booth/tests/test_asks.py

"""Picks: a session poses a multiple-choice question; the operator answers it in
the browser; the answer lands where the session reads it.

A `pick` is one shape of MARK (see tests/test_marks.py and booth/marks.py). What
stays here is what did not move: `normalize_ask`, the declaration validator, and
`build_answer`, which together carry the operator-settled 2026-09-09 semantics —
plus the page and route integration, retargeted from the two-sidecars-per-question
storage that marks replaced.
"""
import json
import pathlib

import pytest
from fastapi.testclient import TestClient

from booth.app import build_gallery, create_app, list_booths
from booth.asks import (
    ANSWER_SUFFIX,
    ASK_SUFFIX,
    AskError,
    build_answer,
    normalize_ask,
)
from booth.marks import (
    answer_pick,
    declare_pick,
    import_legacy_asks,
    marks_for,
    open_marks,
)


def _ask(booth, stem="winner", **kw):
    """Declare a pick, the way a session does now."""
    doc = {"prompt": "Which render wins?", "options": ["A — baseline", "B — async"]}
    doc.update(kw)
    booth.mkdir(parents=True, exist_ok=True)
    declare_pick(booth, stem, doc)
    return booth


def _sidecar(booth, stem="winner", **kw):
    """Write a LEGACY `<stem>.ask.json`. Only for the tests that are about the
    legacy files themselves — they are still excluded from the item list, and
    still importable."""
    doc = {"prompt": "Which render wins?", "options": ["A — baseline", "B — async"]}
    doc.update(kw)
    booth.mkdir(parents=True, exist_ok=True)
    (booth / f"{stem}{ASK_SUFFIX}").write_text(json.dumps(doc))
    return booth


@pytest.fixture
def client(tmp_path):
    app = create_app(tmp_path, ttl_hours=24, start_sweeper=False)
    return TestClient(app), tmp_path


# ---- normalisation ----------------------------------------------------------


def test_normalize_string_options():
    a = normalize_ask({"prompt": " Pick ", "options": ["x", "y"]}, "s")
    assert a["prompt"] == "Pick"
    assert a["options"] == [{"id": "x", "label": "x", "detail": ""}, {"id": "y", "label": "y", "detail": ""}]
    assert a["notes"] is True and a["notes_label"] == "notes"


def test_normalize_object_options_and_flags():
    a = normalize_ask(
        {"prompt": "p", "options": [{"id": "a", "label": "A", "detail": "d"}, {"label": "B"}],
         "notes": False, "notes_label": "why"},
        "s",
    )
    assert a["options"][0] == {"id": "a", "label": "A", "detail": "d"}
    assert a["options"][1] == {"id": "B", "label": "B", "detail": ""}
    assert a["notes"] is False and a["notes_label"] == "why"


@pytest.mark.parametrize(
    "doc",
    [
        {"options": ["a", "b"]},
        {"prompt": "", "options": ["a", "b"]},
        {"prompt": "p", "options": ["only"]},
        {"prompt": "p", "options": "a,b"},
        {"prompt": "p", "options": ["a", "a"]},
        {"prompt": "p", "options": [{"id": "a"}, "b"]},
        {"prompt": "p", "options": ["a", "b"], "notes": "yes"},
        [],
    ],
)
def test_normalize_rejects(doc):
    with pytest.raises(AskError):
        normalize_ask(doc, "s")


# ---- files ------------------------------------------------------------------


def test_a_malformed_declaration_is_refused(tmp_path):
    """The unreadable-FILE case moved to the legacy importer, which surfaces it
    as a broken mark rather than raising — see test_marks.py. What is left here
    is the declaration itself being wrong, which is refused at the door."""
    with pytest.raises(AskError):
        normalize_ask("not an object", "x")
    with pytest.raises(AskError):
        declare_pick(tmp_path, "x", {"prompt": "no options"})


def test_marks_for_folds_answer_and_surfaces_errors(tmp_path):
    _ask(tmp_path, "one")
    _ask(tmp_path, "two")
    (tmp_path / f"broken{ASK_SUFFIX}").write_text("[]")
    (tmp_path / ".hidden.ask.json").write_text("{}")  # dotfiles never listed
    answer_pick(tmp_path, "two", "B — async", "less banding", who="10.0.0.1")

    by = {m.id: m for m in marks_for(tmp_path)}
    assert set(by) == {"one", "two"}          # the broken SIDECAR is not a mark
    assert by["one"].answer is None and by["one"].error is None
    assert by["two"].answer["choice"] == "B — async"
    assert by["two"].answer["choice_index"] == 1
    assert by["two"].answer["notes"] == "less banding"
    assert by["two"].answer["answered_by"] == "10.0.0.1"

