# SPDX-License-Identifier: AGPL-3.0-only
# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.

"""Contracts for the update popup's release-notes preview.

The popup shows the newest GitHub release's announcement. Two risks are guarded:
showing a release the maintainers have not published, and showing a body's
generated sections as though they were the announcement."""

from __future__ import annotations

import http.server
import json
import re
import shutil
import subprocess
import sys
import threading
import time
from dataclasses import dataclass
from pathlib import Path

import pytest

REPO = Path(__file__).resolve().parents[2]
BACKEND = REPO / "studio/backend"
FRONTEND = REPO / "studio/frontend/src"
MODULE = BACKEND / "utils/release_notes.py"
BODIES = Path(__file__).parent / "fixtures/release_bodies"
PANEL = FRONTEND / "components/update/release-notes-panel.tsx"
NOTES_HOOK = FRONTEND / "hooks/use-release-notes.ts"
PREVIEW = FRONTEND / "lib/release-notes-preview.ts"
CODE_SPANS = FRONTEND / "lib/markdown-code-spans.ts"
LINKS = FRONTEND / "lib/release-body-links.ts"
LIST_COLUMNS = FRONTEND / "lib/markdown-list-columns.ts"
INLINE_COMMENTS = FRONTEND / "lib/markdown-inline-comments.ts"
WEB_BANNER = FRONTEND / "components/web/update-banner.tsx"
TAURI_BANNER = FRONTEND / "components/tauri/update-banner.tsx"

# The scanners are the frontend half of the contract the parser implements, so they are
# run rather than read. Node strips the types and nothing imports a package: no install.
_TS_ALIAS = re.compile(r'"@/lib/([a-z-]+)"')
_TS_RUNNER = """
import { resolveReleaseBodyLinks } from "./release-body-links.ts";
import { releaseNotesPreview } from "./release-notes-preview.ts";

const chunks: Buffer[] = [];
process.stdin.on("data", (chunk: Buffer) => chunks.push(chunk));
process.stdin.on("end", () => {
  const markdown = Buffer.concat(chunks).toString("utf8");
  const result =
    process.argv[2] === "links"
      ? resolveReleaseBodyLinks(markdown)
      : releaseNotesPreview(markdown);
  process.stdout.write(JSON.stringify(result));
});
"""

SAMPLE = """Intro prose, the announcement itself.

## Kimi K3

- a real section

## Updating / installing Unsloth

```bash
curl -fsSL https://unsloth.ai/install.sh | sh
```

## What's Changed

* Something by @someone in https://github.com/unslothai/unsloth/pull/1

**Full Changelog**: https://github.com/unslothai/unsloth/compare/v1...v2
"""


@dataclass(frozen = True)
class Section:
    """A heading and the lines under it, to the next heading of any level."""

    version: str
    heading: str
    body: str


def sections(module, text: str) -> list[Section]:
    """Every document-level heading in `text`, with the lines beneath it.

    The shipped scanner decides what a heading is; this only groups its events.
    """
    found: list[Section] = []
    bodies: list[list[str]] = []
    for event in module.scan_blocks(text):
        if isinstance(event, module.Heading):
            # A setext heading is the paragraph above it, already collected.
            if bodies and event.retract:
                del bodies[-1][len(bodies[-1]) - event.retract :]
            title = event.title.strip()
            found.append(Section(version = title.split()[0] if title else "", heading = title, body = ""))
            bodies.append([])
            continue
        if bodies:
            bodies[-1].append(event.line)
    return [
        Section(version = entry.version, heading = entry.heading, body = "\n".join(body).strip())
        for entry, body in zip(found, bodies)
    ]


def parse_sections(module, text: str) -> list[Section]:
    """`sections`, keeping only those whose heading starts with a version."""
    return [entry for entry in sections(module, text) if module._parse_version(entry.version)]


def find_section(module, text: str, version: str) -> Section | None:
    for entry in parse_sections(module, text):
        if entry.version == version:
            return entry
    wanted = module._parse_version(version)
    for entry in parse_sections(module, text):
        if wanted is not None and module._parse_version(entry.version) == wanted:
            return entry
    return None


def releases_payload(*entries: dict) -> str:
    """A GitHub releases response, with the fields the selector reads."""
    defaults = {
        "draft": False,
        "prerelease": False,
        "name": "",
        "body": "",
        "html_url": "",
    }
    return json.dumps([{**defaults, **entry} for entry in entries])


@pytest.fixture(scope = "module")
def notes_module():
    sys.path.insert(0, str(BACKEND))
    try:
        from utils import release_notes
    finally:
        sys.path.pop(0)
    release_notes.reset_release_notes_cache()
    yield release_notes
    release_notes.reset_release_notes_cache()


@pytest.fixture
def serve_releases(notes_module, monkeypatch):
    """Serve a releases payload locally, and point the module at it."""
    monkeypatch.delenv(notes_module.DISABLE_ENV_VAR, raising = False)
    servers: list[http.server.HTTPServer] = []

    def serve(
        body: str,
        status: int = 200,
        headers: dict[str, str] | None = None,
        reset: bool = True,
    ):
        hits = {"count": 0}

        class Handler(http.server.BaseHTTPRequestHandler):
            def do_GET(self):  # noqa: N802 - stdlib naming
                hits["count"] += 1
                payload = body.encode("utf-8")
                self.send_response(status)
                for name, value in (headers or {}).items():
                    self.send_header(name, value)
                self.send_header("Content-Length", str(len(payload)))
                self.end_headers()
                self.wfile.write(payload)

            def log_message(self, *_args):
                pass

        server = http.server.HTTPServer(("127.0.0.1", 0), Handler)
        servers.append(server)
        threading.Thread(target = server.serve_forever, daemon = True).start()
        monkeypatch.setenv(
            notes_module.RELEASES_URL_ENV_VAR,
            f"http://127.0.0.1:{server.server_port}/releases",
        )
        if reset:
            notes_module.reset_release_notes_cache()
        return hits

    yield serve
    for server in servers:
        server.shutdown()
        server.server_close()
    notes_module.reset_release_notes_cache()


@pytest.fixture
def isolated_releases(notes_module, monkeypatch):
    """Keep the module away from the network entirely."""
    monkeypatch.setenv(notes_module.DISABLE_ENV_VAR, "1")
    notes_module.reset_release_notes_cache()
    yield notes_module
    notes_module.reset_release_notes_cache()


def test_only_real_headings_become_sections(notes_module):
    headings = [entry.heading for entry in sections(notes_module, SAMPLE)]
    # The heading inside the fenced install sample is not one of them.
    assert headings == ["Kimi K3", "Updating / installing Unsloth", "What's Changed"]


def test_section_body_stops_at_the_next_heading(notes_module):
    entry = sections(notes_module, SAMPLE)[0]
    assert "a real section" in entry.body
    assert "install.sh" not in entry.body


def test_the_announcement_survives_and_the_generated_sections_do_not(notes_module):
    stripped = notes_module.strip_release_body(SAMPLE)
    assert "Intro prose" in stripped
    assert "## Kimi K3" in stripped and "a real section" in stripped
    for gone in (
        "Updating / installing Unsloth",
        "install.sh",
        "What's Changed",
        "pull/1",
        "Full Changelog",
    ):
        assert gone not in stripped


def test_response_reports_no_notes_without_markdown(isolated_releases):
    """Update checks are off, so there is no release and nothing to show."""
    payload = isolated_releases.get_release_notes("2026.7.7")
    assert payload["matched"] is False
    assert payload["markdown"] is None
    assert payload["version"] == "2026.7.7"
    # The UI still needs somewhere to send the user.
    assert payload["release_notes_url"]


def test_the_offered_version_is_echoed_not_looked_up(notes_module, serve_releases):
    """No tag could match the PyPI version the pip popup offers, so it comes
    back untouched for the UI to match a stale answer against."""
    serve_releases(
        releases_payload(
            {
                "tag_name": "v0.1.60-beta",
                "name": "Meta Muse Glimmer",
                "body": "The announcement.\n",
                "html_url": "https://github.com/unslothai/unsloth/releases/tag/v0.1.60-beta",
                "published_at": "2026-08-10T11:59:46Z",
            }
        )
    )
    payload = notes_module.get_release_notes("2026.8.11")
    assert payload["version"] == "2026.8.11"
    assert payload["tag"] == "v0.1.60-beta"
    assert payload["heading"] == "Meta Muse Glimmer"
    assert payload["html_url"].endswith("/releases/tag/v0.1.60-beta")
    assert payload["matched"] is True and payload["source"] == "github"
    assert "The announcement." in payload["markdown"]


def test_unsupported_version_query_is_rejected(isolated_releases):
    assert isolated_releases.is_supported_version_query("2026.7.6") is True
    for bad in ("../etc/passwd", "2026.7.6 OR 1", "", "a" * 80):
        assert isolated_releases.is_supported_version_query(bad) is False
    assert isolated_releases.get_release_notes("../etc/passwd")["matched"] is False


def test_the_newest_published_release_wins(notes_module, serve_releases):
    """Ordered by publication, never by tag: v0.1.60-beta was published after
    v0.1.527-beta, so any numeric or SemVer sort picks the wrong one."""
    serve_releases(
        releases_payload(
            {
                "tag_name": "v0.1.527-beta",
                "body": "older",
                "published_at": "2026-08-09T17:14:42Z",
            },
            {
                "tag_name": "v0.1.60-beta",
                "body": "newer",
                "published_at": "2026-08-10T11:59:46Z",
            },
        )
    )
    payload = notes_module.get_release_notes("2026.8.11")
    assert payload["tag"] == "v0.1.60-beta"
    assert "newer" in payload["markdown"]


@pytest.mark.parametrize(
    "entry",
    [
        # A draft whose tag the filter accepts, so the flag must reject it.
        {"tag_name": "v9.9.9", "draft": True},
        # A desktop build, which is where the drafts come from.
        {"tag_name": "desktop-v0.1.60-beta"},
        # llama.cpp prebuilts and the legacy month tags are ordinary releases.
        {"tag_name": "b8475"},
        {"tag_name": "February-2026"},
    ],
)
def test_only_a_published_studio_release_is_shown(notes_module, serve_releases, entry):
    serve_releases(
        releases_payload(
            {"body": "not an announcement", "published_at": "2026-08-11T00:00:00Z", **entry},
            {
                "tag_name": "v0.1.60-beta",
                "body": "the announcement",
                "published_at": "2026-08-10T11:59:46Z",
            },
        )
    )
    payload = notes_module.get_release_notes("2026.8.11")
    assert payload["tag"] == "v0.1.60-beta"
    assert "not an announcement" not in (payload["markdown"] or "")


@pytest.mark.parametrize("body", ['{"message": "Not Found"}', "[]", "not json at all"])
def test_a_payload_without_releases_is_an_error_not_a_crash(notes_module, serve_releases, body):
    serve_releases(body)
    payload = notes_module.get_release_notes("2026.8.11")
    assert payload["matched"] is False
    assert payload["error"], "the UI needs to know it can retry"


def test_a_release_with_no_announcement_shows_none(notes_module, serve_releases):
    """v0.1.527-beta's body is only the generated list, so nothing survives
    stripping: the popup links out rather than showing an older release."""
    serve_releases(
        releases_payload(
            {
                "tag_name": "v0.1.527-beta",
                "name": "Unsloth v0.1.527-beta",
                "body": (BODIES / "v0.1.527-beta.md").read_text(encoding = "utf-8"),
                "html_url": "https://github.com/unslothai/unsloth/releases/tag/v0.1.527-beta",
                "published_at": "2026-08-09T17:14:42Z",
            },
            {
                "tag_name": "v0.1.526-beta",
                "body": "An earlier announcement.\n",
                "published_at": "2026-08-04T16:06:43Z",
            },
        )
    )
    payload = notes_module.get_release_notes("2026.8.10")
    assert payload["matched"] is False and payload["markdown"] is None
    # Still the release it found, so the popup can name it and link to it.
    assert payload["tag"] == "v0.1.527-beta"
    assert payload["html_url"].endswith("/releases/tag/v0.1.527-beta")
    assert payload["error"] is None, "no notes is not a failure"


def test_longer_outer_fence_does_not_leak_a_fake_section(notes_module):
    """A ``` sample inside a ```` block must not close the block and let the
    sample's heading be indexed as a real release."""
    text = "## 1.0\n\n````md\n```\n## 9.9.9\n```\n````\n\n- real note\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    assert find_section(notes_module, text, "9.9.9") is None


def test_tilde_fence_is_not_closed_by_backticks(notes_module):
    text = "## 1.0\n\n~~~\n```\n## 9.9.9\n~~~\n\n- real\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]


def test_utf8_bom_does_not_hide_the_first_section(notes_module):
    """Editors on Windows can leave a BOM on the first line."""
    assert [e.version for e in parse_sections(notes_module, "\ufeff## 1.0\n\n- x\n")] == ["1.0"]


