fix: ship the real DTD in the Pelican plugin

tests/test_data.py

@@ -14,6 +14,12 @@ COPIES = {
     "mews-0.1.dtd": ROOT / "dtd" / "mews-0.1.dtd",
 }
 
+# The Pelican plugin is a separate distributable package, so it carries its own
+# copy of the DTD rather than importing one. It shipped a hand-written
+# placeholder for a while, which silently stripped tables, ordered lists, forms
+# and the body variant class out of every page it produced.
+PLUGIN_DTD = ROOT / "pelican-mews" / "pelican" / "plugins" / "mews" / "dtd" / "mews.dtd"
+
 
 def test_packaged_copies_match_the_originals():
     for name, original in COPIES.items():
@@ -28,3 +34,10 @@ def test_the_spec_quotes_the_same_stylesheet():
     spec = (ROOT / "doc" / "SPEC.md").read_text()
     quoted = spec.split("```css\n", 1)[1].split("```", 1)[0]
     assert quoted.strip() == (ROOT / "mews-0.1.css").read_text().strip()
+
+
+def test_the_pelican_plugin_bundles_the_real_dtd():
+    canonical = (ROOT / "dtd" / "mews-0.1.dtd").read_bytes()
+    assert PLUGIN_DTD.read_bytes() == canonical, (
+        f"{PLUGIN_DTD} differs from dtd/mews-0.1.dtd. Copy the original over it."
+    )

tests/test_site.py

@@ -24,6 +24,18 @@ def test_the_projects_own_pages_have_no_warnings_either(page):
     assert not report.warnings, "\n".join(str(f) for f in report.warnings)
 
 
+PLUGIN_PAGES = sorted(
+    (ROOT / "pelican-mews" / "tests" / "fixtures").glob("*/expected.xhtml")
+)
+
+
+@pytest.mark.parametrize("page", PLUGIN_PAGES, ids=lambda p: p.parent.name)
+def test_pages_the_pelican_plugin_produces_conform(page):
+    """What the plugin writes has to pass the validator, or it is no use."""
+    report = validate_file(str(page))
+    assert report.conforms, "\n".join(str(f) for f in report.failures)
+
+
 def test_the_dtd_still_matches_the_spec():
     """dtd/check_dtd.py is hand-maintained; keep it running in CI."""
     result = subprocess.run(