booth/tests/test_cli.py

"""`scripts/booth` — the surface every fleet session actually calls.

It had no tests at all, which the 2026-09-22 bug-hunt panel found the hard way:
its guard-strength table returned UNVERIFIED for every CLI claim because nothing
in the suite executes the script. Two of that round's findings live in here.

These run the real script under the real system `python3` with no venv, which
also makes them a live check on INV-1 (stdlib-only): a third-party import in
`marks.py` fails here the same way it fails on a fleet host.
"""
import json
import os
import pathlib
import subprocess

import pytest

SCRIPT = pathlib.Path(__file__).parent.parent / "scripts" / "booth"

# Exit codes the verbs promise. 0 is a successful read; a reader that CRASHED
# must never be one of the meaningful codes, or a caller cannot tell "no" from
# "broken" — which is the whole finding.
OK, UNANSWERED, NO_SUCH_PICK, READER_FAILED = 0, 1, 2, 3


def run(data, *args, **kw):
    env = {**os.environ, "BOOTH_DATA_DIR": str(data), "BOOTH_URL": "http://booth.invalid"}
    return subprocess.run([str(SCRIPT), *args], capture_output=True, text=True,
                          env=env, timeout=30, **kw)


@pytest.fixture
def booth(tmp_path):
    b = tmp_path / "b"
    b.mkdir()
    return tmp_path, b


def _declare(booth_dir, mark_id="winner"):
    import sys
    sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
    from booth.marks import declare_pick
    declare_pick(booth_dir, mark_id,
                 {"prompt": "Which one?", "options": ["A", "B"]})


def test_marks_prints_one_json_document(booth):
    """`booth marks <name>` is a read. Its stdout is parsed by the session that
    called it, so it has to be ONE document — and exit 0, because the read
    succeeded. Whether a pick is open is in the payload's `open` list, which is
    where a caller should read it from."""
    data, b = booth
    _declare(b)
    r = run(data, "marks", "b")
    assert r.returncode == OK, r.stderr
    doc = json.loads(r.stdout)
    assert doc["open"] == ["winner"]


def test_marks_wait_prints_once_not_once_per_poll(booth):
    """`--wait` polls every 2 s and printed the whole document on every pass, so
    a capture held several concatenated JSON values and `jq` could not read any
    of them. The wait is a wait; the print is the result."""
    data, b = booth
    _declare(b)
    import sys
    sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
    from booth.marks import answer_pick

    # Answer it after the first poll so --wait genuinely loops at least once.
    r = subprocess.Popen([str(SCRIPT), "marks", "b", "--wait", "20"],
                         stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True,
                         env={**os.environ, "BOOTH_DATA_DIR": str(data),
                              "BOOTH_URL": "http://booth.invalid"})
    import time
    time.sleep(3)
    answer_pick(b, "winner", "A")
    out, err = r.communicate(timeout=30)
    assert r.returncode == OK, err
    json.loads(out)          # ONE document, or this raises


def test_marks_reports_a_reader_failure_instead_of_printing_garbage(booth):
    """A traceback on stdout with exit 0 is the worst of both: the caller's `jq`
    sees success and gets nothing. A read that could not happen is its own
    answer and gets its own code."""
    data, b = booth
    (b / ".marks.json").write_bytes(b"\xff\xfe not utf-8 at all")
    r = run(data, "marks", "b")
    assert r.returncode == READER_FAILED, f"rc={r.returncode} out={r.stdout!r}"


def test_answer_distinguishes_a_crash_from_an_unanswered_pick(booth):
    """`answer` funnelled a reader crash and "not yet answered" through the same
    exit 1, so `--wait` spun for the full hour on a broken file and then blamed
    the operator for not answering."""
    data, b = booth
    _declare(b)
    r = run(data, "answer", "b", "winner")
    assert r.returncode == UNANSWERED

