feat: Mastodon Post Composition and Publishing

tests/test_publishing.py

@@ -0,0 +1,191 @@
+from __future__ import annotations
+
+import os
+from datetime import date
+from pathlib import Path
+from typing import Callable
+
+import pytest
+
+from tenbackward.config import load_config
+from tenbackward.matching import MatchedPost
+from tenbackward.publishing import (
+    MASTODON_STATUS_LIMIT,
+    PublishError,
+    build_status_text,
+    publish_mastodon,
+    slugify_title,
+    validate_status,
+)
+from tenbackward.state import PostedStore
+
+
+def _make_match(path: str, title: str, day: int = 4) -> MatchedPost:
+    return MatchedPost(
+        path=path,
+        title=title,
+        date=date(2016, 8, day),
+        url=f"https://blog.example.com/2016/08/{day:02d}/{path.split('-', 3)[-1].removesuffix('.md')}/",
+    )
+
+
+class _FakeMastodon:
+    """Captures ``status_post`` calls and can be configured to raise."""
+
+    def __init__(self, *, raise_on_post: Exception | None = None) -> None:
+        self.raise_on_post = raise_on_post
+        self.calls: list[tuple[str, dict]] = []
+
+    def __call__(self, *, access_token: str, api_base_url: str) -> "_FakeMastodon":
+        self.access_token = access_token
+        self.api_base_url = api_base_url
+        return self
+
+    def status_post(self, status: str, **kwargs) -> None:
+        self.calls.append((status, kwargs))
+        if self.raise_on_post is not None:
+            raise self.raise_on_post
+
+
+@pytest.fixture()
+def full_config(env_setup, tmp_path: Path):
+    os.environ["DATA_DIR"] = str(tmp_path)
+    return load_config()
+
+
+def test_slugify_title_basic_ascii() -> None:
+    assert slugify_title("Hello, World!") == "hello-world"
+
+
+def test_slugify_title_collapses_repeats_and_trims() -> None:
+    assert slugify_title("!!!Foo---Bar???") == "foo-bar"
+    assert slugify_title("---trim---me---") == "trim-me"
+
+
+def test_build_status_text_single_post_layout() -> None:
+    match = _make_match("2016/2016-08-04-foo.md", "Foo")
+    status = build_status_text(
+        "Heute vor 10 Jahren:", [match], "#throwback,#10backward"
+    )
+    assert status == (
+        "Heute vor 10 Jahren:\n\n"
+        "Foo\nhttps://blog.example.com/2016/08/04/foo/\n\n"
+        "#throwback #10backward\n"
+    )
+
+
+def test_build_status_text_multiple_posts_combined() -> None:
+    match_a = _make_match("2016/2016-08-04-a.md", "Alpha")
+    match_b = _make_match("2016/2016-08-04-b.md", "Bravo")
+    status = build_status_text("P:", [match_a, match_b], "#x")
+    assert "Alpha" in status
+    assert "Bravo" in status
+    assert match_a.url in status
+    assert match_b.url in status
+    assert status.count("Alpha") == 1
+    assert status.count("Bravo") == 1
+    assert status.count(match_a.url) == 1
+    assert status.count(match_b.url) == 1
+
+
+def test_build_status_text_empty_posts_raises() -> None:
+    with pytest.raises(PublishError):
+        build_status_text("P:", [], "#x")
+
+
+def test_build_status_text_preserves_deterministic_order() -> None:
+    match_a = _make_match("2016/2016-08-05-a.md", "Alpha", day=5)
+    match_b = _make_match("2016/2016-08-04-b.md", "Bravo", day=4)
+    forward = build_status_text("P:", [match_a, match_b], "#x")
+    reverse = build_status_text("P:", [match_b, match_a], "#x")
+    assert forward == reverse
+    assert forward.index("Bravo") < forward.index("Alpha")
+
+
+def test_validate_status_within_limit() -> None:
+    validate_status("a" * 480)
+
+
+def test_validate_status_over_limit_raises_and_does_not_truncate() -> None:
+    long = "a" * (MASTODON_STATUS_LIMIT + 1)
+    with pytest.raises(PublishError):
+        validate_status(long)
+    assert len(long) == MASTODON_STATUS_LIMIT + 1
+
+
+def test_publish_mastodon_success_invokes_client_with_composed_status(
+    full_config,
+) -> None:
+    match = _make_match("2016/2016-08-04-foo.md", "Foo")
+    fake = _FakeMastodon()
+
+    result = publish_mastodon(full_config, [match], client_factory=fake)
+
+    assert result.endswith("\n")
+    assert fake.calls, "status_post must be invoked"
+    posted_status, posted_kwargs = fake.calls[0]
+    assert posted_status == result
+    assert posted_kwargs == {"visibility": "public"}
+    assert fake.api_base_url == "https://mastodon.example"
+    assert fake.access_token == "test-token"
+
+
+def test_publish_mastodon_api_failure_raises_and_does_not_persist(
+    full_config, tmp_path: Path
+) -> None:
+    match = _make_match("2016/2016-08-04-foo.md", "Foo")
+    fake = _FakeMastodon(raise_on_post=RuntimeError("boom"))
+
+    with pytest.raises(PublishError) as exc_info:
+        publish_mastodon(full_config, [match], client_factory=fake)
+
+    assert "publish_failed" in str(exc_info.value)
+    assert isinstance(exc_info.value.__cause__, RuntimeError)
+
+    store = PostedStore(tmp_path)
+    assert not store.is_posted(match.path)
+
+
+def test_publish_mastodon_over_limit_raises_before_api_call(
+    full_config,
+) -> None:
+    long_title = "T" * (MASTODON_STATUS_LIMIT + 1)
+    match = MatchedPost(
+        path="2016/2016-08-04-foo.md",
+        title=long_title,
+        date=date(2016, 8, 4),
+        url="https://blog.example.com/2016/08/04/foo/",
+    )
+    fake = _FakeMastodon()
+
+    with pytest.raises(PublishError):
+        publish_mastodon(full_config, [match], client_factory=fake)
+
+    assert fake.calls == []
+
+
+def test_publish_mastodon_combined_status_for_multiple_matches(full_config) -> None:
+    match_a = _make_match("2016/2016-08-04-a.md", "Alpha")
+    match_b = _make_match("2016/2016-08-04-b.md", "Bravo")
+    fake = _FakeMastodon()
+
+    publish_mastodon(full_config, [match_a, match_b], client_factory=fake)
+
+    assert len(fake.calls) == 1
+    status, _ = fake.calls[0]
+    assert "Alpha" in status
+    assert "Bravo" in status
+    assert match_a.url in status
+    assert match_b.url in status
+
+
+def test_publish_mastodon_uses_config_visibility(env_setup, tmp_path: Path) -> None:
+    os.environ["VISIBILITY"] = "unlisted"
+    os.environ["DATA_DIR"] = str(tmp_path)
+    config = load_config()
+    match = _make_match("2016/2016-08-04-foo.md", "Foo")
+    fake = _FakeMastodon()
+
+    publish_mastodon(config, [match], client_factory=fake)
+
+    assert fake.calls[0][1] == {"visibility": "unlisted"}