test: add unknown mark

component/test/components/fixture/src/pages/mark/unknown.astro

@@ -0,0 +1,21 @@
+---
+import Layout from "../../layouts/Default.astro";
+import { PortableText } from "astro-portabletext";
+
+const blocks = [
+  {
+    _type: "block",
+    children: [
+      {
+        _type: "span",
+        text: "highlighted",
+        marks: ["highlight"],
+      },
+    ],
+  },
+];
+---
+
+<Layout>
+  <PortableText value={blocks} />
+</Layout>

component/test/components/mark.test.js

@@ -53,4 +53,14 @@ mark("underline", async () => {
   assert.is($el.attr("style"), "text-decoration: underline;");
 });
 
+mark("unknown", async () => {
+  const $ = await fetchContent("mark/unknown");
+  const $el = $("[data-portabletext-unknown]");
+
+  assert.is($el.length, 1);
+  assert.is($el.attr("data-portabletext-unknown"), "mark");
+  assert.is($el.text(), "highlighted");
+  assert.is($el[0].name, "span");
+});
+
 mark.run();