    # The broken legacy sidecar is not silently swallowed either — importing it
    # lands a mark carrying the error, so a question the session believes it
    # posted stays visible instead of vanishing.
    import_legacy_asks(tmp_path)
    broken = next(m for m in marks_for(tmp_path) if m.id == "broken")
    assert broken.error and broken.options == []


def test_answer_validates_the_choice_that_was_made(tmp_path):
    _sidecar(tmp_path)
    with pytest.raises(AskError):
        _shape("C — nope")
    with pytest.raises(AskError):
        _shape("A — baseline", doc={"prompt": "p", "options": ["only"]})
    ans = _shape("A — baseline", notes="  ok \r\n")
    assert ans["notes"] == "ok"
    assert ans["answered_at"]
    assert not (tmp_path / f"winner{ANSWER_SUFFIX}.tmp").exists()
    # re-answer overwrites — the sidecar is the CURRENT answer, not a log
    assert _shape("B — async")["choice_index"] == 1


def test_answer_drops_notes_when_the_pick_disables_them(tmp_path):
    _sidecar(tmp_path, notes=False)
    assert _shape("A — baseline", doc=dict(SINGLE, notes=False), notes="ignored")["notes"] == ""


def test_declare_pick_roundtrip_and_id_guard(tmp_path):
    declare_pick(tmp_path / "b", "pick",
                 {"prompt": "Pick one", "options": ["x", {"id": "y", "label": "Y"}], "notes": False})
    a = next(m for m in marks_for(tmp_path / "b") if m.id == "pick")
    assert [o["id"] for o in a.options] == ["x", "y"] and a.notes_enabled is False
    for bad in ("../x", ".hidden", "a/b", ""):
        with pytest.raises(AskError):
            declare_pick(tmp_path / "b", bad, {"prompt": "p", "options": ["a", "b"]})
    with pytest.raises(AskError):
        declare_pick(tmp_path / "b", "ok", {"prompt": "p", "options": ["solo"]})


# ---- gallery + index integration -------------------------------------------


def test_gallery_hides_legacy_ask_and_answer_files(tmp_path):
    """The legacy sidecars are never deleted (the ROADMAP says so), so they are
    still on disk in live booths and must still not render as tiles."""
    b = _sidecar(tmp_path / "b")
    (b / "a.png").write_bytes(b"x")
    (b / f"winner{ANSWER_SUFFIX}").write_text(json.dumps({"stem": "winner"}))
    names = {it["name"] for it in build_gallery(b)}
    assert names == {"a.png"}


def test_list_booths_counts_open_asks(tmp_path):
    b = _ask(tmp_path / "b", "one")
    _ask(b, "two")
    answer_pick(b, "two", "A — baseline")
    (tmp_path / "plain").mkdir()
    by = {x["name"]: x for x in list_booths(tmp_path, 3600)}
    assert by["b"]["marks_open"] == 1 and by["b"]["marks_total"] == 2
    assert by["plain"]["marks_open"] == 0 and by["plain"]["marks_total"] == 0
    assert by["b"]["count"] == 0  # ask/answer files are not "items"


# ---- routes -----------------------------------------------------------------


def test_booth_page_renders_open_ask_as_form(client):
    c, data = client
    _ask(data / "b")
    html = c.get("/b/b/").text
    assert "Which render wins?" in html
    assert 'type="radio"' in html and 'name="choice"' in html
    assert 'value="B — async"' in html
    assert 'action="/b/b/answer"' in html
    assert "<textarea" in html
    assert "1 open" in html


def test_answer_route_records_the_pick_and_page_shows_it(client):
    c, data = client
    _ask(data / "b")
    r = c.post("/b/b/answer", data={"ask": "winner", "choice": "B — async", "notes": "less banding"},
               follow_redirects=False)
    assert r.status_code == 303 and r.headers["location"] == "/b/b/#mark-winner"
    ans = _answer_of(data / "b", "winner")
    assert ans["choice"] == "B — async" and ans["notes"] == "less banding"
    assert ans["answered_by"]  # TestClient's client addr
    html = c.get("/b/b/").text
    assert "answered" in html and "less banding" in html
    assert "1 open" not in html
    # a session on ANOTHER host reads the judgment over HTTP — the capability the
    # per-stem sidecar used to carry, now one request for the whole booth
    doc = c.get("/b/b/marks.json").json()
    assert doc["open"] == []
    assert doc["marks"][0]["answer"]["choice"] == "B — async"