@pytest.mark.parametrize("newline", ["\r\n", "\r"])
def test_non_unix_line_endings(notes_module, newline):
    text = f"## 1.0{newline}{newline}- windows note{newline}"
    entry = find_section(notes_module, text, "1.0")
    assert entry is not None and "windows note" in entry.body
    assert "\r" not in entry.body


def test_closing_fence_must_carry_nothing_after_it(notes_module):
    """CommonMark: a closer is the delimiter plus whitespace only. A ```` line
    with trailing text inside a ```` block is content, not the end."""
    text = "## 1.0\n\n````md\n```` not a closer\n## 9.9.9\n````\n\n- real\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    # An opening fence may still carry an info string.
    info = "## 1.0\n\n```python\n## 9.9.9\n```\n\n- real\n"
    assert [e.version for e in parse_sections(notes_module, info)] == ["1.0"]


@pytest.mark.parametrize(
    "text",
    [
        "## 1.0\n\n- real\n\n<!--\n## 9.9.9\n\n- unpublished\n-->\n",
        "## 1.0\n\n- real\n\n<!-- ## 9.9.9 -->\n",
    ],
)
def test_commented_out_sections_are_not_releases(notes_module, text):
    """Markdown does not render them, so they are not published notes."""
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    assert find_section(notes_module, text, "9.9.9") is None


def test_no_changelog_file_is_packaged_or_read():
    """The releases are the only source now. A file left in the packaging would
    be a second one, editable in a checkout and stale in a wheel."""
    assert not (REPO / "CHANGELOG.md").exists()
    assert not (REPO / "_changelog_build.py").exists()
    for name in ("pyproject.toml", "build.sh", ".gitignore"):
        assert "CHANGELOG.md" not in (REPO / name).read_text(encoding = "utf-8")
    source = MODULE.read_text(encoding = "utf-8")
    # "Full Changelog" is the footer line it strips; a file is what must be gone.
    assert "CHANGELOG.md" not in source and "changelog.py" not in source


def test_preview_keeps_identifier_underscores():
    """UNSLOTH_DISABLE_UPDATE_CHECK must not render as UNSLOTHDISABLEUPDATECHECK."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "BOLD_UNDERSCORE" in src and "ITALIC_UNDERSCORE" in src
    assert "parkCodeSpans" in src, "code spans are parked so their underscores survive"
    assert "const EMPHASIS" not in src, "the blanket emphasis strip is gone"


def test_panel_prefers_the_page_the_notes_came_from():
    """The page the notes came from wins over the caller's URL and the changelog."""
    src = PANEL.read_text(encoding = "utf-8")
    assert "notes?.htmlUrl ?? releaseNotesUrl ?? notes?.releaseNotesUrl" in src


def test_remote_failure_is_reported_so_the_ui_can_retry(notes_module, monkeypatch):
    """An unreachable GitHub is retryable; "no notes published" is not."""
    monkeypatch.delenv(notes_module.DISABLE_ENV_VAR, raising = False)
    # Port 9 (discard) refuses fast, standing in for an unreachable host.
    monkeypatch.setenv(notes_module.RELEASES_URL_ENV_VAR, "http://127.0.0.1:9/releases")
    notes_module.reset_release_notes_cache()
    try:
        payload = notes_module.get_release_notes("2.0")
        assert payload["matched"] is False
        assert payload["error"], "remote failure must reach the UI"
    finally:
        notes_module.reset_release_notes_cache()


def test_preview_keeps_comparison_operators():
    """The tag strip must keep the operators in "Support Python <3.15 and >3.9"."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "/<\\/?[a-zA-Z][^>]*>/g" in src, "tag strip must require a name character"


def test_preview_hides_commented_out_notes():
    """Unpublished notes inside <!-- --> are not rendered, so not previewed."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "stripCommentSpans" in src and "COMMENT_OPEN" in src


def test_hook_treats_a_reported_failure_as_retryable():
    src = NOTES_HOOK.read_text(encoding = "utf-8")
    assert "next.error !== null" in src


def test_comment_delimiter_in_inline_code_is_literal(notes_module):
    """A note documenting `<!--` used to swallow every release below it."""
    text = "## 2.0\n\n- Type `<!--` to begin a comment\n\n## 1.0\n\n- older\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    assert find_section(notes_module, text, "1.0") is not None
    assert "older" not in find_section(notes_module, text, "2.0").body


def test_refresh_retries_a_cached_remote_failure(notes_module, serve_releases):
    """Retry must reach the network again rather than replay the cached failure."""
    hits = serve_releases("", status = 500)
    notes_module.get_release_notes("2.0")
    notes_module.get_release_notes("2.0")
    assert hits["count"] == 1, "the failure should be cached"
    notes_module.get_release_notes("2.0", refresh = True)
    assert hits["count"] == 2, "refresh must bypass the cached failure"


def test_a_rate_limit_is_not_retried_until_it_resets(notes_module, serve_releases):
    """A shared IP that has spent its 60 requests an hour gains nothing by
    retrying: the request is refused and only pushes the reset further away."""
    reset = str(int(time.time()) + 900)
    hits = serve_releases(
        '{"message": "API rate limit exceeded"}',
        status = 403,
        headers = {"X-RateLimit-Remaining": "0", "X-RateLimit-Reset": reset},
    )
    payload = notes_module.get_release_notes("2.0")
    assert payload["matched"] is False and "rate limit" in payload["error"].lower()
    notes_module.get_release_notes("2.0", refresh = True)
    assert hits["count"] == 1, "refresh must not bypass a rate-limit lockout"


def test_a_rate_limit_deadline_is_bounded_not_just_its_first_wait(notes_module):
    """GitHub says not to request again before X-RateLimit-Reset, so the reset
    wins over the back-off. Only the first wait used to be bounded, so the fetch
    after it answered from the raw header and a skewed value parked the popup."""
    import email.message
    import urllib.error

    def refused(seconds_out: float):
        headers = email.message.Message()
        headers["X-RateLimit-Remaining"] = "0"
        headers["X-RateLimit-Reset"] = str(int(time.time() + seconds_out))
        return urllib.error.HTTPError("url", 403, "rate limited", headers, None)

    ceiling = notes_module.RELEASES_RATE_LIMIT_MAX_SECONDS
    for seconds_out in (ceiling, 365 * 24 * 60 * 60):
        notes_module.reset_release_notes_cache()
        _, first = notes_module._http_error_source(refused(seconds_out))
        # The wait the next fetch answers with, once the first one has expired.
        _, next_wait = notes_module._fetch_latest_release()
        assert first <= ceiling and next_wait <= ceiling
    # A reset inside the ceiling is honoured rather than rounded up to it.
    notes_module.reset_release_notes_cache()
    _, short = notes_module._http_error_source(refused(120))
    assert 60 <= short <= 180


def test_every_refusal_records_a_deadline_retry_has_to_wait_out(notes_module):
    """A secondary limit answers 403 or 429 with no `X-RateLimit-Remaining: 0`,
    and at most a `Retry-After`. Only the primary path recorded a deadline, so
    Retry dropped the cached failure and requested straight back into it."""
    import email.message
    import urllib.error

    def refused(code: int, **headers: str):
        message = email.message.Message()
        for name, value in headers.items():
            message[name] = value
        return urllib.error.HTTPError("url", code, "refused", message, None)

    ceiling = notes_module.RELEASES_RATE_LIMIT_MAX_SECONDS
    cases = [
        # Nothing to go on: the plain back-off, so Retry still has to wait.
        (refused(429), notes_module.RELEASES_RATE_LIMITED_TTL_SECONDS),
        # Retry-After wins, being how a secondary limit states its wait.
        (refused(403, **{"Retry-After": "120"}), 120),
        (
            refused(403, **{"Retry-After": "45", "X-RateLimit-Remaining": "0"}),
            45,
        ),
    ]
    for error, expected in cases:
        notes_module.reset_release_notes_cache()
        _, ttl = notes_module._http_error_source(error)
        assert notes_module._rate_limited_until > time.time(), "no lockout recorded"
        assert abs(ttl - expected) <= 2 and ttl <= ceiling


def test_the_page_asked_for_fits_under_the_read_cap(notes_module, serve_releases):
    """A release entry carries its whole body, so the page size and the byte cap
    are one decision: the endpoint's maximum of 100 is near 4 MiB against a
    2 MiB cap, and the fetch then fails outright."""
    import urllib.parse

    query = urllib.parse.urlparse(notes_module.RELEASES_API_URL).query
    per_page = int(urllib.parse.parse_qs(query)["per_page"][0])
    # The largest real body checked in here, as the size of every entry.
    largest = max(len(path.read_text(encoding = "utf-8")) for path in BODIES.glob("*.md"))
    full_page = [
        {
            "tag_name": f"v0.1.{index}-beta",
            "body": "x" * largest,
            "published_at": f"2026-08-{index % 28 + 1:02d}T00:00:00Z",
        }
        for index in range(per_page)
    ]
    payload = releases_payload(*full_page)
    assert len(payload) < notes_module.RELEASES_MAX_BYTES, (
        f"a full page of {per_page} is {len(payload) / 1024 / 1024:.1f} MiB "
        f"against a {notes_module.RELEASES_MAX_BYTES / 1024 / 1024:.0f} MiB cap"
    )
    serve_releases(payload)
    assert notes_module.get_release_notes("2026.8.11")["error"] is None


@pytest.mark.parametrize(
    "heading",
    ["### macOS, Linux, WSL:", "### macOS / Linux / WSL", "### macOS/Linux/WSL"],
)
def test_platform_headings_split_on_a_slash_as_well_as_a_comma(notes_module, heading):
    """The install block splits its commands across per-platform headings, whose
    separator is written either way."""
    body = (
        "The announcement.\n\n"
        "### To update Unsloth or install a new Unsloth Studio, you must use:\n\n"
        f"{heading}\n\n```\ncurl -fsSL https://unsloth.ai/install.sh | sh\n```\n\n"
        "### Kimi K3\n\n- a real change\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert "install.sh" not in stripped and "macOS" not in stripped
    assert "### Kimi K3" in stripped and "a real change" in stripped


def test_a_cached_release_answers_an_unchanged_response(notes_module, serve_releases):
    """GitHub answers a conditional request with 304 and no body, which is the
    release already held rather than a failure."""
    serve_releases(
        releases_payload(
            {
                "tag_name": "v0.1.60-beta",
                "body": "The announcement.\n",
                "published_at": "2026-08-10T11:59:46Z",
            }
        ),
        headers = {"ETag": '"abc"'},
    )
    assert notes_module.get_release_notes("2.0")["matched"] is True
    serve_releases("", status = 304, reset = False)
    # Expired, not reset: the ETag and last good release must carry over.
    notes_module._remote_cache.expires_at = 0
    payload = notes_module.get_release_notes("2.0")
    assert payload["matched"] is True and payload["tag"] == "v0.1.60-beta"


def test_hook_never_returns_another_versions_notes():
    """State still describes the previous version until the effect runs."""
    src = NOTES_HOOK.read_text(encoding = "utf-8")
    assert "notes.version === version" in src
    assert "load(version, true)" in src, "retry must ask the backend to bypass its cache"


@pytest.mark.parametrize("indent", ["", " ", "  ", "   "])
def test_headings_and_fences_allow_commonmark_indentation(notes_module, indent):
    """Markdown renders up to three leading spaces, so the parser must agree."""
    text = f"## 1.0\n\nOne.\n\n{indent}## 2.0\n\nTwo.\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0", "2.0"]
    fenced = f"## 1.0\n\n{indent}```\n{indent}## 9.9.9\n{indent}```\n\n- real\n"
    assert [e.version for e in parse_sections(notes_module, fenced)] == ["1.0"]


def test_four_space_indentation_is_code_not_structure(notes_module):
    """At four spaces Markdown switches to indented code, for both forms."""
    assert [
        e.version for e in parse_sections(notes_module, "    ## 9.9.9\n\n## 1.0\n\n- real\n")
    ] == ["1.0"]
    assert [
        e.version
        for e in parse_sections(notes_module, "## 1.0\n\n    ```\n    sample\n\n## 2.0\n\n- two\n")
    ] == ["1.0", "2.0"]


def test_desktop_notes_link_to_the_release_page_on_every_platform():
    """manualReleaseUrl is Linux-package only; the rest need the release page."""
    hook = (FRONTEND / "hooks/use-tauri-update.ts").read_text(encoding = "utf-8")
    assert "const releasePageUrl = info ?" in hook
    banner = TAURI_BANNER.read_text(encoding = "utf-8")
    assert "releaseNotesUrl={releasePageUrl ?? manualReleaseUrl}" in banner
    provider = (FRONTEND / "app/provider.tsx").read_text(encoding = "utf-8")
    assert "releasePageUrl={update.releasePageUrl}" in provider


def test_preview_matches_how_markdown_renders_prose_and_links():
    """Three rendering mismatches the preview must not reintroduce: wrapped
    paragraphs split into fragments, autolinks eaten as tags, a lead cut short."""
    src = PREVIEW.read_text(encoding = "utf-8")
    # Contiguous prose lines accumulate and flush at a paragraph boundary.
    assert "collector.paragraph = collector.paragraph" in src
    # <https://x> renders as link text, so it is not a tag.
    assert "AUTOLINK" in src
    # "e.g. GGUF" is not a sentence boundary.
    assert "ABBREVIATIONS" in src and "INITIAL" in src


