diff --git a/dbal/ts/tests/core/validation/is-valid-email.test.ts b/dbal/ts/tests/core/validation/is-valid-email.test.ts
index 304e33e08..f45817a5d 100644
--- a/dbal/ts/tests/core/validation/is-valid-email.test.ts
+++ b/dbal/ts/tests/core/validation/is-valid-email.test.ts
@@ -2,10 +2,13 @@ import { describe, it, expect } from 'vitest'
 import { isValidEmail } from '../../../src/core/validation/is-valid-email'
 
 describe('isValidEmail', () => {
+  const longEmail = `${'a'.repeat(250)}@example.com`
+
   it.each([
     { email: 'user@example.com', expected: true, description: 'basic email' },
     { email: 'user.name+tag@example.co.uk', expected: true, description: 'subdomain with plus tag' },
     { email: 'user_name-123@example-domain.com', expected: true, description: 'underscore and hyphen' },
+    { email: longEmail, expected: false, description: 'too long' },
     { email: 'user@domain', expected: false, description: 'missing top level domain' },
     { email: 'user@domain.c', expected: false, description: 'tld too short' },
     { email: 'user@domain.123', expected: false, description: 'numeric tld' },