def test_answer_route_rejects_bad_choice_and_unknown_ask(client):
    c, data = client
    _ask(data / "b")
    assert c.post("/b/b/answer", data={"ask": "winner", "choice": "Z"}).status_code == 400
    assert c.post("/b/b/answer", data={"ask": "nosuch", "choice": "A — baseline"}).status_code == 404
    assert c.post("/b/b/answer", data={"ask": "../x", "choice": "A — baseline"}).status_code == 404
    assert not (data / "b" / f"winner{ANSWER_SUFFIX}").exists()


def test_answer_json_404s_until_answered(client):
    c, data = client
    _ask(data / "b")
    assert c.get("/b/b/winner.answer.json").status_code == 404


def test_notes_field_hidden_when_disabled(client):
    c, data = client
    _ask(data / "b", notes=False)
    html = c.get("/b/b/").text
    assert 'name="notes"' not in html          # the pick's free-text field
    assert 'name="text"' in html               # the add-a-note control stays


def test_index_card_shows_open_mark_badge(client):
    c, data = client
    _ask(data / "b")
    html = c.get("/").text
    assert "1 open" in html


# ---- multi-question asks ----------------------------------------------------


MULTI = {
    "title": "R18 batch review",
    "questions": [
        {"key": "r1", "prompt": "Render 1?", "options": ["keep", "drop"], "notes": True},
        {"key": "r2", "prompt": "Render 2?", "options": [{"id": "k", "label": "keep"}, {"id": "d", "label": "drop"}]},
    ],
    "notes": True,
}


def _multi(booth, stem="batch", **kw):
    """Declare a multi-question pick, the way a session does now."""
    doc = json.loads(json.dumps(MULTI)); doc.update(kw)
    booth.mkdir(parents=True, exist_ok=True)
    declare_pick(booth, stem, doc)
    return booth


SINGLE = {"prompt": "Which render wins?", "options": ["A — baseline", "B — async"]}


def _shape(choice, doc=None, stem="winner", **kw):
    """`build_answer` over a normalized declaration — the 2026-09-09 semantics
    with no storage under them."""
    return build_answer(normalize_ask(json.loads(json.dumps(doc or SINGLE)), stem), choice, **kw)


def _answer_of(booth, mark_id):
    """The recorded judgment for one pick — read back through marks, which is the
    one read path now that `<stem>.answer.json` is gone."""
    m = next(x for x in marks_for(booth) if x.id == mark_id)
    return m.answer


def _multi_sidecar(booth, stem="batch", **kw):
    """The LEGACY multi sidecar — for the tests that are about the legacy files
    themselves (still excluded from the item list, still importable)."""
    doc = json.loads(json.dumps(MULTI)); doc.update(kw)
    booth.mkdir(parents=True, exist_ok=True)
    (booth / f"{stem}{ASK_SUFFIX}").write_text(json.dumps(doc))
    return booth


def test_normalize_multi():
    a = normalize_ask(MULTI, "batch")
    assert a["multi"] is True and a["title"] == "R18 batch review"
    assert [q["key"] for q in a["questions"]] == ["r1", "r2"]
    assert a["questions"][0]["notes"] is True and a["questions"][1]["notes"] is False
    assert a["questions"][1]["options"][0] == {"id": "k", "label": "keep", "detail": ""}
    # single stays single, and exposes ONE question with key None
    s = normalize_ask({"prompt": "p", "options": ["a", "b"]}, "s")
    assert s["multi"] is False and s["questions"][0]["key"] is None