    (b / ".marks.json").write_bytes(b"\xff\xfe not utf-8 at all")
    r = run(data, "answer", "b", "winner", "--wait", "6")
    assert r.returncode == READER_FAILED, (
        "a crash was read as 'unanswered' and waited out the timeout"
    )


def test_answer_on_a_note_id_says_no_such_pick(booth):
    """`answer` matched on id alone while the web route filters on shape, so a
    note id was reported 'unanswered' and polled forever — a question that could
    never be answered because it was never a question."""
    data, b = booth
    import sys
    sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
    from booth.marks import write_note
    write_note(b, "a.png", "just a note")

    r = run(data, "answer", "b", "note-1")
    assert r.returncode == NO_SUCH_PICK
    assert "no such pick" in r.stderr


# ---- U5: self-announcing booths ---------------------------------------------


def _manifest(booth_dir):
    import sys
    sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
    from booth.manifest import read_manifest
    return read_manifest(booth_dir)


def test_new_announces_the_booth(tmp_path):
    """`$ALTHING_HANDLE` is the whole provenance story: the session already has
    it, so the booth can say who made it without anybody typing a name."""
    env = {**os.environ, "ALTHING_HANDLE": "shutter-dev"}
    r = subprocess.run([str(SCRIPT), "new", "r18-ab", "--why", "pick the winner"],
                       capture_output=True, text=True, timeout=30,
                       env={**env, "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 0, r.stderr
    m = _manifest(tmp_path / "r18-ab")
    assert m.handle == "shutter-dev"
    assert m.why == "pick the winner"


def test_new_without_a_why_is_still_legal(tmp_path):
    """The flags are optional and existing call sites keep working. A booth
    that says only who made it is still a booth that said something."""
    r = subprocess.run([str(SCRIPT), "new", "scratch"], capture_output=True,
                       text=True, timeout=30,
                       env={**os.environ, "ALTHING_HANDLE": "booth-dev",
                            "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 0, r.stderr
    m = _manifest(tmp_path / "scratch")
    assert m.handle == "booth-dev" and m.why == ""


def test_add_announces_and_still_copies_the_files(tmp_path):
    """`add` is the verb most sessions actually use — it creates the booth AND
    fills it — so the why has to ride on it or it rides nowhere."""
    src = tmp_path / "src"
    src.mkdir()
    (src / "a.txt").write_text("content")
    r = subprocess.run([str(SCRIPT), "add", "r18-ab", str(src / "a.txt"),
                        "--why", "second pass", "--title", "R18 A/B"],
                       capture_output=True, text=True, timeout=30,
                       env={**os.environ, "ALTHING_HANDLE": "booth-dev",
                            "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 0, r.stderr
    assert (tmp_path / "r18-ab" / "a.txt").read_text() == "content"
    m = _manifest(tmp_path / "r18-ab")
    assert m.why == "second pass" and m.title == "R18 A/B"


def test_add_re_announcing_keeps_the_original_created(tmp_path):
    """The common shape: `new` opens the booth, `add` drops the second batch and
    sharpens the why. The booth appeared once."""
    env = {**os.environ, "ALTHING_HANDLE": "booth-dev",
           "BOOTH_DATA_DIR": str(tmp_path), "BOOTH_URL": "http://booth.invalid"}
    src = tmp_path / "a.txt"
    src.write_text("x")
    subprocess.run([str(SCRIPT), "new", "b", "--why", "first"], check=True,
                   capture_output=True, timeout=30, env=env)
    first = _manifest(tmp_path / "b").created
    subprocess.run([str(SCRIPT), "add", "b", str(src), "--why", "sharper"],
                   check=True, capture_output=True, timeout=30, env=env)

    after = _manifest(tmp_path / "b")
    assert after.created == first
    assert after.why == "sharper"


def test_the_link_board_announces_itself_as_the_booths_own(tmp_path):
    """No exemption list. The standing board is made by the service and posted
    to by seventeen handles, so no single agent owns it — `booth` is the
    truthful answer, and it keeps the rule to one line."""
    r = subprocess.run([str(SCRIPT), "link", "http://example.invalid", "a thing"],
                       capture_output=True, text=True, timeout=30,
                       env={**os.environ, "ALTHING_HANDLE": "booth-dev",
                            "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 0, r.stderr
    m = _manifest(tmp_path / "links")
    assert m is not None and m.handle == "booth"
    assert m.why