def test_preview_treats_code_as_literal():
    """Inside a code span, and inside an indented code block, Markdown renders
    the text literally, so the preview must not transform or promote it."""
    src = PREVIEW.read_text(encoding = "utf-8")
    # Code spans are parked before any other inline transformation.
    park = src.index("parkCodeSpans(markdown")
    assert park < src.index("stripHtmlTags(\n    parked")
    # A "- cmd" line inside an indented code block is not a headline bullet.
    assert "INDENTED_CODE_INDENT" in src


def test_desktop_updater_metadata_maps_published_field_names():
    """latest.json publishes Tauri's `notes`/`pub_date`; the manual Linux path
    must read those, not `body`/`date`, or its release notes are always empty."""
    rust = (REPO / "studio/src-tauri/src/desktop_update_policy.rs").read_text(encoding = "utf-8")
    assert 'alias = "body"' in rust and "notes: Option<String>" in rust
    assert 'alias = "date"' in rust and "pub_date: Option<String>" in rust
    assert "body: metadata.notes" in rust and "date: metadata.pub_date" in rust
    workflow = (REPO / ".github/workflows/release-desktop.yml").read_text(encoding = "utf-8")
    assert "'notes': notes," in workflow, "workflow no longer publishes `notes`"


def test_backend_exposes_release_notes_route():
    src = (BACKEND / "main.py").read_text(encoding = "utf-8")
    assert '@app.get("/api/studio/release-notes")' in src
    assert "is_supported_version_query" in src


def test_panel_is_scrollable_and_shows_only_the_stripped_notes():
    src = PANEL.read_text(encoding = "utf-8")
    assert "overflow-y-auto" in src, "release notes must scroll inside the popup"
    assert "max-h-" in src, "the scroller needs a bounded height"
    # latest.json's `notes` is install boilerplate, the same every release.
    assert "fallbackMarkdown" not in src
    assert "notes?.matched ? notes.markdown : null" in src


def test_notes_surface_is_borderless_and_lifts_in_dark_mode():
    src = PANEL.read_text(encoding = "utf-8")
    assert "border border-border" not in src, "the notes box is a fill, not a bordered box"
    # Lighter than the card behind it, rather than a darker inset.
    assert "dark:bg-white/[0.06]" in src
    # Streamdown's mt-6 clips the first heading against the scroller edge.
    assert "[&>*>*:first-child]:mt-0" in src
    # Shared utility: thumb hidden until the notes are hovered.
    assert "hover-scrollbar" in src
    # Streamdown renders code at text-sm, twice this panel's body size.
    assert "[&_code]:text-[0.92em]" in src


def test_hook_discards_notes_for_a_different_version():
    src = NOTES_HOOK.read_text(encoding = "utf-8")
    assert "notesVersion !== version" in src


def test_collapsed_panel_previews_the_top_bullets():
    """Collapsed popups show the headline changes without an extra click."""
    preview = PREVIEW.read_text(encoding = "utf-8")
    assert "RELEASE_NOTES_PREVIEW_ITEMS = 4" in preview
    # Wrapped bullets join into one item, or a preview ends mid-sentence.
    assert "collectBullets" in preview and "flush" in preview
    # Nested list items are detail, not headline changes.
    assert "NESTED_INDENT_TOLERANCE" in preview
    # Tag stripping repeats: one pass turns `<<b>b>` back into a live tag.
    assert "while (out !== previous)" in preview

    panel = PANEL.read_text(encoding = "utf-8")
    assert "releaseNotesPreview" in panel
    assert 'data-testid="update-release-notes-summary"' in panel
    # Fetched when the popup appears: the collapsed preview needs them too.
    assert "enabled: true" in panel


def test_preview_highlights_the_leading_sentence():
    """Each bullet leads with its headline sentence, emphasised over the rest."""
    preview = PREVIEW.read_text(encoding = "utf-8")
    assert "splitLeadSentence" in preview
    # A period inside "unsloth.ai" or "e.g." must not read as a break.
    assert "SENTENCE_BREAK" in preview and "(?=" in preview

    panel = PANEL.read_text(encoding = "utf-8")
    assert '<span className="font-medium text-foreground">{item.lead}</span>' in panel
    assert "item.rest" in panel


@pytest.mark.parametrize("banner", [WEB_BANNER, TAURI_BANNER])
def test_update_popup_is_wider_than_the_other_overlays(banner):
    """Sized for three same-size buttons on one row. Width moved from the shared
    stack onto each overlay, so this does not widen the other overlays."""
    assert "max-w-[448px]" in banner.read_text(encoding = "utf-8")
    provider = (FRONTEND / "app/provider.tsx").read_text(encoding = "utf-8")
    assert "max-w-[400px]" not in provider, "stack must not cap overlay width"
    llama = (FRONTEND / "components/llama-update-banner.tsx").read_text(encoding = "utf-8")
    assert "max-w-[400px]" in llama, "unrelated overlays keep their width"


@pytest.mark.parametrize("banner", [WEB_BANNER, TAURI_BANNER])
def test_banners_toggle_inline_release_notes(banner):
    src = banner.read_text(encoding = "utf-8")
    assert "ReleaseNotesPanel" in src
    assert "Show release notes" in src and "Hide release notes" in src
    # Keyed by version, so a new offer cannot leave old notes on screen.
    assert "notesVersion" in src


@pytest.mark.parametrize(
    "banner,toggle,action",
    [
        (WEB_BANNER, "web-update-release-notes-toggle", "web-update-snooze-button"),
        (TAURI_BANNER, "tauri-update-release-notes-toggle", "Remind me later"),
    ],
)
def test_notes_toggle_shares_the_action_row(banner, toggle, action):
    """The toggle sits in the same row as the actions, not on its own line."""
    src = banner.read_text(encoding = "utf-8")
    row = src.index("mt-4 flex")
    assert row < src.index(toggle) < src.index(action)
    # Same type size as the actions beside it; nowrap keeps labels on one line.
    toggle_line = next(line for line in src.splitlines() if toggle in line)
    toggle_block = src[src.index("Button", row) : src.index(toggle_line)]
    assert "text-ui-13" in toggle_block and "whitespace-nowrap" in toggle_block


def test_headings_inside_a_raw_html_block_are_not_releases(notes_module):
    """<pre> content is literal, so a sample heading in it is not a section."""
    text = "## 1.0\n\n<pre>\n## 9.9.9\n</pre>\n\n- real note\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    assert "real note" in find_section(notes_module, text, "1.0").body
    assert find_section(notes_module, text, "9.9.9") is None


def test_details_blocks_still_contain_markdown(notes_module):
    """<details> is a type 6 block, so headings inside it still count."""
    text = "## 2.0\n\n<details>\n<summary>More</summary>\n\n- note\n\n</details>\n\n## 1.0\n\n- older\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]


def test_inline_raw_html_tag_does_not_open_a_block(notes_module):
    """A block opens only at the start of a line; a tag mid-sentence is inline."""
    text = "## 2.0\n\n- Warn when a <script> tag is pasted\n\n## 1.0\n\n- older\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]


def test_preview_skips_raw_html_blocks():
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "stripRawHtml" in src
    # Anchored: only a line-leading tag opens a block, matching the parser.
    assert "/^ {0,3}<(pre|script|style|textarea)" in src


def test_fence_inside_a_raw_html_block_is_literal(notes_module):
    """A stray ``` in a <pre> sample is literal; as a fence it hid later releases."""
    text = "## 2.0\n\n<pre>\n```\n</pre>\n\n## 1.0\n\n- older\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]


def test_raw_html_block_closes_on_any_of_the_four_tags(notes_module):
    """A type 1 block ends at the first of the four closers, matched or not."""
    text = '## 1.0\n\n<script>\nconst sample = "</pre>";\n## 9.9.9\n</script>\n'
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0", "9.9.9"]


@pytest.mark.parametrize("tag", ["details", "div", "table"])
def test_type_6_blocks_run_until_a_blank_line(notes_module, tag):
    """`<details>` holds Markdown only after a blank line closes the block."""
    packed = f"## 1.0\n\n<{tag}>\n## 9.9.9\n</{tag}>\n\n- note\n"
    assert [e.version for e in parse_sections(notes_module, packed)] == ["1.0"]
    spaced = f"## 1.0\n\n<{tag}>\n\n## 2.0\n\n- note\n"
    assert [e.version for e in parse_sections(notes_module, spaced)] == ["1.0", "2.0"]


def test_a_tag_only_line_cannot_interrupt_a_paragraph(notes_module):
    """Type 7 blocks do not interrupt a paragraph."""
    text = "## 2.0\n\nSome prose.\n<span>\n\n## 1.0\n\n- older\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]


def test_preview_joins_an_indented_continuation_line():
    """Four spaces only start code outside a paragraph; inside one it is a wrap."""
    src = PREVIEW.read_text(encoding = "utf-8")
    # Measured from the line's container, so an item's own indent does not count.
    assert "!insideBlock && line.indent - line.column >= INDENTED_CODE_INDENT" in src
    # A fence indented into a list item is a block, not a wrapped line.
    assert "opensDeepFence" in src


def test_preview_code_spans_need_a_matching_closer():
    """A closer is a run of the same length, so the inner backticks survive."""
    src = CODE_SPANS.read_text(encoding = "utf-8")
    assert "candidate === ticks" in src, "a closer is a run of the same length"
    assert "stripPadding" in src, "one space of padding is dropped, as in Markdown"


def test_preview_skips_thematic_breaks():
    """`- - -` renders as a rule, so it must not take a preview slot."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "THEMATIC_BREAK" in src
    assert "THEMATIC_BREAK.test(visible)" in src


def test_preview_keeps_quoted_examples_out_of_the_headlines():
    """A quoted list is example output, not a change."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "quoted: boolean" in src
    assert "if (!line.quoted)" in src, "quoted bullets never become headlines"


def test_notes_panel_keeps_the_link_when_the_lookup_fails():
    """The release page can be reachable when the backend lookup is not."""
    src = PANEL.read_text(encoding = "utf-8")
    error_branch = src[src.index('if (state === "error")') :]
    retry = error_branch.index("update-release-notes-retry")
    assert error_branch.index("{link}") > retry, "link sits beside retry"


def test_hook_waits_for_the_desktop_auth_token():
    """A token not installed yet must not be recorded as a failed lookup."""
    src = NOTES_HOOK.read_text(encoding = "utf-8")
    assert "hasAuthToken()" in src and "AUTH_POLL_LIMIT" in src


def test_a_body_staged_as_a_comment_reads_as_unpublished(notes_module, serve_releases):
    """A release drafted inside <!-- --> renders as nothing, so it is unpublished."""
    serve_releases(
        releases_payload(
            {
                "tag_name": "v2.0",
                "body": "<!-- not ready -->\n",
                "published_at": "2026-08-10T00:00:00Z",
            }
        )
    )
    staged = notes_module.get_release_notes("2.0")
    assert staged["matched"] is False and staged["markdown"] is None
    assert staged["source"] is None, "nothing was shown, so nothing sourced it"


@pytest.mark.parametrize(
    "body,visible",
    [
        ("- note", True),
        ("<!-- staged -->", False),
        ("```\n```", True),
        ("<pre>\n</pre>", True),
        ("  ", False),
    ],
)
def test_visibility_check_only_hides_comments(notes_module, body, visible):
    assert notes_module._renders_visibly(body) is visible


@pytest.mark.parametrize(
    "block",
    [
        "<?php\n## 9.9.9\n?>",
        "<![CDATA[\n## 9.9.9\n]]>",
        "<!DOCTYPE\n## 9.9.9\n>",
    ],
)
def test_processing_instructions_and_declarations_are_literal(notes_module, block):
    """Raw block types 3 to 5 render literally, so a heading in one is a sample."""
    text = f"## 1.0\n\n{block}\n\n- real note\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    assert "real note" in find_section(notes_module, text, "1.0").body


def test_headings_need_a_space_or_tab_after_the_hashes(notes_module):
    """A non-breaking space after the hashes renders as text, not a heading."""
    text = "## 1.0\n\n- real note\n\n## 9.9.9\n\n- not a release\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    assert find_section(notes_module, text, "9.9.9") is None
    # A tab is valid and still opens a heading.
    tabbed = "## 1.0\n\n- one\n\n##\t2.0\n\n- two\n"
    assert [e.version for e in parse_sections(notes_module, tabbed)] == ["1.0", "2.0"]


def test_preview_skips_every_raw_block_form():
    """The extractor tracks the same block forms as the parser."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "RAW_BLOCKS" in src
    assert "CDATA" in src and "[A-Za-z]" in src


@pytest.mark.parametrize("banner", [WEB_BANNER, TAURI_BANNER])
def test_expanded_popup_fits_a_short_viewport(banner):
    """A window under roughly 430px used to push the card's title off screen."""
    panel = PANEL.read_text(encoding = "utf-8")
    # The notes region shrinks inside the capped card, so header and actions stay on screen.
    assert "min-h-0 flex-1" in panel, "notes height must follow the viewport"
    src = banner.read_text(encoding = "utf-8")
    assert "max-h-[calc(100dvh_-_2rem)]" in src, "card is the backstop on tiny viewports"


def test_relative_release_body_links_point_at_the_repository():
    """Repository-relative links would resolve against Studio's own origin."""
    src = LINKS.read_text(encoding = "utf-8")
    assert "https://github.com/unslothai/unsloth/blob/main/" in src
    assert "https://raw.githubusercontent.com/unslothai/unsloth/main/" in src
    # Absolute targets, fragments, fenced code and code spans stay untouched.
    assert "ABSOLUTE" in src and "codeSpans" in src and "FENCE" in src
    panel = PANEL.read_text(encoding = "utf-8")
    assert "resolveReleaseBodyLinks" in panel