@pytest.mark.parametrize(
    "doc",
    [
        {"questions": []},
        {"questions": [{"prompt": "p", "options": ["a", "b"]}]},                       # no key
        {"questions": [{"key": "bad key", "prompt": "p", "options": ["a", "b"]}]},
        {"questions": [{"key": "x", "prompt": "p", "options": ["a", "b"]},
                       {"key": "x", "prompt": "q", "options": ["a", "b"]}]},           # dup key
        {"questions": [{"key": "x", "prompt": "p", "options": ["only"]}]},
        {"prompt": "p", "options": ["a", "b"], "questions": [{"key": "x", "prompt": "p", "options": ["a", "b"]}]},
    ],
)
def test_normalize_multi_rejects(doc):
    with pytest.raises(AskError):
        normalize_ask(doc, "s")


def test_multi_accepts_a_partial_answer(tmp_path):
    """Blanks are legal (operator ruling 2026-09-09): refusing the whole
    submission because one of four was skipped threw away the three that were
    made."""
    _multi_sidecar(tmp_path)
    a = _shape({"r1": "keep"}, MULTI, "batch")                     # r2 not submitted at all
    assert a["complete"] is False and a["unanswered"] == ["r2"]
    assert list(a["answers"]) == ["r1"]
    b = _shape({"r1": "keep", "r2": ""}, MULTI, "batch")           # r2 an empty radio group
    assert b["unanswered"] == ["r2"] and b["complete"] is False
    # a note without a pick is still worth keeping
    c = _shape({"r1": "", "r2": "k"}, MULTI, "batch", qnotes={"r1": "undecided"})
    assert c["answers"]["r1"] == {"prompt": "Render 1?", "choice": None,
                                  "choice_index": None, "label": "", "notes": "undecided"}
    assert c["unanswered"] == ["r1"]
    # nothing at all is refused: it would flip the ask to answered with no decision
    with pytest.raises(AskError):
        _shape({"r1": "", "r2": ""}, MULTI, "batch")
    # ...but notes alone are a real submission
    d = _shape({"r1": "", "r2": ""}, MULTI, "batch", notes="ask me tomorrow")
    assert d["complete"] is False and d["notes"] == "ask me tomorrow" and d["answers"] == {}


def test_single_ask_may_be_answered_with_notes_only(tmp_path):
    _sidecar(tmp_path)
    with pytest.raises(AskError):
        answer_pick(tmp_path, "winner", "")
    a = _shape("", notes="neither is right, rerun")
    assert a["choice"] is None and a["complete"] is False
    assert a["notes"] == "neither is right, rerun"


def test_multi_still_rejects_a_bad_option(tmp_path):
    _multi_sidecar(tmp_path)
    with pytest.raises(AskError):
        _shape({"r1": "keep", "r2": "nope"}, MULTI, "batch")
    with pytest.raises(AskError):
        _shape("keep", MULTI, "batch")                             # wrong shape
    ans = _shape({"r1": "drop", "r2": "k"}, MULTI, "batch", notes="overall fine",
                       qnotes={"r1": "banding", "r2": "ignored: notes off"})
    assert list(ans["answers"]) == ["r1", "r2"]
    assert ans["answers"]["r1"] == {"prompt": "Render 1?", "choice": "drop", "choice_index": 1,
                                    "label": "drop", "notes": "banding"}
    assert ans["answers"]["r2"]["choice"] == "k" and ans["answers"]["r2"]["notes"] == ""
    assert ans["notes"] == "overall fine" and ans["title"] == "R18 batch review"


def test_multi_page_and_route(client):
    c, data = client
    _multi(data / "b")
    html = c.get("/b/b/").text
    assert "R18 batch review" in html and "2 questions" in html
    assert 'name="choice.r1"' in html and 'name="choice.r2"' in html
    assert 'name="notes.r1"' in html and 'name="notes.r2"' not in html
    assert 'name="notes"' in html
    # a partial submission is RECORDED, not refused
    assert c.post("/b/b/answer", data={"ask": "batch", "choice.r1": "keep"},
                  follow_redirects=False).status_code == 303
    part = _answer_of(data / "b", "batch")
    assert part["complete"] is False and part["unanswered"] == ["r2"]
    assert "1/2" in c.get("/b/b/").text and "partial" in c.get("/b/b/").text
    r = c.post("/b/b/answer", data={"ask": "batch", "choice.r1": "keep", "notes.r1": "crisp",
                                    "choice.r2": "d", "notes": "ship r1"}, follow_redirects=False)
    assert r.status_code == 303
    ans = _answer_of(data / "b", "batch")
    assert ans["answers"]["r1"]["choice"] == "keep" and ans["answers"]["r1"]["notes"] == "crisp"
    assert ans["answers"]["r2"]["choice"] == "d" and ans["notes"] == "ship r1"
    html = c.get("/b/b/").text
    assert "answered" in html and "crisp" in html and "ship r1" in html


def test_declare_pick_accepts_a_full_multi_doc(tmp_path):
    declare_pick(tmp_path / "b", "batch", MULTI)
    assert next(m for m in marks_for(tmp_path / "b") if m.id == "batch").multi is True
    with pytest.raises(AskError):
        declare_pick(tmp_path / "b", "bad", {"questions": []})