def test_the_flags_can_sit_on_either_side_of_the_files(tmp_path):
    """`booth add b *.png --why "..."` and `booth add b --why "..." *.png` both
    work. A glob is usually last and a flag usually after it, but nothing
    enforces that and a session should not have to remember which."""
    src = tmp_path / "a.png"
    src.write_bytes(b"x")
    env = {**os.environ, "ALTHING_HANDLE": "booth-dev",
           "BOOTH_DATA_DIR": str(tmp_path), "BOOTH_URL": "http://booth.invalid"}
    for name, args in (("after", ["add", "after", str(src), "--why", "w"]),
                       ("before", ["add", "before", "--why", "w", str(src)])):
        r = subprocess.run([str(SCRIPT), *args], capture_output=True, text=True,
                           timeout=30, env=env)
        assert r.returncode == 0, r.stderr
        assert _manifest(tmp_path / name).why == "w"
        assert (tmp_path / name / "a.png").exists(), "the files stopped being copied"


def test_a_why_survives_quotes_and_non_ascii_and_is_flattened(tmp_path):
    """The reason this goes through manifest.py instead of printf-ing JSON from
    the shell: a why containing a quote, a backslash or a newline is not an edge
    case, it is a sentence somebody wrote. Newlines flatten because the field
    renders inside a card's sub-line."""
    r = subprocess.run(
        [str(SCRIPT), "new", "b", "--why", 'he said "pick v3" — line1\nline2 · ünï'],
        capture_output=True, text=True, timeout=30,
        env={**os.environ, "ALTHING_HANDLE": "booth-dev",
             "BOOTH_DATA_DIR": str(tmp_path), "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 0, r.stderr
    why = _manifest(tmp_path / "b").why
    assert why == 'he said "pick v3" — line1 line2 · ünï'


def test_a_flag_with_no_value_does_not_eat_the_booth_name(tmp_path):
    """`booth new b --why` with nothing after it must not consume `b` as the
    value and then create a booth called nothing. Usage, and no directory."""
    r = subprocess.run([str(SCRIPT), "new", "b", "--why"], capture_output=True,
                       text=True, timeout=30,
                       env={**os.environ, "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode == 2
    assert "usage:" in r.stderr
    assert not (tmp_path / "b").exists()


def test_a_bare_add_does_not_wipe_the_why_the_new_set(tmp_path):
    """`booth new x --why "..."` then `booth add x out/*.png` is THE sequence,
    and the second call must not erase the first one's sentence. The module
    distinguishes omitted from empty; the shell has to carry that distinction
    across, which means an UNSET variable, not an empty one."""
    env = {**os.environ, "ALTHING_HANDLE": "booth-dev",
           "BOOTH_DATA_DIR": str(tmp_path), "BOOTH_URL": "http://booth.invalid"}
    src = tmp_path / "a.png"
    src.write_bytes(b"x")

    subprocess.run([str(SCRIPT), "new", "b", "--why", "pick the denoiser",
                    "--title", "R18 A/B"],
                   check=True, capture_output=True, timeout=30, env=env)
    subprocess.run([str(SCRIPT), "add", "b", str(src)],
                   check=True, capture_output=True, timeout=30, env=env)

    m = _manifest(tmp_path / "b")
    assert m.why == "pick the denoiser", "a bare `booth add` wiped the why"
    assert m.title == "R18 A/B"


def test_an_explicitly_empty_why_still_clears_it(tmp_path):
    """Omitted means unchanged; supplied-and-empty means the poster meant to
    take it back. Both have to be reachable from the shell."""
    env = {**os.environ, "ALTHING_HANDLE": "booth-dev",
           "BOOTH_DATA_DIR": str(tmp_path), "BOOTH_URL": "http://booth.invalid"}
    subprocess.run([str(SCRIPT), "new", "b", "--why", "wrong"], check=True,
                   capture_output=True, timeout=30, env=env)
    subprocess.run([str(SCRIPT), "new", "b", "--why", ""], check=True,
                   capture_output=True, timeout=30, env=env)

    assert _manifest(tmp_path / "b").why == ""


def test_answer_and_marks_agree_about_what_open_means(tmp_path):
    """U2 made `_is_open` THE openness predicate — "nothing else may spell this
    out" — and `booth answer`'s reader spelled it out anyway, as
    `if m.answer is None`. So a PARTIALLY answered pick read as done to
    `answer` and still-open to `marks --wait`: one verb returns the half-filled
    form and the other blocks on the same booth at the same instant.