@pytest.mark.parametrize("query", ["latest", "main", "not-a-version", "abc"])
def test_unparseable_versions_are_rejected(notes_module, query):
    """A query that cannot parse is a bad request, not an empty result."""
    assert notes_module.is_supported_version_query(query) is False


@pytest.mark.parametrize("query", ["2026.7.5", "v2026.7.5", "2026.07.5", "1.0.0rc1"])
def test_real_versions_are_still_accepted(notes_module, query):
    assert notes_module.is_supported_version_query(query) is True


def test_reference_style_images_resolve_to_the_raw_host():
    """An image needs the raw file: the blob URL is an HTML page."""
    src = LINKS.read_text(encoding = "utf-8")
    assert "IMAGE_REFERENCE" in src
    assert "imageLabels" in src


def test_collapsed_notes_surface_is_hidden_when_nothing_previews():
    """Notes that preview as nothing leave an empty strip, worse than none."""
    src = PANEL.read_text(encoding = "utf-8")
    assert "preview?.items.length === 0" in src


def test_a_fence_closer_accepts_only_spaces_and_tabs(notes_module):
    """A delimiter followed by a non-breaking space is content, not a closer."""
    text = "## 1.0\n\n```\n```\u00a0\n## 9.9.9\n```\n\n- real note\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    plain = "## 1.0\n\n```\nx\n```\t\n\n## 2.0\n\n- two\n"
    assert [e.version for e in parse_sections(notes_module, plain)] == ["1.0", "2.0"]
    # The same rule in both frontend scanners.
    for source in (PREVIEW, LINKS):
        assert "/[^ \\t]/" in source.read_text(encoding = "utf-8")


def test_code_spans_close_on_a_run_of_equal_length():
    """`a``b [x](y.md)` is one code span, so the link inside it is literal."""
    src = CODE_SPANS.read_text(encoding = "utf-8")
    assert "candidate === ticks" in src, "closer length must match the opener"
    # Shared, so the preview and the link resolver cannot drift apart.
    assert "markdown-code-spans" in PREVIEW.read_text(encoding = "utf-8")
    assert "markdown-code-spans" in LINKS.read_text(encoding = "utf-8")


def test_preview_decodes_entities_like_the_renderer():
    """Streamdown renders `AT&amp;T` as AT&T, so the raw entity must not show."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "NAMED_ENTITIES" in src and "decodeEntity" in src
    # Decoded before code spans are restored, so code keeps the literal text.
    assert src.index(".replace(ENTITY, decodeEntity)") < src.index(".replace(PARKED")


def test_release_notes_request_refreshes_an_expired_token():
    """A direct fetch cannot recover from a 401; authFetch refreshes first."""
    src = NOTES_HOOK.read_text(encoding = "utf-8")
    assert "authFetch(" in src
    assert "getAuthToken" not in src


def test_preview_handles_the_desktop_updater_line_endings():
    """CRLF used to hide fences and promote a code sample to a headline."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "LINE_ENDINGS" in src
    assert "LINE_ENDINGS" in LINKS.read_text(encoding = "utf-8")


def test_preview_renders_reference_links_as_text():
    """`[text][label]` renders as a link, so its raw markup must not show."""
    src = PREVIEW.read_text(encoding = "utf-8")
    assert "LINK_REFERENCE" in src and "IMAGE_REFERENCE" in src
    # A definition line renders as nothing, so it is not a preview item.
    assert "DEFINITION" in src


def test_preview_treats_escaped_punctuation_as_literal():
    """`\\*not italic\\*` keeps its stars, and an escaped backtick opens no span."""
    assert "ESCAPE" in PREVIEW.read_text(encoding = "utf-8")
    assert "escaped(" in CODE_SPANS.read_text(encoding = "utf-8")


def test_link_resolver_skips_every_code_form():
    """Indented code and cross-line code spans render as code, so leave them."""
    src = LINKS.read_text(encoding = "utf-8")
    assert "INDENTED_CODE" in src
    # Spans are scanned over the whole document, not line by line.
    assert "codeSpans(masked)" in src
    # A definition cannot interrupt a paragraph.
    assert "definition.has(index)" in src


def test_badge_links_resolve_both_targets():
    """`[![alt](img)](link)`: the outer link needs a nested label to resolve."""
    assert "NESTED_LABEL" in LINKS.read_text(encoding = "utf-8")


def test_in_flight_requests_are_identified_not_just_versioned():
    """Two requests for one version could resolve out of order."""
    assert "requestIdRef" in NOTES_HOOK.read_text(encoding = "utf-8")


def test_notes_repair_the_shared_previews_width_reset():
    """MarkdownPreview clears max-width on descendants, so wide content escapes."""
    src = PANEL.read_text(encoding = "utf-8")
    assert "[&_img]:max-w-full" in src
    assert "[&_[data-streamdown=link-safety-modal]>*]:max-w-md" in src


@pytest.mark.parametrize("banner", [WEB_BANNER, TAURI_BANNER])
def test_only_the_notes_region_scrolls(banner):
    """The dismiss control sits inside the card, so the card must not scroll."""
    src = banner.read_text(encoding = "utf-8")
    assert "flex max-h-[calc(100dvh_-_2rem)] min-h-0 flex-col overflow-hidden" in src
    assert 'className="min-h-0 flex-1"' in src
    panel = PANEL.read_text(encoding = "utf-8")
    assert "max-h-64 min-h-0 flex-1 overflow-y-auto" in panel
    # The collapsed summary scrolls too: without it the bullets were painted
    # over the row of buttons once the card's slot for them got small.
    assert "min-h-0 flex-1 space-y-1 overflow-y-auto" in panel


def test_a_comment_marker_in_prose_cannot_swallow_later_releases(notes_module):
    """A note that mentions `<!--` used to put the parser into comment state for
    the rest of the file, hiding every release below it."""
    text = (
        "## 2026.8.0\n\n- Studio strips <!-- markers from pasted prompts.\n\n"
        "## 2026.7.5\n\n- SECRET: an older release\n"
    )
    assert [e.version for e in parse_sections(notes_module, text)] == ["2026.8.0", "2026.7.5"]
    assert "SECRET" not in find_section(notes_module, text, "2026.8.0").body
    assert find_section(notes_module, text, "2026.7.5") is not None
    # A comment that starts a line is still a block and still hides its body.
    hidden = "## 2.0\n\n<!--\n## 9.9.9\n-->\n\n- note\n"
    assert [e.version for e in parse_sections(notes_module, hidden)] == ["2.0"]


def test_unmatched_backtick_runs_stay_linear(notes_module):
    """Rescanning the suffix per opener was quadratic: 800 never-closing runs
    took 7.7s at 321 KB, and notes are reparsed on every popup request."""
    line = "".join("`" * (i + 1) + "x" for i in range(800))
    assert len(line) > 300_000
    started = time.monotonic()
    assert notes_module._code_span_ranges(line) == []
    assert time.monotonic() - started < 2.0


def test_a_base_exception_releases_the_single_flight_flag(notes_module, monkeypatch):
    """The flag was cleared only after `except Exception`, so a BaseException
    stranded it and every later caller waited out the full deadline."""
    notes_module.reset_release_notes_cache()

    def explode():
        raise KeyboardInterrupt

    monkeypatch.setattr(notes_module, "_fetch_latest_release", explode)
    with pytest.raises(KeyboardInterrupt):
        notes_module.get_latest_release()
    assert notes_module._remote_fetching is False
    notes_module.reset_release_notes_cache()


@pytest.mark.parametrize("marker", ["<!-->", "<!--->"])
def test_an_empty_comment_does_not_swallow_later_releases(notes_module, marker):
    """`<!-->` and `<!--->` are complete comments: the closer overlaps the
    opener, so searching past it hid every release below."""
    text = f"## 2.0\n\n- new stuff\n\n{marker}\n\n## 1.0\n\n- old stuff\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    assert find_section(notes_module, text, "1.0") is not None
    assert "old stuff" not in find_section(notes_module, text, "2.0").body
    # The frontend scanner has to agree, or the preview and the body disagree.
    assert "!line.includes(COMMENT_CLOSE)" in PREVIEW.read_text(encoding = "utf-8")


def test_an_unterminated_comment_still_hides_the_rest(notes_module):
    """The fix must not turn every `<!--` line into a no-op block."""
    text = "## 2.0\n\n<!-- never closed\n\n## 1.0\n\n- old stuff\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0"]


def test_a_closing_delimiter_takes_its_whole_line(notes_module):
    """The closing line stays in the block, so a heading glued after it is not."""
    for text in (
        "## 1.0\n\n<!-- hidden -->## 9.9.9\n\n- note\n",
        "## 1.0\n\n<pre>\nx\n</pre>## 9.9.9\n\n- note\n",
    ):
        assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]


def test_an_exact_heading_is_never_shadowed(notes_module):
    """PEP 440 says 1.0 == 1.0.0, so the normalised match used to beat exact."""
    text = "## 1.0.0\n\n- padded\n\n## 1.0\n\n- exact\n"
    assert find_section(notes_module, text, "1.0").body == "- exact"
    assert find_section(notes_module, text, "1.0.0").body == "- padded"
    # Normalised matching still applies when there is no exact heading.
    assert find_section(notes_module, "## 2026.7.6\n\n- x\n", "2026.07.6") is not None


def test_setext_headings_are_release_boundaries(notes_module):
    """A version over a line of dashes is the same heading in setext form."""
    text = "2.0\n---\n\n- new\n\n1.0\n---\n\n- old\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    assert find_section(notes_module, text, "2.0").body == "- new"
    # A rule between sections is still a rule, and a setext h1 is not a release.
    assert [
        e.version for e in parse_sections(notes_module, "## 2.0\n\n- a\n\n---\n\n## 1.0\n\n- b\n")
    ] == ["2.0", "1.0"]


def test_a_long_backtick_run_does_not_stall_the_parser(notes_module):
    """The code-span guard used to backtrack: 20k backticks took over a minute."""
    import time

    text = "## 1.0\n\n- " + "`" * 20_000 + " <!--\n"
    started = time.perf_counter()
    parse_sections(notes_module, text)
    assert time.perf_counter() - started < 1.0


def test_the_remote_fetch_has_a_total_deadline(notes_module):
    """The socket timeout resets per read, so a trickle could hold a worker."""
    source = MODULE.read_text(encoding = "utf-8")
    assert "deadline = time.monotonic() + RELEASES_TIMEOUT_SECONDS" in source
    # read1 returns after one socket read, so the deadline is actually checked.
    assert "response.read1(" in source
    # Waiters give up rather than queue behind a stalled fetch.
    assert "Release notes are still loading." in source


def test_truncated_notes_close_their_fence(notes_module):
    """A blind slice could end inside a code block and break the rendering."""
    body = "```\n" + "x\n" * 20_000 + "```\n"
    payload = notes_module._notes_response(version = "1.0", markdown = body, source = "local")
    assert payload["truncated"] is True
    assert payload["markdown"].rstrip().endswith("```")


def test_the_opt_out_beats_the_developer_override():
    """The documented kill switch beats the dev switch, and the value must parse."""
    source = (BACKEND / "utils/update_status.py").read_text(encoding = "utf-8")
    assert "forced_version and not disabled and _is_version(forced_version)" in source


def test_a_list_item_over_dashes_is_not_a_setext_heading(notes_module):
    """`- first` over `---` is a list and a rule, not a setext heading."""
    text = "## 1.0\n\n- first\n---\n\n- second\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    body = find_section(notes_module, text, "1.0").body
    assert "first" in body and "second" in body
    # Real setext headings still work.
    setext = "2.0\n---\n\n- new\n\n1.0\n---\n\n- old\n"
    assert [e.version for e in parse_sections(notes_module, setext)] == ["2.0", "1.0"]


def test_a_backtick_in_a_fence_info_string_is_not_a_fence(notes_module):
    """A backtick fence's info string may hold no backtick, so that line is prose."""
    text = "## 2.0\n\n```bad`info\n\n## 1.0\n\n- old\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    # A tilde fence may hold backticks, and a normal fence still hides samples.
    assert [
        e.version
        for e in parse_sections(notes_module, "## 2.0\n\n```md\n## 9.9.9\n```\n\n## 1.0\n\n- old\n")
    ] == ["2.0", "1.0"]
    for source in (PREVIEW, LINKS):
        assert "info string" in source.read_text(encoding = "utf-8")


def test_preview_follows_commonmark_paragraph_rules():
    """Only an ordered list starting at 1 may interrupt a paragraph, an
    unresolved reference keeps its brackets, and a quote owns its own."""
    src = " ".join(PREVIEW.read_text(encoding = "utf-8").split())
    assert "const interrupts = collector.current === null" in src
    assert "!collector.quotedParagraph;" in src
    assert "definedLabel" in src, "a reference only renders as text when defined"
    # A comment written mid-sentence hides its own line at most.
    assert "COMMENT_BLOCK_OPEN" in src


def test_link_resolver_leaves_raw_blocks_and_escapes_alone():
    src = LINKS.read_text(encoding = "utf-8")
    assert "RAW_HTML_OPEN" in src and "inRawHtml" in src
    assert "isEscaped(line, opener)" in src
    # A heading ends a paragraph, so a definition under one is a definition.
    assert "BLOCK_LINE.test(structure)" in src


def test_code_span_closers_ignore_backslashes():
    """Escapes are not processed inside a code span, so a run after one closes."""
    src = CODE_SPANS.read_text(encoding = "utf-8")
    body = src[src.index("export function codeSpans") :]
    assert body.count("escaped(text") == 1, "only an opener can be escaped"


