test: cover the validator, the directory and the site

tests/test_data.py

@@ -0,0 +1,30 @@
+"""The packaged copies of the stylesheet and the DTD, against their originals.
+
+The validator has to find both when it is installed as a wheel with nothing but
+the package on disk, so mews/data holds copies. They must not drift.
+"""
+
+from importlib import resources
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+
+COPIES = {
+    "mews-0.1.css": ROOT / "mews-0.1.css",
+    "mews-0.1.dtd": ROOT / "dtd" / "mews-0.1.dtd",
+}
+
+
+def test_packaged_copies_match_the_originals():
+    for name, original in COPIES.items():
+        packaged = resources.files("mews.data").joinpath(name).read_bytes()
+        assert packaged == original.read_bytes(), (
+            f"mews/data/{name} differs from {original}. Copy the original over it."
+        )
+
+
+def test_the_spec_quotes_the_same_stylesheet():
+    """SPEC.md 5.1 prints the stylesheet in full; it has to be the same file."""
+    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()