    Found 2/4. The two verbs are the session's whole view of the loop, and a
    session that asks both gets two answers.
    """
    import sys
    sys.path.insert(0, str(pathlib.Path(__file__).parent.parent))
    from booth.marks import answer_pick, declare_pick

    b = tmp_path / "b"
    b.mkdir()
    declare_pick(b, "batch", {
        "title": "R18",
        "questions": [
            {"key": "q1", "prompt": "One?", "options": ["keep", "drop"]},
            {"key": "q2", "prompt": "Two?", "options": ["keep", "drop"]},
        ],
    })
    answer_pick(b, "batch", {"q1": "keep", "q2": None})      # partial

    env = {**os.environ, "BOOTH_DATA_DIR": str(tmp_path),
           "BOOTH_URL": "http://booth.invalid"}
    marks = subprocess.run([str(SCRIPT), "marks", "b"], capture_output=True,
                           text=True, timeout=30, env=env)
    answer = subprocess.run([str(SCRIPT), "answer", "b", "batch"],
                            capture_output=True, text=True, timeout=30, env=env)

    still_open = "batch" in json.loads(marks.stdout)["open"]
    assert still_open, "a partial answer stopped counting as open"
    assert answer.returncode == UNANSWERED, (
        "`answer` called a partially-answered pick done while `marks` called it open"
    )


def test_answer_does_not_poll_forever_on_a_pick_that_cannot_be_answered(tmp_path):
    """The mirror failure. A pick whose declaration went bad hydrates with
    `error` set, which makes it NOT open — so `marks --wait` returns at once
    while `answer --wait` polled the full hour against a form the web route
    refuses with a 400. Nothing was ever going to land."""
    b = tmp_path / "b"
    b.mkdir()
    (b / ".marks.json").write_text(json.dumps({
        "version": 1,
        "marks": [{"id": "broken", "shape": "pick", "declaration": {},
                   "error": "pick has no declaration",
                   "created": "2026-09-21T00:00:00.000000+00:00"}],
    }))

    r = subprocess.run([str(SCRIPT), "answer", "b", "broken", "--wait", "8"],
                       capture_output=True, text=True, timeout=40,
                       env={**os.environ, "BOOTH_DATA_DIR": str(tmp_path),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode != 0
    assert "broken" in r.stderr.lower() or "cannot" in r.stderr.lower()


# ---- U6: benches ------------------------------------------------------------
#
# The CLI half of the unit. `docs/contracts/u6_benches.contract.md`.

REFUSED = 2

# Shared with tests/test_benches.py::BOOTH_URL_TABLE — INV-2 says ONE predicate
# decides what a booth URL is, and these are the rows the CLI must agree on.
# A second `/b/` check inlined in the shell for speed goes red HERE.
from test_benches import BOOTH_URL_TABLE  # noqa: E402
from booth.benches import normalize_bench_url as normalize_bench_url_cli  # noqa: E402


@pytest.mark.parametrize("url,is_booth", [(u, e is not None) for u, e in BOOTH_URL_TABLE])
def test_link_refuses_exactly_what_booth_target_matches(booth, url, is_booth):
    """INV-2. Defeating change: a `case "$url" in *':8090/b/'*)` in the shell,
    which would classify the host-agnostic and percent-encoded rows differently
    from the Python predicate the board's dead marker uses."""
    data, _ = booth
    r = run(data, "link", url, "a description")
    assert (r.returncode == REFUSED) is is_booth, (url, r.returncode, r.stderr)


def test_a_refused_link_writes_nothing_at_all(booth):
    """INV-3. Defeating change: putting the refusal AFTER the `mkdir -p` /
    announce block, which is where it would naturally land if written without
    thinking. Asserting only that links.md lacks the row would PASS under that
    change — so this asserts the board directory does not exist."""
    data, _ = booth
    board = data / "links"
    assert not board.exists()
    before = sorted(p.name for p in data.iterdir())
    r = run(data, "link", "http://10.100.10.50:8090/b/some-booth/", "nope")
    assert r.returncode == REFUSED
    assert not board.exists(), "a refused link created the board directory"
    # NOTHING AT ALL, not just no board. Asserting only `links/`'s absence let
    # a refusal that touched `.benches.lock` (or any other sidecar) on its way
    # out stay green — the cold panel's vacuity pass named exactly that.
    assert sorted(p.name for p in data.iterdir()) == before, "a refused link wrote something"


