test(packages/stdlib): add pubsub edge case check

2026-03-20 10:54:44 +00:00 · 2024-10-01 07:13:09 +07:00
parent 307ec29787
commit 61c699381b
1 changed files with 11 additions and 0 deletions
--- a/packages/stdlib/src/patterns/behavioral/pubsub/index.test.ts
+++ b/packages/stdlib/src/patterns/behavioral/pubsub/index.test.ts
@@ -92,4 +92,15 @@ describe('pubsub', () => {

    expect(result).toBe(false);
  });
+
+  it('calls listener only once when the same function is registered multiple times', () => {
+    const listener = vi.fn();
+
+    eventBus.on('event1', listener);
+    eventBus.on('event1', listener);
+    eventBus.on('event1', listener);
+    eventBus.emit('event1', 'Hello');
+
+    expect(listener).toHaveBeenCalledTimes(1);
+  });
 });