# The card's incompressible height, a fixed part plus a part that follows
# Settings > Appearance rather than one number measured at the default 15px: at
# the 20px maximum the action row wraps at every card width. The two cards have
# their own constants because the desktop one carries an extra status line;
# scaling one whole box for both asked 256px where 209 was needed, and a floor
# nothing can meet makes the stack cover the composer for no gain.
_SCALED_FLOOR_WEB = "min-h-[calc(109px+80px*var(--ui-font-scale,1))]"
# Below 384px the action pair wraps onto its own row and the card needs a
# whole extra one: 259px at the 20px setting where the wide card needs 209.
_NARROW_FLOOR_WEB = "max-[383px]:min-h-[calc(139px+96px*var(--ui-font-scale,1))]"
_SCALED_FLOOR_TAURI = "min-h-[calc(117px+93px*var(--ui-font-scale,1))]"
_NARROW_FLOOR_TAURI = "max-[383px]:min-h-[calc(24px+224px*var(--ui-font-scale,1))]"


def _capped_stacks(provider: str) -> int:
    """How many overlay stacks cap themselves to the measured geometry.

    Matched on the value being derived from `stack.maxHeight`, not on the literal
    `maxHeight: stack.maxHeight`, because the cap is allowed to be wrapped: the
    shadow-gutter work passes it through `railMaxHeight(...)` so the rail keeps
    room under its bottom card. That is the same cap, plus a constant.

    Pinning the bare expression made a wrapper read as a missing cap, which is the
    mistake this file already made once with the z-index and fixed the same way --
    see "counted by the layer they sit on, not by a literal z-index" below. What
    the tests are about is that EVERY stack is capped; how the number is spelled is
    that code's business. A cap that stops reading stack.maxHeight still fails.
    """
    return len(re.findall(r"maxHeight:\s*(?:[A-Za-z_$][\w$]*\(\s*)?stack\.maxHeight", provider))


def _overlay_stacks(provider: str) -> int:
    """How many bottom-right overlay stacks the provider renders."""
    return len(re.findall(r"z-\[9998\][^\"]*flex flex-col items-end gap-2", provider))


def test_the_overlay_stack_fits_the_viewport():
    """The card's own cap does not account for a download list stacked beneath
    it. The cap is `stackGeometry` now, checked numerically in
    studio/frontend/tests/monitor-stack-inset.test.ts; here the stack must read it."""
    provider = (FRONTEND / "app/provider.tsx").read_text(encoding = "utf-8")
    # Counted by the layer they sit on, not by a literal z-index: the
    # overlay rail reads its depth from Z_LAYER now.
    stacks = provider.count("zIndex: Z_LAYER.OVERLAY_STACK")
    assert stacks, "the bottom-right overlay stack is gone"
    # Counted, not merely present: capping only one of the stacks is the bug here.
    assert _capped_stacks(provider) == stacks, "every stack is capped"
    panel = (FRONTEND / "features/hub/download-manager/download-manager-panel.tsx").read_text(
        encoding = "utf-8"
    )
    # The download list scrolls internally, so it can give up height.
    assert "flex min-h-0" in panel
    # The update card cannot: its header and buttons are fixed and only its
    # notes yield, so it floors instead and the stack scrolls past it.
    web = WEB_BANNER.read_text(encoding = "utf-8")
    assert _SCALED_FLOOR_WEB in web, "the floor is fixed, so it is wrong at other type sizes"
    assert _NARROW_FLOOR_WEB in web, "the floor misses the narrow card's extra button row"
    assert provider.count("overflow-y-auto") >= stacks, "a capped stack clips its cards"


def test_the_desktop_stack_is_capped_like_the_browser_one():
    """The download panel shares the desktop stack, left uncapped before now."""
    provider = (FRONTEND / "app/provider.tsx").read_text(encoding = "utf-8")
    assert provider.count("useStackGeometry()") == 2, "both stacks measure themselves"
    assert _capped_stacks(provider) == 2, "both stacks are capped"
    tauri = TAURI_BANNER.read_text(encoding = "utf-8")
    assert _SCALED_FLOOR_TAURI in tauri, "the floor is fixed, so it is wrong at other type sizes"
    assert _NARROW_FLOOR_TAURI in tauri, "the floor misses the narrow card's extra button row"


def test_the_stack_geometry_is_checked_numerically():
    """The cap is arithmetic now, so the node test owns it. Named here so
    deleting that test does not quietly leave the cap unchecked."""
    geometry = REPO / "studio/frontend/tests/monitor-stack-inset.test.ts"
    src = geometry.read_text(encoding = "utf-8")
    assert (
        "stackGeometry(null, W, H).maxHeight, H - 32" in src
    ), "nothing pins the no-obstacle cap to the 2rem the class used to spell"


def test_desktop_notes_are_not_keyed_by_the_pinned_backend_version():
    """The banner asks with the Studio version it offers. `pypi_version` stays
    in latest.json as the backend pin preflight checks, not a notes key."""
    banner = TAURI_BANNER.read_text(encoding = "utf-8")
    assert "info?.version?.replace(LEADING_V" in banner
    assert "pypiVersion" not in banner, "notes are no longer keyed by the backend release"
    workflow = (REPO / ".github/workflows/release-desktop.yml").read_text(encoding = "utf-8")
    assert "'pypi_version': os.environ['PYPI_VERSION']" in workflow
    rust = (REPO / "studio/src-tauri/src/desktop_update_policy.rs").read_text(encoding = "utf-8")
    assert "pypi_version: Option<String>" in rust
    hook = NOTES_HOOK.parent.joinpath("use-tauri-update.ts").read_text(encoding = "utf-8")
    assert "rawPypiVersion(update.rawJson)" in hook


def test_one_slow_read_cannot_outlast_the_fetch_budget(notes_module):
    """The socket timeout is per operation, so two slow reads doubled the wait."""
    source = MODULE.read_text(encoding = "utf-8")
    assert "_limit_read(response, remaining)" in source
    assert "sock.settimeout(max(remaining, _RELEASES_MIN_READ_SECONDS))" in source


def test_a_heading_indented_into_a_list_item_is_not_a_release(notes_module):
    """CommonMark keeps a heading at the item's content column inside the item.
    Checked against markdown-it (commonmark preset)."""
    text = "## 1.0\n\n- Example:\n  ## 9.9.9\n\n- after\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]
    body = find_section(notes_module, text, "1.0").body
    assert "9.9.9" in body and "after" in body
    # One space short of the content column, the list ends and it is a release.
    left = "## 1.0\n\n- Example:\n ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, left)] == ["1.0", "2.0"]


def test_a_closed_list_stops_holding_headings(notes_module):
    """Only an open item nests a heading, so a dedented block hands it back."""

    def versions(text):
        return [e.version for e in parse_sections(notes_module, text)]

    assert versions("## 1.0\n\n- Example:\n\nText.\n\n  ## 2.0\n") == ["1.0", "2.0"]
    assert versions("## 1.0\n\n- Example:\n## 2.0\n  ## 3.0\n") == ["1.0", "2.0", "3.0"]
    assert versions("## 1.0\n\n- Example:\n  Text.\n---\n  ## 2.0\n") == ["1.0", "2.0"]
    assert versions("## 1.0\n\n- Example:\n```\n```\n  ## 2.0\n") == ["1.0", "2.0"]
    # An item may begin with one blank line; content after that is outside it.
    assert versions("## 1.0\n\n-\n\n  ## 2.0\n") == ["1.0", "2.0"]


def test_a_version_line_is_not_an_ordered_list_marker(notes_module):
    """`2.` needs whitespace after it, or every setext version reads as an item."""
    text = "2.0\n---\n\n- new\n\n1.0\n---\n\n- old\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    # An ordered item interrupts a paragraph only when it starts at 1.
    assert [
        e.version for e in parse_sections(notes_module, "## 1.0\n\nText.\n9) one\n   ## 2.0\n")
    ] == ["1.0", "2.0"]


def test_a_wrapped_setext_heading_is_still_a_release(notes_module):
    """CommonMark promotes the whole paragraph, so a wrapped heading keeps its
    version in the first token. Reading only the last line lost the release."""
    text = "2026.7.5 - Release\nJuly 25\n---\n\n- note\n"
    entries = parse_sections(notes_module, text)
    assert [e.version for e in entries] == ["2026.7.5"]
    # The heading lines are the heading, not the body.
    assert entries[0].body == "- note"
    assert "July 25" not in entries[0].body


def test_a_lowercase_declaration_is_not_a_raw_block(notes_module):
    """Only `<!` plus an uppercase letter opens one, so `<!note` is prose."""
    assert [e.version for e in parse_sections(notes_module, "<!note\n\n## 1.0\n\n- real\n")] == [
        "1.0"
    ]
    # A real declaration still hides its own block.
    assert [
        e.version for e in parse_sections(notes_module, "<!DOCTYPE\n## 9.9.9\n>\n\n## 1.0\n")
    ] == ["1.0"]
    # The collapsed preview needs the same rule or it drops visible bullets.
    assert "<![A-Z]" in PREVIEW.read_text(encoding = "utf-8")


def test_link_resolver_reads_html_containers_the_way_the_others_do():
    """A `<details>` or `<div>` with no blank line inside is a type 6 block, so
    its contents are literal and a fence in it is not a fence, which stopped
    every link below from resolving. The parser and the preview already apply
    the type 6 and 7 rules, so the resolver has to share them."""
    links = LINKS.read_text(encoding = "utf-8")
    for source in (PREVIEW, LINKS):
        text = source.read_text(encoding = "utf-8")
        assert "HTML_BLOCK_TAGS" in text and "HTML_TAG_ONLY_LINE" in text
    # A blank line ends the block, not the closing tag, and a bare quote marker counts as blank.
    assert "inHtmlBlock = !!container.trim()" in links
    # Type 7 cannot interrupt a paragraph, so prose above it keeps its links.
    assert "return !afterParagraph && HTML_TAG_ONLY_LINE.test(line);" in links


def test_an_escaped_mark_makes_an_image_a_link():
    """`\\![alt](path)` renders as a link, so it resolves to the blob host."""
    links = LINKS.read_text(encoding = "utf-8")
    assert 'const image = bang === "!" && !isEscaped(line, offset);' in links
    # The reference pre-scan has to skip it too, or the definition flips host.
    assert "isEscaped(line, match.index)" in links


def test_only_markdown_line_endings_split_the_changelog(notes_module):
    """str.splitlines also breaks on U+2028, U+2029, NEL, vertical tab and form
    feed, none of which end a CommonMark line: one in prose indexed a release
    the renderer never shows and truncated the notes above it."""
    text = "## 2.0\n\nnote with a separator 
## 9.9.9\n\n## 1.0\n\n- old\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0", "1.0"]
    # The prose stays whole rather than being cut at the separator.
    entry = find_section(notes_module, text, "2.0")
    assert entry is not None and "9.9.9" in entry.body
    for separator in ("
", "\x85", "\x0b", "\x0c"):
        broken = f"## 2.0\n\nnote{separator}## 9.9.9\n\n## 1.0\n\n- old\n"
        assert [e.version for e in parse_sections(notes_module, broken)] == ["2.0", "1.0"]
    # The three real line endings still split.
    for ending in ("\n", "\r\n", "\r"):
        real = f"## 2.0{ending}{ending}- new{ending}{ending}## 1.0{ending}{ending}- old{ending}"
        assert [e.version for e in parse_sections(notes_module, real)] == ["2.0", "1.0"]


def test_link_resolver_reads_comments_before_fences():
    """A fence delimiter inside an HTML comment is not a fence: reading it as one
    left the fence open, so every link below went unresolved. The order matters
    both ways, so a comment opener inside a real fence is not a comment."""
    links = LINKS.read_text(encoding="utf-8")
    # Fence state is read before comments are masked, the order the collapsed preview uses.
    assert "const fenceSource = inComment\n      ? null\n      : FENCE.exec(" in links
    # Masking happens only after the in-fence early return.
    fence_return = links.index("// Fenced content is literal")
    assert links.index("const [line, stillInComment, stillRunOn] = maskComments(") > fence_return
    # Commented ranges join the code spans, so a hidden link is left alone.
    assert "const spans = [...codeSpans(masked), ...comments].sort(" in links