def test_the_refusal_names_the_alternative(booth):
    """The teaching moment belongs at the point of use: 17 handles have the
    muscle memory, and a bare 'refused' sends them to a human."""
    data, _ = booth
    r = run(data, "link", "http://10.100.10.50:8090/b/some-booth/", "nope")
    out = r.stderr + r.stdout
    assert "--why" in out and "some-booth" in out


def test_a_reference_bookmark_is_still_a_link(booth):
    """The board keeps its residual job. Measured: ~14 of the 35 distinct
    non-booth targets are repos, model cards and docs, for which the board is
    the right and only home. A second refusal would break that."""
    data, _ = booth
    r = run(data, "link", "https://gitea.phasefinal.com/vh/peedlar", "the repo")
    assert r.returncode == OK, r.stderr
    assert "the repo" in (data / "links" / "links.md").read_text()


def test_bench_add_is_an_upsert(booth):
    data, _ = booth
    for i in range(3):
        r = run(data, "bench", "add", "https://talk.nh3.phasefinal.com:8092/", f"talk v{i}")
        assert r.returncode == OK, r.stderr
    r = run(data, "bench", "ls")
    assert r.returncode == OK, r.stderr
    assert r.stdout.count("talk v") == 1 and "talk v2" in r.stdout
    # THE ID, WHOLE AND UNTRUNCATED, because it is the locator `bench state`
    # and `bench rm` take. An earlier version of this test had a docstring
    # claiming `bench ls` prints ids and asserted nothing of the kind, while
    # the code printed a url truncated to 52 columns — a claim standing in for
    # evidence, which is how the drift would have survived CI. Found by all
    # four cold arms independently.
    bid = normalize_bench_url_cli("https://talk.nh3.phasefinal.com:8092/")
    assert bid in r.stdout, r.stdout
    # and what ls prints is addressable, end to end
    line = [l for l in r.stdout.splitlines() if "talk v2" in l][0]
    printed_id = line.split()[-1]
    assert run(data, "bench", "state", printed_id, "promoted").returncode == OK


def test_bench_verbs_round_trip(booth):
    data, _ = booth
    assert run(data, "bench", "add", "http://x.test/", "ex").returncode == OK
    assert run(data, "bench", "state", "http://x.test/", "promoted").returncode == OK
    assert "promoted" in run(data, "bench", "ls").stdout
    assert run(data, "bench", "rm", "http://x.test/").returncode == OK
    assert "ex" not in run(data, "bench", "ls").stdout


def test_bench_state_and_rm_take_an_id_or_a_url(booth):
    """`bench ls` prints ids; the operator has the URL. Both must address."""
    data, _ = booth
    run(data, "bench", "add", "http://x.test/p/", "ex")
    assert run(data, "bench", "state", "http://x.test/p/", "retired").returncode == OK
    assert run(data, "bench", "rm", "http://x.test/p/").returncode == OK


def test_bench_add_refuses_a_bad_url_with_the_reason(booth):
    data, _ = booth
    r = run(data, "bench", "add", "ftp://x.test/f", "ex")
    assert r.returncode != OK
    assert "http" in (r.stderr + r.stdout).lower()


def test_bare_bench_names_the_bench_verbs(booth):
    """Seam review SR-6: `bench` is the first two-word verb in this script, and
    falling through to the generic usage hides which word was wrong."""
    data, _ = booth
    r = run(data, "bench")
    assert r.returncode != OK
    assert "add" in r.stderr and "import" in r.stderr


