_sink",
)
def scripted(root: Path) -> list[StaticFinding]:
text = (root / "app.py").read_text()
if "eval(" not in text:
return []
return [
StaticFinding(
finding_id="tool-hunter:app.py:4",
path="app.py",
title="eval of request input",
severity="high",
confidence="medium",
evidence_level="suspicion",
rationale="CWE-95 eval executes attacker input",
line=4,
function_name=None,
reachability_status="unknown",
reachability_evidence=[],
reachability_conditions=[],
tags=[],
ranking_priority=1.0,
)
]
case = _case(tmp_path, "hunt", src, "def f():\n return 1\n", row)
result = evaluate_catalog([case], hunter=scripted)
hunter = result.scorers["sast"]["hunter"]
assert hunter.pair_correct == 1 and hunter.detected_vuln == 1 and hunter.silent_fix == 1
assert not result.degradations
def test_juliet_strcpy_pair_bodies_differ_and_java_hash_is_known_limit() -> None:
cases = {case.name: case for case in select_slice(load_pair_catalog(), "sast")}
strcpy = cases["juliet-c-cwe121-strcpy"]
assert strcpy.vuln_file.read_text() != strcpy.fixed_file.read_text()
assert "dataBadBuffer[10]" in strcpy.vuln_file.read_text() and "data = dataGoodBuffer" in strcpy.fixed_file.read_text()
assert cases["owasp-java-hash"].known_limit and cases["owasp-java-hash"].known_limit.startswith("cross_artifact")
assert all(row.mechanism for case in cases.values() for row in case.expected)
assert all(case.provenance == "synthetic" for case in cases.values())
def test_vfc_rows_name_functions_and_carry_no_weak_labels() -> None:
cases = select_slice(load_pair_catalog(), "vfc")
from openultrasast.pairs import is_weak_label
assert cases and all(row.function for case in cases for row in case.expected)
assert not any(is_weak_label(row) for case in cases for row in case.expected)
assert {case.split for case in cases} == {"train", "holdout"}
def test_cli_pairs_profile_and_split_filters() -> None:
import io
from contextlib import redirect_stdout
buf = io.StringIO()
with redirect_stdout(buf):
assert main(["pairs", "--slice", "sast", "--profile", "synthetic", "--split", "holdout", "--json"]) == 0
payload = json.loads(buf.getvalue())
assert payload["overall"]["pairs"] >= 3
assert set(payload["per_profile"]) == {"synthetic"}
assert "per_mechanism" in payload and "loss" in payload and "achievable" in payload
assert all(item["split"] == "holdout" for item in payload["outcomes"])
def test_new_slices_load_offline_and_score_with_profiles() -> None:
from openultrasast.pairs import PROVENANCES
catalog = load_pair_catalog()
# agent-vfc rows enter the loaded catalog only after human review (Req 5.3); candidates wait in a separate file.
candidates = Path("benchmarks/pairs/agent-vfc/catalog-candidates.toml")
assert candidates.is_file() and "reviewer" in candidates.read_text()
assert all(case.provenance == "agent" for case in select_slice(catalog, "agent-vfc"))
for slice_name, expected_provenance in (("vibe-py", "human"), ("vfc-js", "human")):
cases = select_slice(catalog, slice_name)
assert cases, slice_name
assert all(case.vuln_file.is_file() and case.fixed_file.is_file() for case in cases)
assert all(case.license for case in cases), slice_name
assert all(case.provenance == expected_provenance for case in cases), slice_name
assert {case.split for case in cases} <= {"train", "holdout"}
header = cases[0].vuln_file.read_text()[:600]
assert "Provenance:" in header and "license:" in header
result = evaluate_catalog(cases[:2])
assert result.per_slice[slice_name].pairs == 2
assert set(result.per_profile) <= PROVENANCES and expected_provenance in result.per_profile
assert result.per_mechanism and slice_name in result.loss
# --- review round 1 remediation (RED first) -----------------------------------
def test_weak_label_never_matches_on_inventory_fallback(tmp_path: Path) -> None:
# A syntax error forces parse_failed on both sides -> overlay falls back to inventory.
src = "from flask import request\n\ndef f(:\n return eval(request.args.get('x'))\n"
weak = ExpectedFinding(cwe="CWE-95", vulnerability_class="code injection", path="app.py", evidence="", mechanism="source_reaches_sink")
outcome = evaluate_pair(_case(tmp_path, "weakfb", src, "def f():\n return 1\n", weak))
assert outcome.parse_failed_vuln == 1
assert outcome.weak_labels == 1
assert not outcome.detected_vuln
assert outcome.misses == ("-:app.py:CWE-95",)
def test_sink_match_is_exact_or_alias_not_substring() -> None:
from openultrasast.pairs import _overlay_matches_expected
from openultrasast.semantic import OverlayRecord
record = OverlayRecord(
proposal_id="overlay-coverage:app.py:3:execute",
path="app.py",
line=3,
disposition="coverage",
reason="x",
cwe="CWE-89",
sources=("request",),
sinks=("execute",),
sanitizers=(),
evidence_level="static_corroboration",
)
exec_row = ExpectedFinding(
cwe="CWE-78", vulnerability_class="x", path="app.py", evidence="", sink="exec", mechanism="source_reaches_sink"
)
assert not _overlay_matches_expected(exec_row, [record], "python")
exact = ExpectedFinding(
cwe="CWE-89", vulnerability_class="x", path="app.py", evidence="", sink="execute", mechanism="source_reaches_sink"
)
assert _overlay_matches_expected(exact, [record], "python")
alias = ExpectedFinding(
cwe="CWE-89", vulnerability_class="x", path="app.py", evidence="", rule_id="python-sql-injection", mechanism="source_reaches_sink"
)
assert _overlay_matches_expected(alias, [record], "python")
def test_vfc_style_slice_rows_require_a_named_function(tmp_path: Path) -> None:
from openultrasast.pairs import CatalogError, _load_catalog_file
(tmp_path / "v.js").write_text("x = 1\n")
(tmp_path / "f.js").write_text("x = 1\n")
head = (
'[[pair]]\nname = "t"\nslice = "vfc-js"\nvuln = "v.js"\nfixed = "f.js"\nrelpath = "a.js"\n\n'
'[[pair.expected]]\ncwe = "CWE-78"\nclass = "x"\npath = "a.js"\nmechanism = "source_reaches_sink"\n'
)
(tmp_path / "nofn.toml").write_text(head + 'sink = "exec"\n')
with pytest.raises(CatalogError, match="function"):
_load_catalog_file(tmp_path / "nofn.toml")
(tmp_path / "anon.toml").write_text(head + 'function = "<anon>"\n')
with pytest.raises(CatalogError, match="function"):
_load_catalog_file(tmp_path / "anon.toml")
(tmp_path / "ok.toml").write_text(head + 'function = "run"\n')
assert _load_catalog_file(tmp_path / "ok.toml")[0].expected[0].function == "run"
def test_known_limit_pairs_emit_no_improve_signals(tmp_path: Path) -> None:
src = "def f():\n return 1\n"
row = ExpectedFinding(
cwe="CWE-95",
vulnerability_class="x",
path="app.py",
evidence="",
rule_id="python-unsafe-eval",
sink="eval",
mechanism="cross_artifact",
)
limited = _case(tmp_path, "lim2", src, src, row, known_limit="cross_artifact: needs a properties file")
result = evaluate_catalog([limited])
assert not result.outcomes[0].detected_vuln
assert all(signal["pair"] != "lim2" for signal in result.signals)
# --- review round 2 remediation (RED first) -----------------------------------
def test_function_at_skips_anonymous_and_module_ranges() -> None:
from openultrasast.semantic.overlay import function_at
ranges = (("<module>", 1, 40), ("handler", 3, 20), ("<anon>", 5, 12))
assert function_at(ranges, 7) == "handler" # innermost *named* function, never "<anon>"
assert function_at(ranges, 25) is None
assert function_at((("<anon>", 1, 9),), 4) is None
@pytest.mark.semantic
def test_promotion_inside_a_callback_matches_the_enclosing_named_function(tmp_path: Path) -> None:
from openultrasast.semantic.extra import has_semantic_extra
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
src = (
"const cp = require('child_process');\n"
"function handler(req, res) {\n"
" [req.query.cmd].forEach(function (c) {\n"
" cp.exec(c);\n"
" });\n"
"}\n"
)
