llm-ingestion-okf/tests/test_docs_promises.py

"""The published format promise, asserted rather than trusted.

`README.md` told consumers that `docx` and `xlsx` ship no parser and always
fail fast. That was true when it was written and became false the moment the
converter seam landed -- silently, because prose has no test.

This library already learned that lesson once: a published promise without a
test goes false without anyone noticing, and a guarantee made publicly is a
test obligation. So the README's claimed format list is compared against the
registries it describes. Adding a format without touching the README, or
describing one that does not exist, fails here.
"""

from __future__ import annotations

import re
from pathlib import Path

from llm_ingestion_okf.extract import (
    _CORE_EXTRACTORS,
    _EVIDENCE,
    _OPTIONAL_EXTRACTORS,
    _PANDOC_FORMATS,
)

PROJECT_ROOT = Path(__file__).resolve().parents[1]
README = PROJECT_ROOT / "README.md"

# The line the README carries, and the one place this list is written in prose.
_FORMAT_LINE = re.compile(r"^<!-- extract-formats: (.+) -->$", re.MULTILINE)


def _declared_formats() -> set[str]:
    match = _FORMAT_LINE.search(README.read_text(encoding="utf-8"))
    assert match is not None, (
        "README.md carries no `<!-- extract-formats: ... -->` marker; without "
        "it this test cannot check the promise and the promise can drift"
    )
    return {token.strip() for token in match.group(1).split(",")}


def test_the_readme_names_exactly_the_formats_that_exist() -> None:
    assert _declared_formats() == set(_CORE_EXTRACTORS) | set(_OPTIONAL_EXTRACTORS)


def test_the_readme_no_longer_claims_docx_and_xlsx_fail_fast() -> None:
    """The specific false sentence, pinned so it cannot come back.

    Written as a search for the claim rather than for its exact wording: the
    sentence could be rephrased and stay just as wrong.
    """
    text = README.read_text(encoding="utf-8").lower()
    for claim in (
        "docx` and `xlsx` ship no parser",
        "docx`/`xlsx` remain\nunimplemented",
        "docx`/`xlsx` are still unimplemented",
    ):
        assert claim.lower() not in text, f"README still claims: {claim}"


def test_the_readme_states_which_rows_are_not_measured() -> None:
    """A row that is not `measured` must not read as a supported one.

    Three of the five office formats have denominator ZERO in the corpus this
    work was measured on. A consumer reading the README should be able to see
    that without reading the source.

    Reads the CLASS from the table rather than the literal `unmeasured`: round
    9 moved those three rows to `constructed`, and a test pinned to one word
    would have gone green over an empty set the moment the word changed. Every
    class that is not `measured` must be named in the README, whichever it is.
    """
    text = README.read_text(encoding="utf-8")
    weaker = {s.lstrip("."): e for s, e in _EVIDENCE.items() if e != "measured"}
    assert weaker, "the evidence table lists no rows weaker than measured"
    for suffix, evidence in weaker.items():
        assert suffix in text, f"README does not mention the {evidence} row {suffix}"
        assert evidence in text.lower(), f"README does not use the word {evidence}"


def test_the_readme_still_states_what_stays_out() -> None:
    """`.doc` (Word 97) and rastered PDFs are out, and stay named.

    A format list that grows without also saying what it excludes reads as a
    promise to handle anything office-shaped.
    """
    text = README.read_text(encoding="utf-8")
    assert ".doc`" in text or "Word 97" in text
    assert ".doc" not in set(_PANDOC_FORMATS)


def test_the_readme_recursion_claim_matches_the_door() -> None:
    """The README says the drop directory is walked recursively. A sentence is
    not a mechanism, so both halves are asserted here: the claim is in the
    prose, and the door actually does it. Either one alone can go stale --
    prose that outlived the code is the failure this whole module exists for.
    """
    import tempfile

    text = README.read_text(encoding="utf-8")
    assert "walked **recursively**" in text

    from llm_ingestion_okf.inbox import GateDecision, process_inbox

    with tempfile.TemporaryDirectory() as workspace:
        inbox = Path(workspace) / "inbox" / "sub"
        inbox.mkdir(parents=True)
        (inbox / "deep.md").write_text("Body\n", encoding="utf-8")
        result = process_inbox(
            Path(workspace) / "inbox",
            Path(workspace) / "bundle",
            "2026-09-07T08:00:00Z",
            okf_type="reference",
            gate=lambda body: GateDecision(sanitized_text=body, disposition="warn", reasons=()),
        )
    assert [item.source_file for item in result.persisted] == ["sub/deep.md"]


# --- the visible table, K3-26 ----------------------------------------------
#
# The comment marker above is machine-readable and invisible to a reader: the
# README's own prose named FIVE of the thirteen types the registry reads, and
# nothing went red, because the marker test only asks that the hidden list is
# complete. A reader does not read the marker. So the table a reader does see
# is pinned to the same registry, row for row, and to the evidence class the
# code records for each row.

