diff --git a/test/utils.ts b/test/utils.ts
new file mode 100644
index 0000000..a0b90bb
--- /dev/null
+++ b/test/utils.ts
@@ -0,0 +1,9 @@
+import { assertEquals } from "https://deno.land/std@0.177.0/testing/asserts.ts";
+
+import { parseYoutubeId } from "../utils.ts";
+
+Deno.test("parseYoutubeId", () => {
+  const url = parseYoutubeId("https://www.youtube.com/watch?v=ylAF0WNvLx0");
+
+  assertEquals(url, "ylAF0WNvLx0");
+});
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