test: add test for mdToHtml

Author: velut

lib/md-to-html.test.ts

@@ -0,0 +1,6 @@
+import { expect, test } from "vitest";
+import { mdToHtml } from "./md-to-html";
+
+test("mdToHtml", async () => {
+	await expect(mdToHtml("**hello**")).resolves.toMatchInlineSnapshot(`"<strong>hello</strong>"`);
+});