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lean-bench/tests/test_anchors.py
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Zayden-Jung d3555d9a52
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Rebuild lean-bench: pages in, verified indexed Lean out
Replaces the previous tree entirely. The pipeline is four separable pieces, each
testable on its own:

1. leanbench/llm.py      provider-neutral OpenAI-compatible connector, stdlib only,
                        with retries, JSON coercion and a scripted client so the
                        rest of the code is testable without a network.
2. leanbench/detect.py   per-page detection of formalizable mathematics. Case 1 is
                        mathematics asserted as fact (definition/theorem/lemma/...,
                        deliberately not sub-classified); case 2 is a problem left
                        open to the reader. Hits come back as spans -- start page
                        and index, end page and index -- so several per page is
                        normal. A hit cut off by the page end makes the detector
                        re-read that page together with the next, repeatedly, so an
                        item spread over three pages is found whole.
                        Offsets come from verbatim quotes resolved by
                        leanbench/anchors.py (exact -> whitespace-insensitive ->
                        fuzzy), because models quote well and count badly.
3. leanbench/formalize.py + leanbench/verify.py
                        each span becomes one Lean 4 declaration, judged by the real
                        compiler: full elaboration for case 1, statement legality
                        only for case 2, which has no proof to check. Lean's own
                        diagnostics feed back for a repair attempt. "verified" (Lean
                        accepted it) and "proved" (accepted with no sorry) are kept
                        strictly apart.
4. leanbench/db.py       indexed SQLite plus JSONL export. Every item is indexed by
                        the types of its inputs, or by its own type when it is not a
                        proof, and records the source book (sha256) and the page it
                        starts on -- so `drop --source H --pages A-B` followed by a
                        re-ingest redoes exactly those pages and nothing else.

Also: lean/ Lake project pinned to Mathlib, docker/ image carrying Lean 4 and a
prebuilt Mathlib (the Mathlib revision and the toolchain are resolved against each
other at build time rather than both hardcoded), and .gitea/workflows for tests,
image build and push to the Gitea registry, and a manual "submit a book" run.

58 tests; they need neither network nor Lean.
2026-09-19 07:05:52 +00:00

55 lines
2.0 KiB
Python

from __future__ import annotations
from leanbench.anchors import find, resolve_span
TEXT = (
"Theorem 1.6.2. Let a, b and c be integers. If a divides b and a divides c,\n"
"then a divides b + c.\n\nProof. Write b = a k."
)
def test_exact_match() -> None:
match = find(TEXT, "Theorem 1.6.2.")
assert match is not None and match.method == "exact"
assert TEXT[match.start : match.end] == "Theorem 1.6.2."
def test_whitespace_insensitive_match_across_a_line_break() -> None:
match = find(TEXT, "a divides c, then a divides b + c.")
assert match is not None
assert match.method == "whitespace"
assert TEXT[match.start : match.end].replace("\n", " ") == "a divides c, then a divides b + c."
def test_fuzzy_match_survives_a_typo() -> None:
match = find(TEXT, "Let a, b and c be integres. If a divides b")
assert match is not None
assert match.method == "fuzzy"
assert "integers" in TEXT[match.start : match.end]
def test_missing_anchor_is_reported_not_guessed() -> None:
assert find(TEXT, "nothing like this appears anywhere in the page") is None
def test_resolve_span_covers_start_to_end() -> None:
span = resolve_span(TEXT, "Theorem 1.6.2.", "a divides b + c.")
assert span is not None and span.resolved
assert TEXT[span.start : span.end].startswith("Theorem 1.6.2.")
assert TEXT[span.start : span.end].endswith("a divides b + c.")
def test_resolve_span_falls_back_when_the_end_quote_is_wrong() -> None:
span = resolve_span(TEXT, "Theorem 1.6.2.", "this ending was invented", fallback_length=40)
assert span is not None
assert "truncated" in span.method
assert span.end - span.start == 40
def test_resolve_span_searches_forward_from_the_cursor() -> None:
text = "alpha beta alpha gamma"
first = resolve_span(text, "alpha", "beta")
assert first is not None and first.start == 0
second = resolve_span(text, "alpha", "gamma", search_from=first.end)
assert second is not None and second.start == text.rindex("alpha")