def test_preview_heading_and_quote_markers_follow_the_backend_rule():
    """An ATX heading needs an ASCII space, tab or line end after the marker;
    `\\s` also matches a non-breaking space, so prose was read as a heading and
    dropped. A blockquote marker takes at most three leading spaces, or an
    indented sample holding "> - sample output" sheds its indent into the
    summary."""
    src = PREVIEW.read_text(encoding="utf-8")
    assert "const HEADING = /^#{1,6}(?:[ \\t]|$)/;" in src
    assert "const HEADING_LINE = /^ {0,3}#{1,6}(?:[ \\t]|$)/;" in src
    assert "const BLOCKQUOTE = /^ {0,3}>[ \\t]?/;" in src
    # The backend rule this mirrors.
    backend = MODULE.read_text(encoding="utf-8")
    assert "^ {0,3}(?P<hashes>#{1,6})(?:[ \\t]+(?P<title>.*?))?[ \\t]*$" in backend


def test_preview_collects_labels_only_from_real_definitions():
    """A definition-shaped line inside indented code or a deep fence is literal,
    so recording its label made toPlainText strip brackets the expanded view
    keeps. The pre-scan skips the same code the collector pass skips; a real
    definition takes at most three spaces, so the indent test cannot reject one."""
    src = PREVIEW.read_text(encoding="utf-8")
    scan = src.index("const labels = new Set<string>();")
    collect = src.index("let deepFence: string | null = null;")
    prescan = " ".join(src[scan:collect].split())
    assert "let labelFence: string | null = null;" in prescan
    assert "if (line.indent - line.column >= INDENTED_CODE_INDENT) { continue; }" in prescan
    assert "endsDeepFence(labelFence, labelColumn, line)" in prescan


def test_an_html_block_to_the_left_of_a_list_item_closes_it(notes_module):
    """Types 1 to 6 interrupt a paragraph, so an unindented <div> after "- item"
    closes the item and a shallowly indented "## 2.0" below it is a real heading.
    Read as a lazy continuation, the item stayed open and swallowed it."""
    text = "## 3.0\n\n- item\n<div>\nhidden\n</div>\n\n  ## 2.0\n\n- two\n\n## 1.0\n\n- one\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["3.0", "2.0", "1.0"]
    # Without the block the heading really is nested, so it stays suppressed.
    nested = "## 3.0\n\n- item\n\n  ## 2.0\n\n- two\n\n## 1.0\n\n- one\n"
    assert [e.version for e in parse_sections(notes_module, nested)] == ["3.0", "1.0"]
    # Ordinary lazy continuation is untouched.
    lazy = "## 3.0\n\n- item\ncontinued\n\n  ## 2.0\n\n## 1.0\n\n- one\n"
    assert [e.version for e in parse_sections(notes_module, lazy)] == ["3.0", "1.0"]


def test_the_download_panel_can_shrink_inside_the_capped_stack():
    """The stack is capped to the viewport and a flex item defaults to
    min-height:auto, so this wrapper could not shrink and the cap was absorbed by
    the fixed update card rather than the scrolling download list. Only the
    shared-stack branch needs it; standalone is fixed and not a flex item."""
    panel = (FRONTEND / "features/hub/download-manager/download-manager-panel.tsx").read_text(
        encoding="utf-8"
    )
    assert 'positioned ? "fixed bottom-4 right-4 z-50" : "flex min-h-0 justify-end"' in panel
    provider = (FRONTEND / "app/provider.tsx").read_text(encoding="utf-8")
    # Counted by the layer they sit on, not by a literal z-index: the
    # overlay rail reads its depth from Z_LAYER now.
    stacks = provider.count("zIndex: Z_LAYER.OVERLAY_STACK")
    assert _capped_stacks(provider) == stacks, "the cap this has to absorb"


@pytest.fixture(scope="module")
def run_scanner(tmp_path_factory):
    """Run the frontend's markdown scanners under node.

    Their job is to classify a line the way a CommonMark renderer would, which
    only a real run can show. The "@/lib" alias resolves through Vite, not node,
    so the copies have it rewritten."""
    node = shutil.which("node")
    if node is None:
        pytest.skip("node is needed to run the TypeScript scanners")
    work = tmp_path_factory.mktemp("release-notes-scanners")
    for source in (PREVIEW, CODE_SPANS, LINKS, LIST_COLUMNS, INLINE_COMMENTS):
        rewritten = _TS_ALIAS.sub(r'"./\1.ts"', source.read_text(encoding="utf-8"))
        (work / source.name).write_text(rewritten, encoding="utf-8")
    (work / "run.ts").write_text(_TS_RUNNER, encoding="utf-8")

    def run(kind: str, markdown: str):
        result = subprocess.run(
            [node, "--experimental-strip-types", "--no-warnings", str(work / "run.ts"), kind],
            input=markdown,
            capture_output=True,
            text=True,
        )
        if result.returncode != 0:
            pytest.skip(f"node could not run the scanners: {result.stderr.strip()[:200]}")
        return json.loads(result.stdout)

    return run


def preview_leads(preview) -> list[str]:
    return [item["lead"] for item in preview["items"]]


def test_a_link_indented_under_a_bullet_still_resolves(run_scanner):
    """CommonMark measures indentation from the container (spec 0.31.2 section
    5.2), so under "- Details:" a four-space line is two columns in: a paragraph
    holding a link. Measuring from the margin called it code (section 4.4) and
    left the destination relative to Studio's own origin."""
    resolved = run_scanner("links", "- Details:\n\n    [guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in resolved
    # The same prose one column further in really is code, and stays untouched.
    code = run_scanner("links", "- Added.\n\n      [guide](docs/a.md)\n")
    assert "[guide](docs/a.md)" in code and "github.com" not in code
    # At document level four spaces is code, so that link is still left alone.
    top = run_scanner("links", "Intro.\n\n    [guide](docs/a.md)\n")
    assert "[guide](docs/a.md)" in top and "github.com" not in top


def test_an_indented_fence_does_not_swallow_the_bullets_below_it(run_scanner):
    """A four-space line at document level is indented code, and a top-level
    bullet does not continue it. Promoting it to a list-contained fence left a
    block open with no closer, so every bullet after it was skipped."""
    swallowed = "Example:\n\n    ```\n\n- Added the exporter\n- Fixed the crash\n"
    assert preview_leads(run_scanner("preview", swallowed)) == [
        "Added the exporter",
        "Fixed the crash",
    ]
    # With nothing else to fall back on the summary disappeared entirely.
    assert preview_leads(run_scanner("preview", "    ```\n\n- Added the exporter\n")) == [
        "Added the exporter"
    ]
    # A fence that really is inside an item still hides that item's code.
    nested = "- a\n  - b\n    ```\n    - not a bullet\n    ```\n\n- Added tests\n"
    assert preview_leads(run_scanner("preview", nested)) == ["a", "Added tests"]


def test_a_table_only_release_previews_as_nothing(run_scanner):
    """A GFM table renders as a grid, so it previews as nothing and the panel
    stays collapsed. Falling through to the prose collector put the raw
    "| Change | Detail | | --- | --- |" delimiters in the popup instead."""
    table = "| Change | Detail |\n| --- | --- |\n| Exporter | Added GGUF |\n"
    assert run_scanner("preview", table)["items"] == []
    # A table after prose is dropped too, rather than joined onto it.
    assert preview_leads(run_scanner("preview", f"Some prose.\n\n{table}")) == ["Some prose."]
    # A bullet right after the rows ends the table, so it still previews.
    assert preview_leads(run_scanner("preview", f"{table}- Added tests\n")) == ["Added tests"]
    # Mismatched header and delimiter widths are no table, as on GitHub, so both lines are prose.
    assert preview_leads(run_scanner("preview", "| a | b |\n| --- |\n")) == ["| a | b | | --- |"]


def test_a_fence_inside_a_list_item_ends_with_the_item(notes_module):
    """A fence is scoped to its container (spec 0.31.2 section 4.5), so with no
    closer it ends with the item and a dedented "## 2.0" is a real heading.
    Document-wide state kept the block open and hid every release below it."""
    text = "## 1.0\n\n- item\n  ```\n\n## 2.0\n\n- two\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0", "2.0"]
    # A fence at document level still runs to the end of the file.
    top = "## 1.0\n\n```\n\n## 2.0\n\n- two\n"
    assert [e.version for e in parse_sections(notes_module, top)] == ["1.0"]
    # A closed fence inside an item is unaffected, and its sample stays hidden.
    closed = "## 1.0\n\n- Run:\n  ```bash\n  ## 9.9.9\n  ```\n\n## 2.0\n\n- two\n"
    assert [e.version for e in parse_sections(notes_module, closed)] == ["1.0", "2.0"]
    # Content dedented out of the item ends the item and the fence with it.
    assert find_section(notes_module, text, "2.0").body == "- two"


def test_stripping_comments_stays_linear_in_the_code_spans(notes_module):
    """The comment scanner restarted its code-span search per opener, so N spans
    cost N squared. A 203 KiB line is well inside the 2 MiB accepted, and notes
    are reparsed on every request, so one held a worker for over ten seconds."""
    line = "`a` <!--x--> " * 16_000
    assert len(line) < notes_module.RELEASES_MAX_BYTES
    started = time.monotonic()
    visible, in_comment = notes_module._strip_comments(line, False, False)
    elapsed = time.monotonic() - started
    # Roughly 40ms scanning forward against roughly 11s restarting each time.
    assert elapsed < 2.0, f"comment stripping took {elapsed:.1f}s"
    # Same result as before: the spans survive and the comments are gone.
    assert in_comment is False
    assert "<!--" not in visible and visible.count("`a`") == 16_000


def test_the_three_scanners_share_one_list_column_rule():
    """The parser and both frontend scanners must classify a line the same way;
    drifting on indentation is what put a paragraph link inside a code block.
    The frontend pair shares one module, ported from the backend's tracker."""
    shared = LIST_COLUMNS.read_text(encoding="utf-8")
    assert "export function openLists(" in shared
    assert "_open_lists" in shared, "the backend function this mirrors"
    for source in (PREVIEW, LINKS):
        src = source.read_text(encoding="utf-8")
        assert 'from "@/lib/markdown-list-columns"' in src
        assert "openLists(" in src
    # Both sides measure indented code from the container, not from the margin.
    backend = MODULE.read_text(encoding="utf-8")
    assert "_indent_width(visible) - column >= 4" in backend
    assert "indentWidth(structure) - column >= INDENTED_CODE_INDENT" in LINKS.read_text(
        encoding="utf-8"
    )


def test_a_failed_fetch_keeps_retry_reachable():
    """A release with no notes is ready and a failed fetch is error; only the
    error is retryable, and rendering there would replace the Retry button."""
    src = " ".join(PANEL.read_text(encoding="utf-8").split())
    assert "const source = notes?.matched ? notes.markdown : null;" in src
    # Only NotesStatus renders retry, in the else of the markdown branch: an error has no markdown.
    assert "{markdown ? (" in src
    assert "retry={retry}" in src

    hook = " ".join(
        (FRONTEND / "hooks" / "use-release-notes.ts").read_text(encoding="utf-8").split()
    )
    assert (
        "const failed = !next || (!next.matched && next.error !== null);" in hook
    ), "the distinction this relies on"


def test_an_unclosed_comment_in_prose_cannot_hide_later_links(run_scanner):
    """CommonMark opens an HTML block (spec 0.31.2 section 4.6, type 2) only when
    the line begins with `<!--`; one mid-sentence is inline and cannot outlive
    its block. Carrying the unclosed state on masked every link below it."""
    repo = "https://github.com/unslothai/unsloth/blob/main/docs/a.md"
    # A separate list item is a separate block, so the link below still renders.
    item = run_scanner("links", "- Type <!-- to begin a comment\n- See [docs](docs/a.md)\n")
    assert repo in item
    # So does a paragraph the blank line already ended.
    paragraph = run_scanner("links", "Type <!-- to begin\n\nSee [docs](docs/a.md)\n")
    assert repo in paragraph
    # A delimiter inside inline code is literal, as it is for the parser.
    spanned = run_scanner("links", "- Wrap in `<!--` and `-->`\n- See [docs](docs/a.md)\n")
    assert repo in spanned
    # A comment starting a line is a block: it hides down to the closer's line, that line included.
    block = run_scanner("links", "<!-- staged\n- See [docs](docs/a.md)\n-->\n")
    assert repo not in block
    closer = run_scanner("links", "<!-- staged\n--> See [docs](docs/a.md)\n")
    assert repo not in closer


def test_a_bare_level_two_marker_ends_the_release(notes_module, run_scanner):
    """An ATX heading's opening sequence may be followed by the end of the line
    (spec 0.31.2 section 4.2), so a bare `##` is an empty level-two heading.
    Requiring whitespace kept everything below it inside the release above."""
    text = "## 2.0\n\n- new thing\n\n##\n\n- SECRET: not part of 2.0\n"
    entry = find_section(notes_module, text, "2.0")
    assert "new thing" in entry.body
    assert "SECRET" not in entry.body
    # An empty heading has no version, so it ends a release without indexing one.
    assert [e.version for e in parse_sections(notes_module, text)] == ["2.0"]
    # Prose still needs a space or a tab: `##x` is a paragraph, not a heading.
    prose = "## 2.0\n\n- new thing\n\n##x\n\n- still 2.0\n"
    assert "still 2.0" in find_section(notes_module, prose, "2.0").body
    # The preview agrees: an empty heading renders as nothing, so it ends the bullet.
    preview = run_scanner("preview", "- new thing\n##\nUnrelated scratch notes\n")
    assert preview_leads(preview) == ["new thing"]