def _seed_board(data):
    board = data / "links"
    board.mkdir(parents=True, exist_ok=True)
    (board / "links.md").write_text(
        "- [a booth](http://10.100.10.50:8090/b/gone/) <sub>· x · 2026-09-01 00:00</sub>\n"
        "- [talk](https://talk.nh3.phasefinal.com:8092/) <sub>· x · 2026-09-01 00:00</sub>\n"
        "- [talk again](https://talk.nh3.phasefinal.com:8092/) <sub>· x · 2026-09-02 00:00</sub>\n"
        "- [a repo](https://gitea.phasefinal.com/vh/peedlar) <sub>· x · 2026-09-03 00:00</sub>\n"
        "- [bad](ftp://x.test/f) <sub>· x · 2026-09-04 00:00</sub>\n"
    )
    return board


def test_import_writes_nothing_without_apply(booth):
    """INV-8. A proposal that writes is not a proposal."""
    data, _ = booth
    board = _seed_board(data)
    before = (board / "links.md").read_text()
    r = run(data, "bench", "import")
    assert r.returncode == OK, r.stderr
    assert not (data / ".benches.json").exists()
    assert (board / "links.md").read_text() == before


def test_import_classifies_into_three_groups(booth):
    data, _ = booth
    _seed_board(data)
    out = run(data, "bench", "import").stdout
    assert "gone" in out          # the booth row, skipped
    assert "talk" in out          # a candidate
    assert "ftp://x.test/f" in out  # refused, with its reason
    # THE RAW URL BESIDE THE NORMALIZED ID, which is the entire point of the
    # proposal: five rows of `talk` collapsing to one is only checkable if you
    # can see which raw URLs produced the one id. This printed the description
    # instead, so the collapse was invisible in the one place it had to be
    # visible. All four cold arms found it.
    assert out.count("https://talk.nh3.phasefinal.com:8092/") >= 2, out


def test_import_apply_collapses_the_repost(booth):
    data, _ = booth
    _seed_board(data)
    assert run(data, "bench", "import", "--apply").returncode == OK
    ls = run(data, "bench", "ls").stdout
    # ONE ROW, counted by line: "talk" appears in both the name and the
    # hostname, so a substring count would read 2 for a correctly collapsed row.
    assert len([l for l in ls.splitlines() if "talk" in l]) == 1, ls
    assert "peedlar" in ls
    assert "gone" not in ls, "a booth row was imported as a bench"


def test_nothing_in_the_unit_touches_links_md(booth):
    """INV-8. Defeating change: `import --apply` tidying up the rows it
    consumed. The whole CLI surface runs against one board and the file must
    come out byte-identical."""
    import hashlib
    data, _ = booth
    board = _seed_board(data)
    before = hashlib.sha256((board / "links.md").read_bytes()).hexdigest()
    run(data, "link", "http://10.100.10.50:8090/b/x/", "refused")
    run(data, "bench", "import")
    run(data, "bench", "import", "--apply")
    run(data, "bench", "add", "http://new.test/", "new")
    run(data, "bench", "state", "http://new.test/", "retired")
    run(data, "bench", "ls")          # a read verb can truncate too
    run(data, "bench", "rm", "http://new.test/")
    after = hashlib.sha256((board / "links.md").read_bytes()).hexdigest()
    assert before == after


def test_link_fails_CLOSED_when_the_booth_check_cannot_run(booth, tmp_path):
    """A guard that fails open is not a guard. If `booth.links` cannot be
    imported, `booth link` must post NOTHING and say why — not append the row
    it could not classify, and not abort with a bare traceback.

    Defeating change: dropping the `|| pred_rc=$?` handling, which under
    `set -e` aborts with a Python traceback (safe, but unactionable), or
    treating a failed check as "not a booth" (unsafe — fails open)."""
    data, _ = booth
    lone = tmp_path / "lone" / "scripts"
    lone.mkdir(parents=True)
    (lone / "booth").write_text(SCRIPT.read_text())
    (lone / "booth").chmod(0o755)
    r = subprocess.run([str(lone / "booth"), "link", "https://ok.test/x", "a bookmark"],
                       capture_output=True, text=True, cwd="/tmp", timeout=30,
                       env={**os.environ, "BOOTH_DATA_DIR": str(data),
                            "BOOTH_URL": "http://booth.invalid"})
    assert r.returncode != OK
    assert "could not check" in r.stderr, r.stderr
    assert not (data / "links" / "links.md").exists(), "a row landed despite an unusable check"