diff --git a/tests/server/models/adminAlertDismissal.test.js b/tests/server/models/adminAlertDismissal.test.js
index 0cfce44..0667fc1 100644
--- a/tests/server/models/adminAlertDismissal.test.js
+++ b/tests/server/models/adminAlertDismissal.test.js
@@ -1,4 +1,5 @@
 import { describe, it, expect } from 'vitest'
+import mongoose from 'mongoose'
 import AdminAlertDismissal from '../../../server/models/adminAlertDismissal.js'
 
 describe('AdminAlertDismissal model', () => {
@@ -40,4 +41,13 @@ describe('AdminAlertDismissal model', () => {
     expect(compound).toBeDefined()
     expect(compound[1].unique).toBe(true)
   })
+
+  it('defaults dismissedAt to the current time', () => {
+    const doc = new AdminAlertDismissal({
+      adminId: new mongoose.Types.ObjectId(),
+      alertType: 'slack_invite_failed',
+      signature: 'abc'
+    })
+    expect(doc.dismissedAt).toBeInstanceOf(Date)
+  })
 })