def test_a_comment_between_bullets_closes_the_list(notes_module, run_scanner):
    """A comment is an HTML block (spec 0.31.2 section 4.6, type 2), so one at
    the margin under a bullet closes the list. Blanking the line before list
    tracking saw it reads as a blank line, which leaves the item open and made
    the release heading below look like nested content."""
    text = "## 1.0\n\n- old item\n<!-- separator -->\n  ## 2.0\n\n- new item\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0", "2.0"]
    assert "new item" not in find_section(notes_module, text, "1.0").body
    assert "new item" in find_section(notes_module, text, "2.0").body
    # At the item's content column the comment stays inside it, so the heading under it is nested.
    nested = "## 1.0\n\n- old item\n  <!-- separator -->\n  ## 2.0\n\n- new item\n"
    assert [e.version for e in parse_sections(notes_module, nested)] == ["1.0"]
    # The link resolver reads the same column: list closed, four spaces is code, left untouched.
    code = run_scanner("links", "- old item\n<!-- separator -->\n    [guide](docs/a.md)\n")
    assert "[guide](docs/a.md)" in code and "github.com" not in code
    # Inside the item those four spaces are two columns in, so it is prose and the link resolves.
    prose = run_scanner("links", "- old item\n  <!-- separator -->\n    [guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in prose
    # The preview agrees: the fence is indented code, not a fence swallowing the bullet below.
    preview = run_scanner(
        "preview",
        "- Details:\n<!-- separator -->\n    ```\n    - hidden sample\n- Real second item\n",
    )
    assert preview_leads(preview) == ["Details:", "Real second item"]


def test_a_parenthesised_link_destination_still_resolves(run_scanner):
    """A destination may hold parentheses while they balance (spec 0.31.2 section
    6.3), so `[x]((draft).md)` points at `(draft).md`. Stopping at the first
    paren matched an empty destination and left the link relative."""
    leading = run_scanner("links", "[details]((draft).md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/(draft).md" in leading
    # An image resolves against the raw host the same way.
    image = run_scanner("links", "![shield]((badge).png)\n")
    assert "https://raw.githubusercontent.com/unslothai/unsloth/main/(badge).png" in image
    # A pair in the middle of a path balances too.
    middle = run_scanner("links", "[api](docs/(v2)/api.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/(v2)/api.md" in middle
    # An unbalanced paren makes the destination invalid, so `[x](a(b.md)` is plain text, not a link.
    unbalanced = run_scanner("links", "[x](a(b.md)\n")
    assert unbalanced == "[x](a(b.md)\n"
    # One more closer balances the pair, and then it is a link again.
    closed = run_scanner("links", "[x](a(b.md))\n")
    assert "https://github.com/unslothai/unsloth/blob/main/a(b.md)" in closed
    # Pairs nest, and one level was all the expression allowed, so a path with two stayed relative.
    nested = run_scanner("links", "[x](((draft)).md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/((draft)).md" in nested
    deep = run_scanner("links", "![shot](((((v2))))).png)\n")
    assert "https://raw.githubusercontent.com/unslothai/unsloth/main/((((v2))))" in deep
    # The closer must still be there: an unbalanced run below a nested pair is not a link.
    across = run_scanner("links", "[x](((a).md\n[y](docs/y.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/y.md" in across
    assert "[x](((a).md" in across


def test_a_fence_inside_a_container_still_hides_its_sample(run_scanner):
    """A fence is measured from its container (spec 0.31.2 section 4.5), so
    `> ~~~` and one under a nested bullet both open a fence. Reading the margin
    never saw them, so a link in a code block was rewritten into verbatim text."""
    quoted = run_scanner("links", "> ~~~\n> [guide](docs/a.md)\n> ~~~\n")
    assert "[guide](docs/a.md)" in quoted and "github.com" not in quoted
    nested = run_scanner("links", "- a\n  - b\n    ~~~\n    [x](docs/x.md)\n    ~~~\n")
    assert "[x](docs/x.md)" in nested and "github.com" not in nested
    # A longer closer is still a closer, so the pair is not something a code span hid.
    uneven = run_scanner("links", "> ```\n> [guide](docs/a.md)\n> ````\n")
    assert "[guide](docs/a.md)" in uneven and "github.com" not in uneven
    # The fence ends with its container: a line outside the quote, or left of the item, is Markdown.
    left = run_scanner("links", "> ~~~\n[guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in left
    dedented = run_scanner("links", "- a\n  ~~~\n[guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in dedented
    # A document-level fence owns the quoted lines below, so the marker does not undo it.
    document = run_scanner("links", "~~~\n> [guide](docs/a.md)\n~~~\n")
    assert "[guide](docs/a.md)" in document and "github.com" not in document
    # Four columns past the item's content column it is indented code, not a fence: still literal.
    code = run_scanner("links", "- Details:\n\n      ~~~\n      [guide](docs/a.md)\n")
    assert "[guide](docs/a.md)" in code and "github.com" not in code


def test_an_html_block_inside_a_container_is_literal_too(run_scanner):
    """Type 1 and type 6 blocks are measured from their container too, so a
    `<details>` under a nested bullet and a `<pre>` in a quote are verbatim.
    Missing the opener rewrote the literal examples inside them."""
    nested = run_scanner("links", "- a\n  - b\n    <details>\n    [x](docs/x.md)\n    </details>\n")
    assert "[x](docs/x.md)" in nested and "github.com" not in nested
    quoted = run_scanner("links", "> <pre>\n> [x](docs/x.md)\n> </pre>\n")
    assert "[x](docs/x.md)" in quoted and "github.com" not in quoted
    # The block ends with its container, so a line dedented out of the item is Markdown again.
    dedented = run_scanner("links", "- a\n  - b\n    <details>\n[x](docs/x.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/x.md" in dedented
    # Inside a quote a bare marker holds nothing, the blank line that ends a type 6 block.
    blank = run_scanner("links", "> <details>\n>\n> [x](docs/x.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/x.md" in blank


def test_an_underline_left_of_an_item_is_lazy_text_of_it(notes_module, run_scanner):
    """A setext underline may never be a lazy continuation (spec 0.31.2 section
    4.3), so `===` left of an open item is more of the item's paragraph.
    Rejecting it ended the list and promoted the nested "## 2.0" to a release."""
    nested = "## 1.0\n- old note\n===\n  ## 2.0\n- new\n"
    assert [e.version for e in parse_sections(notes_module, nested)] == ["1.0"]
    # A row of dashes is a thematic break, closing the item, so the heading is the next release.
    broken = "## 1.0\n- old note\n---\n  ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, broken)] == ["1.0", "2.0"]
    # With no paragraph above it the underline opens one, so the blank line closes the item.
    apart = "## 1.0\n- old note\n\n===\n  ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, apart)] == ["1.0", "2.0"]
    # The link scanner keeps the item open, so the four-space line is a paragraph and resolves.
    resolved = run_scanner("links", "- Details:\n===\n\n    [guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in resolved


def test_a_quote_keeps_its_paragraph_to_itself(notes_module, run_scanner):
    """A marker written outside a blockquote is not text of the quote's
    paragraph, so `2. item` under `> quote` opens a list even though an ordered
    marker past 1 may not interrupt one (spec 0.31.2 section 5.2). Lending the
    paragraph to the document left the list closed and the heading exposed."""
    quoted = "## 1.0\n> quote\n2. item\n   ## 2.0\n- new\n"
    assert [e.version for e in parse_sections(notes_module, quoted)] == ["1.0"]
    # A quote holding a heading leaves no paragraph, nor does an empty one, so the list opens.
    heading = "## 1.0\n> # inner\n2. item\n   ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, heading)] == ["1.0"]
    # An unquoted line the quote's paragraph swallows keeps it open, the marker still outside.
    lazy = "## 1.0\n> quote\ntext\n2. item\n   ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, lazy)] == ["1.0"]
    # Under an ordinary paragraph the marker is its text, so no list opens and the heading is real.
    prose = "## 1.0\nprose\n2. item\n   ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, prose)] == ["1.0", "2.0"]
    # The preview reads the marker as a bullet for the same reason.
    assert preview_leads(run_scanner("preview", "> quote\n2. item\n")) == ["item"]


def test_indented_code_before_an_ordered_marker_still_opens_a_list(notes_module):
    """An indented code block ends at the first line not indented enough, and no
    paragraph is open, so `2. item` opens a list whatever its start number.
    Reading it as code text left the list closed and the nested heading exposed."""
    joined = "## 1.0\n\n    code\n2. item\n   ## 2.0\n- new\n"
    assert [e.version for e in parse_sections(notes_module, joined)] == ["1.0"]
    # A blank line between the two changes nothing: the list opens either way.
    apart = "## 1.0\n\n    code\n\n2. item\n   ## 2.0\n- new\n"
    assert [e.version for e in parse_sections(notes_module, apart)] == ["1.0"]
    # Four columns past its container the marker is code, so no list opens and the heading stands.
    inside = "## 1.0\n\n    code\n    - item\n  ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, inside)] == ["1.0", "2.0"]


def test_a_fence_written_as_an_item_first_content_opens_in_that_item(run_scanner):
    """A block straight after a marker is the item's own first content, measured
    from where that content starts (spec 0.31.2 section 5.2), so "- ```md" opens
    a fence. Reading the whole line never saw one, so the sample below was
    treated as prose and rewritten, and its info string became a headline."""
    sample = run_scanner("links", "- ```md\n  [example](docs/a.md)\n  ```\n")
    assert "[example](docs/a.md)" in sample and "github.com" not in sample
    ordered = run_scanner("links", "1. ~~~\n   [example](docs/a.md)\n   ~~~\n")
    assert "[example](docs/a.md)" in ordered and "github.com" not in ordered
    # The preview agrees: an item of only a code block previews as nothing; the next is a bullet.
    preview = run_scanner("preview", "- ```md\n  sample text\n  ```\n- Added tests\n")
    assert preview_leads(preview) == ["Added tests"]
    # One column further in it is indented code inside the item, so the link is prose and resolves.
    padded = run_scanner("links", "-     ```\n  [example](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in padded
    # A marker the paragraph above swallows opens no item, so no fence: ordered items open at 1.
    lazy = run_scanner("links", "Intro.\n2. ```\n[guide](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in lazy


def test_an_html_block_ends_with_the_item_it_was_written_in(notes_module, run_scanner):
    """An HTML block takes no lazy continuation line, so one opened on an item's
    continuation line ends with the item, as a fence there does. Ending it only
    on a blank line let it swallow the next release heading."""
    text = "## 1.0\n\n- item\n\n  <div>\n## 2.0\n\n- new thing\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0", "2.0"]
    assert "new thing" in find_section(notes_module, text, "2.0").body
    # A raw block such as <pre> is scoped the same way.
    raw = "## 1.0\n\n- item\n\n  <pre>\n## 2.0\n\n- new thing\n"
    assert [e.version for e in parse_sections(notes_module, raw)] == ["1.0", "2.0"]
    # At the item's content column the block holds the heading, which is nested and indexes nothing.
    nested = "## 1.0\n\n- item\n\n  <div>\n  ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, nested)] == ["1.0"]
    # The preview reads it the same way: the bullet below the block is a bullet.
    preview = run_scanner("preview", "- item\n\n  <div>\n- Added tests\n")
    assert preview_leads(preview) == ["item", "Added tests"]
    # An opener straight after a marker opens in that item, so the dedented heading is a release.
    marked = "## 1.0\n\n- <div>\n## 2.0\n\n- new thing\n"
    assert [e.version for e in parse_sections(notes_module, marked)] == ["1.0", "2.0"]


def test_a_comment_may_close_on_a_later_line_of_its_paragraph(run_scanner):
    """A comment written mid-sentence belongs to its paragraph, so its `-->` may
    arrive on a later line of it and everything between renders as nothing.
    Ending it at its own line left a backtick inside pairing with a real one
    below, hiding a link, and left the preview quoting hidden text."""
    carried = run_scanner("links", "Note <!-- ` open\nstill --> see [d](docs/a.md) and `x`\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in carried
    # Text inside the comment renders as nothing, so it is left alone.
    inside = run_scanner("links", "Note <!-- see [c](docs/c.md)\nmore --> end\n")
    assert "[c](docs/c.md)" in inside and "github.com" not in inside
    # The preview hides it too, rather than quoting the comment at the reader.
    preview = run_scanner(
        "preview", "- Added X <!-- TODO: rewrite\n  this properly -->\n- Second\n"
    )
    assert preview_leads(preview) == ["Added X", "Second"]
    # An opener cannot outlive its paragraph: with it closed the `<!--` is text and hides nothing.
    broken = run_scanner("links", "Note <!-- open\n\nsecret --> end [d](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in broken
    # A heading breaks into the paragraph, so it ends the comment's reach too.
    headed = run_scanner("links", "Note <!-- open\n## 2.0 --> end [d](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in headed
    assert preview_leads(run_scanner("preview", "Note <!-- open\n\n- Second\n")) == ["Second"]