fixed = "function handler(req, res) {\n res.end('ok');\n}\n"
vuln = tmp_path / "v.js"
fix = tmp_path / "f.js"
vuln.write_text(src)
fix.write_text(fixed)
row = ExpectedFinding(
cwe="CWE-78", vulnerability_class="x", path="app.js", evidence="", function="handler", sink="exec", mechanism="source_reaches_sink"
)
case = PairCase(
name="cb",
slice="vfc-js",
language="javascript",
origin="test",
vuln_file=vuln,
fixed_file=fix,
relpath="app.js",
expected=(row,),
min_recall=1.0,
fix_policy="silent",
provenance="human",
)
outcome = evaluate_pair(case)
assert outcome.detected_vuln, outcome
assert outcome.pair_correct
def test_loader_rejects_reserved_words_as_function_labels(tmp_path: Path) -> None:
from openultrasast.pairs import CatalogError, _load_catalog_file
(tmp_path / "v.js").write_text("x = 1\n")
(tmp_path / "f.js").write_text("x = 1\n")
head = (
'[[pair]]\nname = "t"\nslice = "vfc-js"\nvuln = "v.js"\nfixed = "f.js"\nrelpath = "a.js"\n\n'
'[[pair.expected]]\ncwe = "CWE-78"\nclass = "x"\npath = "a.js"\nmechanism = "source_reaches_sink"\nsink = "exec"\n'
)
for bad in ("function", "def", "return"):
(tmp_path / "bad.toml").write_text(head + f'function = "{bad}"\n')
with pytest.raises(CatalogError, match="function"):
_load_catalog_file(tmp_path / "bad.toml")
def test_agent_vfc_stays_empty_until_reviewed() -> None:
catalog = load_pair_catalog()
loaded = select_slice(catalog, "agent-vfc")
candidates = Path("benchmarks/pairs/agent-vfc/catalog-candidates.toml")
# Req 5.3: nothing loads until a human sets `reviewer`; the candidates file must not be empty meanwhile.
assert candidates.is_file() and candidates.read_text().count("[[pair]]") >= 1
assert loaded == () or all(case.provenance == "agent" for case in loaded)
reviewed_in_recipes = 'reviewer = "pending"' not in Path("benchmarks/pairs/agent-vfc/recipes.toml").read_text()
assert bool(loaded) == reviewed_in_recipes
# --- debug round after review 3: shared named ranges, containment-only matching -----
def _js_case(tmp_path: Path, name: str, src: str, function: str) -> PairCase:
vuln = tmp_path / f"{name}-v.js"
fix = tmp_path / f"{name}-f.js"
vuln.write_text(src)
fix.write_text("function untouched() {\n return 1;\n}\n")
row = ExpectedFinding(
cwe="CWE-78", vulnerability_class="x", path="app.js", evidence="", function=function, sink="exec", mechanism="source_reaches_sink"
)
return PairCase(
name=name,
slice="vfc-js",
language="javascript",
origin="test",
vuln_file=vuln,
fixed_file=fix,
relpath="app.js",
expected=(row,),
min_recall=1.0,
fix_policy="silent",
provenance="human",
)
_JS_FORMS = {
"arrow": "const cp = require('child_process');\nconst h = (req, res) => {\n cp.exec(req.query.cmd);\n};\n",
"exports": "const cp = require('child_process');\nexports.h = function (req, res) {\n cp.exec(req.query.cmd);\n};\n",
"method": "const cp = require('child_process');\nclass Ctl {\n h(req, res) {\n cp.exec(req.query.cmd);\n }\n}\n",
"property": (
"const cp = require('child_process');\nmodule.exports = {\n h: function (req, res) {\n cp.exec(req.query.cmd);\n },\n};\n"
),
}
@pytest.mark.semantic
@pytest.mark.parametrize("form", sorted(_JS_FORMS))
def test_declarator_named_functions_match_their_labels(tmp_path: Path, form: str) -> None:
from openultrasast.semantic.extra import has_semantic_extra
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
outcome = evaluate_pair(_js_case(tmp_path, form, _JS_FORMS[form], "h"))
assert outcome.detected_vuln, (form, outcome)
@pytest.mark.semantic
def test_containment_matches_outer_label_and_rejects_inner_label(tmp_path: Path) -> None:
from openultrasast.semantic.extra import has_semantic_extra
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
src = (
"const cp = require('child_process');\n"
"function outer(req) {\n"
" function inner(c) {\n"
" cp.exec(c);\n"
" }\n"
" inner(req.query.cmd);\n"
" cp.exec(req.query.top);\n"
"}\n"
)