# ---- verbatim-index booths ---------------------------------------------------
#
# A booth's own index.html is served VERBATIM, so the inline asks panel can never
# render on it. Found 2026-09-09 on `emmie-anchor`: a valid ask, listed by the
# CLI, invisible on the page with nothing to say so. The fix is a chip injected
# into the verbatim page plus a standalone /asks page that carries the forms.


def test_verbatim_booth_renders_the_ask_inline(client):
    c, data = client
    b = _ask(data / "b")
    (b / "index.html").write_text("<!doctype html><title>report</title><body>hi</body>")
    html = c.get("/b/b/").text
    assert "hi" in html                          # the report is still served verbatim
    assert "Which render wins?" in html          # ...with the ask ON it, not elsewhere
    assert 'type="radio"' in html and 'action="/b/b/answer"' in html
    assert "bk-ask" in html                      # self-contained fragment styles
    assert "booth-nav-asks" in html              # chip remains, as a jump link
    assert "#bk-ask-winner-top" in html


def test_verbatim_chip_disappears_once_answered(client):
    c, data = client
    b = _ask(data / "b")
    (b / "index.html").write_text("<!doctype html><body>hi</body>")
    answer_pick(b, "winner", "A — baseline")
    assert "booth-nav-asks" not in c.get("/b/b/").text


def test_verbatim_booth_without_asks_is_untouched(client):
    c, data = client
    (data / "b").mkdir()
    (data / "b" / "index.html").write_text("<!doctype html><body>hi</body>")
    assert "booth-nav-asks" not in c.get("/b/b/").text


def test_asks_page_renders_forms_and_answers_back_to_itself(client):
    c, data = client
    b = _ask(data / "b")
    (b / "index.html").write_text("<!doctype html><body>hi</body>")
    page = c.get("/b/b/marks").text
    assert "Which render wins?" in page and 'type="radio"' in page
    assert 'name="back" value="marks"' in page
    r = c.post("/b/b/answer", data={"ask": "winner", "choice": "B — async", "back": "marks"},
               follow_redirects=False)
    assert r.headers["location"] == "/b/b/marks#mark-winner"
    assert _answer_of(b, "winner")["choice"] == "B — async"
    assert "answered" in c.get("/b/b/marks").text


def test_asks_page_on_a_booth_with_none(client):
    c, data = client
    (data / "b").mkdir()
    assert "no marks" in c.get("/b/b/marks").text


def test_asks_page_404s_for_unknown_booth(client):
    c, _ = client
    assert c.get("/b/nope/asks").status_code == 404


def test_single_ask_keeps_its_title(tmp_path):
    a = normalize_ask({"title": "emmie — pick the anchor", "prompt": "Which?",
                       "options": ["a", "b"]}, "s")
    assert a["multi"] is False and a["title"] == "emmie — pick the anchor"
    with pytest.raises(AskError):
        normalize_ask({"title": 7, "prompt": "p", "options": ["a", "b"]}, "s")


def test_asks_page_shows_a_single_ask_title(client):
    c, data = client
    _ask(data / "b", title="emmie — pick the anchor")
    assert "emmie — pick the anchor" in c.get("/b/b/marks").text


# ---- inline placement in a verbatim report -----------------------------------
#
# Operator verdict 2026-09-09 on the separate /asks page: "the asks should be
# inline with the artifacts, not on a separate page." A four-voice audition wants
# each voice's radio group under that voice's audio, and one submit for the lot.