def test_only_punctuation_is_escapable_in_a_link_destination(run_scanner):
    """CommonMark escapes ASCII punctuation and nothing else (spec 0.31.2 section
    2.4), so the backslash in `docs\\alpha.md` is a character of the path.
    Dropping it rewrote a Windows or namespaced path to the wrong file."""
    kept = run_scanner("links", "[guide](docs\\alpha.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs%5Calpha.md" in kept
    # An escaped backslash is one literal backslash, which survives the same.
    escaped = run_scanner("links", "[guide](docs\\\\alpha.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs%5Calpha.md" in escaped
    # A real escape is still an escape: `\\(` is a paren of the path.
    paren = run_scanner("links", "[guide](a\\(b.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/a(b.md" in paren
    # A space still ends the destination, escaped or not, so there is no link.
    spaced = run_scanner("links", "[guide](a\\ b.md)\n")
    assert spaced == "[guide](a\\ b.md)\n"


def test_one_definition_does_not_hide_the_next(run_scanner):
    """Definitions may run consecutively (spec 0.31.2 section 4.7) and none is
    paragraph text, so none opens a paragraph the next cannot interrupt.
    Counting one as prose left every definition after the first unresolved.
    The backend already reads the line this way."""
    text = (
        "- AMD support is here, see [the AMD guide][amd] and the\n"
        "  [Intel notes][xpu].\n\n"
        "[amd]: docs/basics/amd.md\n"
        "[xpu]: docs/basics/xpu.md\n"
    )
    resolved = run_scanner("links", text)
    base = "https://github.com/unslothai/unsloth/blob/main/docs/basics/"
    assert f"[amd]: {base}amd.md" in resolved
    assert f"[xpu]: {base}xpu.md" in resolved
    # A run of them stays a run however long it is.
    run = run_scanner("links", "[a]: docs/a.md\n[b]: docs/b.md\n[c]: docs/c.md\n")
    assert run.count("https://github.com/unslothai/unsloth/blob/main/docs/") == 3
    # Prose between them opens a paragraph the next line may not interrupt, so it is not one.
    prose = run_scanner("links", "[a]: docs/a.md\nintro\n[b]: docs/b.md\n")
    assert "[b]: docs/b.md" in prose


def test_a_comment_closed_on_its_own_line_still_closes(run_scanner):
    """A multiline comment is usually closed by a `-->` on a line of its own, and
    a wrapped line may open with emphasis. Reading any leading punctuation as a
    new block meant neither continued the paragraph, so the comment never closed
    and the popup showed the author's internal note."""
    closer = run_scanner(
        "preview",
        "- DoRA training is available in Studio. <!-- TODO confirm the exact\n"
        "  flag name before release\n-->\n",
    )
    assert preview_leads(closer) == ["DoRA training is available in Studio."]
    # A continuation may open with emphasis, which is text and not a block.
    starred = run_scanner(
        "preview",
        "- DoRA training is available. <!-- TODO confirm the\n  *before* release -->\n",
    )
    assert preview_leads(starred) == ["DoRA training is available."]
    underscored = run_scanner(
        "preview",
        "- DoRA training is available. <!-- TODO confirm the\n  _draft_ note -->\n",
    )
    assert preview_leads(underscored) == ["DoRA training is available."]
    # A real block still ends the paragraph, so the opener below one is text and hides nothing.
    broken = run_scanner("links", "Note <!-- open\n## 2.0\nsecret --> [d](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in broken
    # So does a list item with content, which may interrupt a paragraph.
    item = run_scanner("links", "Note <!-- open\n- bullet\nsecret --> [d](docs/a.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/a.md" in item


def test_a_comment_written_as_an_item_first_content_is_a_block(notes_module, run_scanner):
    """A comment is an HTML block (spec 0.31.2 section 4.6, type 2), so one
    written as an item's first content opens inside that item, as a fence does.
    Looking for the opener at the margin let a marker in front of it hide the
    block, so the resolver rewrote hidden text and the preview quoted it."""
    item = run_scanner("links", "- <!-- new --> AMD support, see [the guide](docs/amd.md)\n")
    assert item == "- <!-- new --> AMD support, see [the guide](docs/amd.md)\n"
    # Every marker opens an item, and a nested one is still an item.
    for text in (
        "* <!-- new --> see [the guide](docs/amd.md)\n",
        "1. <!-- new --> see [the guide](docs/amd.md)\n",
        "- outer\n  - <!-- new --> see [the guide](docs/amd.md)\n",
    ):
        assert "github.com" not in run_scanner("links", text)
    # The multiline form hides lines to the closer, as a comment at the item's content column did.
    multiline = run_scanner("links", "- <!-- hidden\n  [a](docs/x.md)\n  -->\n")
    assert "[a](docs/x.md)" in multiline and "github.com" not in multiline
    # Still scoped to the item it was written in, so a line dedented out of it ends the block.
    dedented = run_scanner("links", "- <!-- hidden\n[a](docs/x.md)\n")
    assert "https://github.com/unslothai/unsloth/blob/main/docs/x.md" in dedented
    # The preview agrees: an item of only the block previews as nothing; the next is a bullet.
    preview = run_scanner("preview", "- <!-- new --> hidden note\n- Real bullet\n")
    assert preview_leads(preview) == ["Real bullet"]
    # The parser agrees too: the item keeps its column, so a heading inside is nested, not indexed.
    text = "## 1.0\n\n- <!-- hidden\n\n  ## 2.0\n"
    assert [e.version for e in parse_sections(notes_module, text)] == ["1.0"]


# Real bodies, so the classification is checked against how releases are written.
@pytest.mark.parametrize(
    "tag,kept,dropped",
    [
        (
            # The usual shape: announcement, install block, generated footer.
            "v0.1.60-beta",
            ["Meta has released Muse Glimmer", "[Run Muse Glimmer]"],
            [
                "## Updating / installing Unsloth",
                "install.sh",
                "## What's Changed",
                "## New Contributors",
                "Full Changelog",
            ],
        ),
        (
            # The install block sits between two content sections, so truncating
            # at the first generated heading would lose the Keyv notice below.
            "v0.1.526-beta",
            [
                "## August 7th Update",
                "## DeepSeek V4 Flash 0731 + DSpark",
                "## Kimi K3",
                "Keyv security incident",
            ],
            ["## Updating / installing Unsloth", "install.ps1", "## What's Changed"],
        ),
        (
            # Same, with ten content sections after the install block.
            "v0.1.501-beta",
            [
                "## 23rd July Update",
                "## Train LLMs Locally on AMD",
                "### Safer Agents",
            ],
            [
                "## Updating / installing Unsloth",
                "## What's Changed in Unsloth",
                "## What's Changed in Unsloth-Zoo",
                "## 23rd July Update Unsloth changelog",
            ],
        ),
        (
            # The install block is the first heading and its platform headings
            # are siblings, not children, so level alone does not end it.
            "v0.1.43-beta",
            ["## Mac Updates", "## Windows Updates", "## Blackwell GPUs Update"],
            [
                "To update Unsloth or install a new Unsloth Studio",
                "### macOS, Linux, WSL:",
                "### Windows:",
                "irm https://unsloth.ai/install.ps1",
            ],
        ),
        (
            # A body written entirely at level 3 is all announcement, and the
            # install block is introduced by a paragraph rather than a heading.
            "v0.1.471-beta",
            ["### Better context length algorithm", "### Training & General Fixes"],
            [
                "## What's Changed",
                "## New Contributors",
                "To update Unsloth or install a new Unsloth Studio",
                "Ensure your version is",
                "curl -fsSL https://unsloth.ai/install.sh",
                "irm https://unsloth.ai/install.ps1",
            ],
        ),
    ],
)
def test_real_release_bodies_keep_their_announcement(notes_module, tag, kept, dropped):
    body = (BODIES / f"{tag}.md").read_text(encoding="utf-8")
    stripped = notes_module.strip_release_body(body)
    for text in kept:
        assert text in stripped, f"{tag} lost {text!r}"
    for text in dropped:
        assert text not in stripped, f"{tag} kept {text!r}"


def test_the_build_provenance_the_workflow_appends_is_dropped(notes_module):
    """release-desktop.yml appends this block, so it arrives under announcements."""
    body = "The announcement.\n\n### Build provenance\n\n- workflow run 123\n"
    stripped = notes_module.strip_release_body(body)
    assert stripped == "The announcement."


def test_a_generated_heading_inside_a_sample_is_not_one(notes_module):
    """A release documenting the notes format writes `## What's Changed` in a
    fence, and reading it as the footer would cut the announcement there."""
    body = (
        "The announcement.\n\n"
        "```md\n## What's Changed\n```\n\n"
        "## Kimi K3\n\n- still here\n\n"
        "## What's Changed\n\n* a pull request\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert "```md" in stripped and "## Kimi K3" in stripped and "still here" in stripped
    assert "a pull request" not in stripped


def test_a_heading_that_only_reads_like_boilerplate_is_kept(notes_module):
    """A reviewed list, not a substring sweep: these titles only share words."""
    for title in (
        "## What changed in Gemma 4",
        "## Updating models is now 2x faster",
        "## Installing a LoRA from the Hub",
    ):
        body = f"Intro.\n\n{title}\n\n- a real change\n"
        assert "a real change" in notes_module.strip_release_body(body), title


def test_an_install_block_introduced_by_a_paragraph_is_dropped(notes_module):
    """`v0.1.471-beta` writes the install sentence with no hashes. A paragraph
    has no level, so its block runs to the next non-platform heading."""
    body = (
        "The announcement.\n\n"
        "To update Unsloth or install a new Unsloth Studio, you must use the below.\n"
        "Ensure your version is `2026.6.9` for the latest.\n\n"
        "MacOS, Linux, WSL:\n```\ncurl -fsSL https://unsloth.ai/install.sh | sh\n```\n\n"
        "Windows:\n```\nirm https://unsloth.ai/install.ps1 | iex\n```\n\n"
        "### Better context length algorithm\n\n- a real change\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert stripped == (
        "The announcement.\n\n### Better context length algorithm\n\n- a real change"
    )


def test_a_paragraph_install_block_keeps_its_platform_headings(notes_module):
    """Platform headings go with the block whether it opened as heading or prose."""
    body = (
        "Intro.\n\n"
        "To update Unsloth, use the commands below:\n\n"
        "#### macOS, Linux, WSL:\n```\ncurl -fsSL https://unsloth.ai/install.sh | sh\n```\n\n"
        "#### Windows:\n```\nirm https://unsloth.ai/install.ps1 | iex\n```\n\n"
        "## Fixes\n\n1. a real fix\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert stripped == "Intro.\n\n## Fixes\n\n1. a real fix"


def test_a_platform_heading_opens_an_install_block_on_its_own(notes_module):
    """`v0.1.0-beta` and `v0.1.41-beta` head their commands with a bare platform
    heading, so requiring an "Updating" above it left them in the popup. All
    seven platform headings in the 24 published bodies head an install block."""
    body = (
        "Intro.\n\n"
        "#### macOS, Linux, WSL:\n```\ncurl -fsSL https://unsloth.ai/install.sh | sh\n```\n\n"
        "#### Windows:\n```\nirm https://unsloth.ai/install.ps1 | iex\n```\n\n"
        "## Fixes\n\n1. a real fix\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert stripped == "Intro.\n\n## Fixes\n\n1. a real fix"


def test_only_a_paragraph_of_its_own_opens_an_install_block(notes_module):
    """The same words inside the announcement are prose, not instructions:
    `v0.1.39-beta` says "call `curl ...` to update" mid-sentence, and generated
    entries are `* Update ...` lines. Neither opens a document-level paragraph."""
    continuation = (
        "Unsloth Studio 2026.5.2 is out.\n"
        "To update Unsloth, run the installer.\n\n"
        "## Fixes\n\n- a real fix\n"
    )
    stripped = notes_module.strip_release_body(continuation)
    # The second line continues the paragraph rather than opening one.
    assert "Unsloth Studio 2026.5.2 is out." in stripped
    assert "To update Unsloth, run the installer." in stripped
    assert "- a real fix" in stripped

    for line in ("* Update Studio icons by @someone", "> To update Unsloth, run it"):
        body = f"Intro.\n\n{line}\n\n## Fixes\n\n- a real fix\n"
        assert "a real fix" in notes_module.strip_release_body(body), line


def test_a_paragraph_install_block_does_not_swallow_deeper_headings(notes_module):
    """A heading section drops its subheadings, but a paragraph has no level, so
    the next heading resumes the announcement whatever its depth."""
    body = (
        "Intro.\n\n"
        "To update Unsloth, use the command below:\n"
        "```\ncurl -fsSL https://unsloth.ai/install.sh | sh\n```\n\n"
        "###### Deeply nested announcement\n\n- a real change\n"
    )
    stripped = notes_module.strip_release_body(body)
    assert stripped == "Intro.\n\n###### Deeply nested announcement\n\n- a real change"