test(cron): add Vitest unit tests for cron plugin (fixes #71)

plugins/cron/index.test.ts

@@ -0,0 +1,55 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { CronPlugin, CronEventPayload } from './index'
+
+describe('CronPlugin - Initialization', () => {
+    it('should initialize with correct plugin name, prefix and auth requirement', () => {
+        const plugin = new CronPlugin()
+        expect(plugin).toBeInstanceOf(CronPlugin)
+        expect(plugin.name).toBe('starbasedb:cron')
+        expect(plugin.pathPrefix).toBe('/cron')
+        expect(plugin.options?.requiresAuth).toBe(true)
+    })
+})
+
+describe('CronPlugin - Event Subscription & Emission', () => {
+    let plugin: CronPlugin
+
+    beforeEach(() => {
+        plugin = new CronPlugin()
+    })
+
+    it('should register event listener via on() and trigger on emit()', () => {
+        const mockCallback = vi.fn()
+        plugin.on(mockCallback)
+
+        const testPayload: CronEventPayload = {
+            name: 'cleanup_job',
+            cron_tab: '0 0 * * *',
+            payload: { action: 'purge_temp' },
+        }
+
+        plugin.emit(testPayload)
+
+        expect(mockCallback).toHaveBeenCalledTimes(1)
+        expect(mockCallback).toHaveBeenCalledWith(testPayload)
+    })
+
+    it('should support multiple registered event listeners', () => {
+        const cb1 = vi.fn()
+        const cb2 = vi.fn()
+
+        plugin.on(cb1)
+        plugin.on(cb2)
+
+        const testPayload: CronEventPayload = {
+            name: 'daily_summary',
+            cron_tab: '@daily',
+            payload: { metrics: true },
+        }
+
+        plugin.emit(testPayload)
+
+        expect(cb1).toHaveBeenCalledWith(testPayload)
+        expect(cb2).toHaveBeenCalledWith(testPayload)
+    })
+})