REPORT = """<!doctype html><title>audition</title><body>
<h1>Three voices</h1>
<section id="lawson"><audio src="a.wav"></audio>
<div data-booth-ask="batch:r1"></div></section>
<section id="jo"><audio src="b.wav"></audio>
<!-- booth:ask batch:r2 --></section>
<div data-booth-ask-submit="batch"></div>
</body>"""


def test_per_question_placeholders_land_where_the_author_put_them(client):
    c, data = client
    b = _multi(data / "b")
    (b / "index.html").write_text(REPORT)
    html = c.get("/b/b/").text
    # each group is inside its own section, in document order
    lawson = html.index('id="lawson"')
    jo = html.index('id="jo"')
    assert lawson < html.index('name="choice.r1"') < jo
    assert jo < html.index('name="choice.r2"')
    # one shared form, bound by the HTML5 form= attribute, submitted once
    assert html.count('<form id="bk-ask-form-batch"') == 1
    assert html.count('action="/b/b/answer"') == 1
    assert html.count('form="bk-ask-form-batch"') >= 4
    # the submit block landed at its own placeholder, not appended after </body>
    assert html.index("bk-ask-form-batch") < html.index("</body>")


def test_inline_form_submits_every_question_in_one_post(client):
    c, data = client
    b = _multi(data / "b")
    (b / "index.html").write_text(REPORT)
    r = c.post("/b/b/answer", data={"ask": "batch", "choice.r1": "keep", "notes.r1": "crisp",
                                    "choice.r2": "d", "notes": "ship r1"}, follow_redirects=False)
    assert r.status_code == 303
    ans = _answer_of(b, "batch")
    assert ans["answers"]["r1"]["choice"] == "keep" and ans["answers"]["r2"]["choice"] == "d"
    # and the recorded pick now shows inline, on the report itself
    html = c.get("/b/b/").text
    assert "recorded:" in html and "bk-done" in html
    assert 'value="keep" required  checked' in html.replace("\n", " ") or "checked" in html


def test_whole_ask_placeholder_renders_everything_there(client):
    c, data = client
    b = _ask(data / "b")
    (b / "index.html").write_text('<!doctype html><body><p>x</p><div data-booth-ask="winner"></div></body>')
    html = c.get("/b/b/").text
    assert html.index("Which render wins?") > html.index("<p>x</p>")
    assert html.index("bk-ask-go") < html.index("</body>")     # submit placed inline too


def test_placeholder_for_a_missing_ask_is_left_alone(client):
    c, data = client
    b = _ask(data / "b")
    (b / "index.html").write_text('<!doctype html><body><div data-booth-ask="typo"></div></body>')
    html = c.get("/b/b/").text
    assert 'data-booth-ask="typo"' in html          # author's markup untouched, not blanked
    assert "Which render wins?" in html             # the real ask still appended, never lost


def test_questions_placed_without_a_submit_still_get_one(client):
    c, data = client
    b = _multi(data / "b")
    (b / "index.html").write_text('<!doctype html><body><div data-booth-ask="batch:r1"></div></body>')
    html = c.get("/b/b/").text
    assert html.count('<form id="bk-ask-form-batch"') == 1     # appended, so it is submittable
    assert 'name="choice.r2"' in html                          # r2 unplaced -> must still appear


def test_styles_are_emitted_once(client):
    c, data = client
    b = _multi(data / "b")
    (b / "index.html").write_text(REPORT)
    assert c.get("/b/b/").text.count(".bk-ask-opt:has(input:checked)") == 1


def test_radios_are_not_html_required_anywhere(client):
    """The browser must not block a partial submit — `required` on a radio group
    is exactly what stopped the operator leaving one blank."""
    c, data = client
    b = _multi(data / "b")
    assert "required" not in c.get("/b/b/").text
    (b / "index.html").write_text('<!doctype html><body><div data-booth-ask="batch"></div></body>')
    assert "required" not in c.get("/b/b/").text
    assert "required" not in c.get("/b/b/marks").text


def test_partial_answer_renders_as_skipped_inline(client):
    c, data = client
    b = _multi(data / "b")
    (b / "index.html").write_text('<!doctype html><body><div data-booth-ask="batch"></div></body>')
    c.post("/b/b/answer", data={"ask": "batch", "choice.r1": "keep"})
    html = c.get("/b/b/").text
    assert "bk-skip" in html and "left blank" in html
    assert "1 of 2 answered" in html


def test_empty_submission_is_refused_with_400(client):
    c, data = client
    b = _multi(data / "b")
    assert c.post("/b/b/answer", data={"ask": "batch", "choice.r1": "", "choice.r2": ""}).status_code == 400
    assert _answer_of(b, "batch") is None       # the pick stays OPEN, not falsely answered