_TABLE_HEADING = "## Supported file types"

# The evidence cell for a row `_EVIDENCE` does not carry. Those five are the
# stdlib rows: `_EVIDENCE` records a CORPUS class, and a row that has never
# been given one must not borrow `measured` from the row beside it.
_NO_CLASS = "stdlib, no corpus class"


def _table_rows() -> dict[str, list[str]]:
    """The table's data rows, keyed by suffix, with markup stripped per cell.

    Backticks and asterisks are removed rather than matched, so the table can
    be formatted freely and this test still reads what it says.
    """
    text = README.read_text(encoding="utf-8")
    assert _TABLE_HEADING in text, (
        f"README.md carries no `{_TABLE_HEADING}` section; the format list is "
        "then visible only in a hidden comment, which is what K3-26 fixed"
    )
    rows: dict[str, list[str]] = {}
    for line in text.split(_TABLE_HEADING, 1)[1].splitlines():
        stripped = line.strip()
        if not stripped.startswith("|"):
            if rows:
                break
            continue
        cells = [re.sub(r"[`*]", "", cell).strip() for cell in stripped.strip("|").split("|")]
        if cells and cells[0].startswith("."):
            rows[cells[0]] = cells
    return rows


def test_the_readme_table_names_every_type_the_registry_reads() -> None:
    assert set(_table_rows()) == set(_CORE_EXTRACTORS) | set(_OPTIONAL_EXTRACTORS)


def test_the_readme_table_states_the_evidence_class_the_code_records() -> None:
    rows = _table_rows()
    assert rows, "no data rows found under the supported-file-types heading"
    for suffix, cells in rows.items():
        assert len(cells) >= 4, f"the {suffix} row has no evidence column: {cells}"
        assert cells[3] == _EVIDENCE.get(suffix, _NO_CLASS), (
            f"the {suffix} row says {cells[3]!r}; the code records "
            f"{_EVIDENCE.get(suffix, _NO_CLASS)!r}"
        )


def test_the_readme_table_separates_core_from_the_extract_extra() -> None:
    """Which rows need the optional extra is the first thing a consumer asks."""
    for suffix, cells in _table_rows().items():
        gated = "[extract]" in cells[2]
        assert gated == (suffix in _OPTIONAL_EXTRACTORS), (
            f"the {suffix} row's dependency cell reads {cells[2]!r}"
        )


def test_the_readme_opening_does_not_name_five_of_thirteen() -> None:
    """The first thing a reader sees must not undersell what the code reads.

    Either form passes: a pointer to the table, or the whole set spelled out.
    A partial list -- the state before K3-26 -- passes neither.
    """
    intro = README.read_text(encoding="utf-8").split("## Install", 1)[0]
    if "#supported-file-types" in intro:
        return
    every = set(_CORE_EXTRACTORS) | set(_OPTIONAL_EXTRACTORS)
    named = {s for s in every if re.search(rf"\b{s.lstrip('.')}\b", intro, re.IGNORECASE)}
    assert named == every, f"the opening names {sorted(named)}, not all of {sorted(every)}"


def test_the_readme_carries_only_one_file_type_table() -> None:
    """A second table over the same rows is a copy nothing checks.

    `### Binary extraction` carried its own six-row Format/Reader/Evidence
    table until 2026-09-12. It was true when written, and it was reachable by
    exactly the failure this module exists for: an evidence class copied into
    prose that no test reads. Its rows now live in the pinned table alone.
    """
    text = README.read_text(encoding="utf-8")
    section = text.split("### Binary extraction", 1)[1].split("\n## ", 1)[0]
    rows = [line for line in section.splitlines() if line.strip().startswith("|")]
    assert not rows, f"a second file-type table is back under Binary extraction: {rows}"