# The sink inside `inner` also lies inside `outer`'s range: containment says yes, name equality would say no.
assert evaluate_pair(_js_case(tmp_path, "outer", src, "outer")).detected_vuln
# A label naming `inner` must not match the promote at line 7, which is outside `inner`.
only_top = src.replace(" cp.exec(c);\n", " return c;\n")
assert not evaluate_pair(_js_case(tmp_path, "inner", only_top, "inner")).detected_vuln
def test_unresolvable_function_label_is_a_visible_loss_not_a_silent_miss(tmp_path: Path) -> None:
src = "from flask import request\n\ndef f():\n return eval(request.args.get('x'))\n"
row = ExpectedFinding(
cwe="CWE-95",
vulnerability_class="x",
path="app.py",
evidence="",
function="does_not_exist",
sink="eval",
mechanism="source_reaches_sink",
)
outcome = evaluate_pair(_case(tmp_path, "unres", src, "def f():\n return 1\n", row))
assert not outcome.detected_vuln
assert outcome.unresolved_labels == 1
assert any(miss.endswith("!unresolved") for miss in outcome.misses)
result = evaluate_catalog([_case(tmp_path, "unres2", src, "def f():\n return 1\n", row)])
assert result.loss["sast"]["unresolved_function_labels"] == 1
def test_named_function_ranges_use_declarator_names() -> None:
from openultrasast.semantic.extra import has_semantic_extra
from openultrasast.semantic.functions import declarator_name, named_function_ranges
assert declarator_name("const listProcessesOnPort = module.exports.listProcessesOnPort = async port => {") == "listProcessesOnPort"
assert declarator_name(" exec('df -k ' + path, function(err, stdout) {") is None
assert declarator_name(" function (req, res) {") is None
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
src = "\n".join(
[
"function a() { return 1; }",
"const b = (x) => { return x; };",
"exports.c = function (y) { return y; };",
"class K {",
" d(z) {",
" return z;",
" }",
"}",
"const o = {",
" e: function (w) {",
" return w;",
" },",
"};",
"",
]
)
ranges = named_function_ranges("f.js", src, "javascript")
assert ranges is not None
assert {name for name, _, _ in ranges} >= {"a", "b", "c", "d", "e"}
assert "<anon>" not in {name for name, _, _ in ranges}
# --- review round 4 remediation (RED first) -----------------------------------
@pytest.mark.semantic
def test_c_function_with_return_type_on_previous_line_keeps_its_parser_name() -> None:
from openultrasast.semantic.extra import has_semantic_extra
from openultrasast.semantic.functions import function_at, named_function_ranges
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
ranges = named_function_ranges("a.c", "static int\nfoo(int x)\n{\n return x;\n}\n", "c")
assert ranges is not None and any(name == "foo" and start <= 4 <= end for name, start, end in ranges)
assert function_at(ranges, 4) == "foo"
def test_declarator_name_knows_perl_subs_and_never_names_calls() -> None:
from openultrasast.semantic.functions import declarator_name
assert declarator_name("sub link_hash_cert {") == "link_hash_cert"
assert declarator_name(" return foo(bar)") is None
assert declarator_name(" print(x)") is None
assert declarator_name("synchronized (lock) {") is None
assert declarator_name("int main(int argc, char **argv)") == "main"
# --- review round 5 remediation (RED first) -----------------------------------
def test_declarator_name_strips_cpp_qualification_to_match_unqualified_labels() -> None:
from openultrasast.semantic.functions import declarator_name
assert declarator_name("bool FileReaderLoader::ArrayBufferResult(int a) {") == "ArrayBufferResult"
assert declarator_name("void ns::Klass::run(const std::string& s) const {") == "run"
assert declarator_name("std::string Foo::bar() {") == "bar"
@pytest.mark.semantic
def test_cpp_qualified_method_range_is_found_by_its_unqualified_label() -> None:
from openultrasast.semantic.extra import has_semantic_extra
from openultrasast.semantic.functions import function_at, named_function_ranges, spans_named
if not has_semantic_extra():
pytest.skip("tree-sitter extra absent")
ranges = named_function_ranges("a.cc", "bool K::m(int a) {\n return a;\n}\n", "cpp")
assert ranges is not None
assert spans_named(ranges, "m") == ((1, 3),)
assert function_at(ranges, 2) == "m"