1 files changed, 18 insertions, 0 deletions
diff --git a/packages/astro/test/fixtures/astro-markdown-plugins/add-classes.mjs b/packages/astro/test/fixtures/astro-markdown-plugins/add-classes.mjs
new file mode 100644
index 000000000..39acabd52
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-markdown-plugins/add-classes.mjs
@@ -0,0 +1,18 @@
+import { selectAll } from 'hast-util-select';
+
+export default (additions) => {
+	const adders = Object.entries(additions).map(adder);
+	return (node) => adders.forEach((a) => a(node));
+};
+
+const adder = ([selector, className]) => {
+	const writer = write(className);
+	return (node) => selectAll(selector, node).forEach(writer);
+};
+
+const write =
+	(className) =>
+	({ properties }) => {
+		if (!properties.className) properties.className = className;
+		else properties.className += ` ${className}`;
+	};