Add tests

tests/suite/loading/html.typ

@@ -0,0 +1,46 @@
+--- html ---
+// Test reading XML data.
+#let data = html-decode("/assets/text/example.html")
+#test(data, ((
+  tag: "html",
+  attrs: (:),
+  children: (
+    (
+      tag: "head",
+      attrs: (:),
+      children: (
+        "\n    ",
+        (
+          tag: "meta",
+          attrs: (charset: "UTF-8"),
+          children: (),
+        ),
+        "\n    ",
+        (
+          tag: "title",
+          attrs: (:),
+          children: ("Example document",),
+        ),
+        "\n  ",
+      ),
+    ),
+    "\n  ",
+    (
+      tag: "body",
+      attrs: (:),
+      children: (
+        "\n    ",
+        (
+          tag: "h1",
+          attrs: (:),
+          children: ("Hello, world!",),
+        ),
+        "\n  \n\n",
+      ),
+    ),
+  ),
+),))
+
+--- html-invalid ---
+// Error: 14-38 failed to parse HTML (Unexpected token)
+#html-decode("/assets/text/hello.txt")