diff --git a/apps/client/src/services/bundle.spec.ts b/apps/client/src/services/bundle.spec.ts
new file mode 100644
index 000000000..70f574b01
--- /dev/null
+++ b/apps/client/src/services/bundle.spec.ts
@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import { Bundle, executeBundle } from "./bundle";
+import { buildNote } from "../test/easy-froca";
+
+describe("Script bundle", () => {
+    it("dayjs is available", async () => {
+        const script = /* js */`return api.dayjs().format("YYYY-MM-DD");`;
+        const bundle = getBundle(script);
+        const result = await executeBundle(bundle, null, $());
+        expect(result).toMatch(/^\d{4}-\d{2}-\d{2}$/);
+    });
+
+    it("dayjs is-same-or-before plugin exists", async () => {
+        const script = /* js */`return api.dayjs("2023-10-01").isSameOrBefore(api.dayjs("2023-10-02"));`;
+        const bundle = getBundle(script);
+        const result = await executeBundle(bundle, null, $());
+        expect(result).toBe(true);
+    });
+});
+
+function getBundle(script: string) {
+    const id = buildNote({
+        title: "Script note"
+    }).noteId;
+    const bundle: Bundle = {
+        script: `\napiContext.modules['${id}'] = { exports: {} };\nreturn await ((async function(exports, module, require, api) {\ntry {\n${script}\n;\n} catch (e) { throw new Error(\"Load of script note \\\"Client\\\" (${id}) failed with: \" + e.message); }\nfor (const exportKey in exports) module.exports[exportKey] = exports[exportKey];\nreturn module.exports;\n}).call({}, {}, apiContext.modules['${id}'], apiContext.require([]), apiContext.apis['${id}']));\n`,
+        html: "",
+        noteId: id,
+        allNoteIds: [ id ]
+    };
+    return bundle;
+}
diff --git a/apps/client/src/services/bundle.ts b/apps/client/src/services/bundle.ts
index e7b88a343..def3156ab 100644
--- a/apps/client/src/services/bundle.ts
+++ b/apps/client/src/services/bundle.ts
@@ -27,7 +27,7 @@ async function getAndExecuteBundle(noteId: string, originEntity = null, script =
     return await executeBundle(bundle, originEntity);
 }
 
-async function executeBundle(bundle: Bundle, originEntity?: Entity | null, $container?: JQuery<HTMLElement>) {
+export async function executeBundle(bundle: Bundle, originEntity?: Entity | null, $container?: JQuery<HTMLElement>) {
     const apiContext = await ScriptContext(bundle.noteId, bundle.allNoteIds, originEntity, $container);
 
     try {