test: mock nodemailer network calls (#9957)

In tests, nodemailer was making network calls to create test accounts
using ethereal.email. This mocks them appropriately.

Author: denolfe

packages/payload-cloud/src/email.spec.ts

@@ -1,6 +1,7 @@
 import type { Config, Payload } from 'payload'
 
 import { jest } from '@jest/globals'
+import nodemailer from 'nodemailer'
 import { defaults } from 'payload'
 
 import { payloadCloudEmail } from './email.js'
@@ -13,6 +14,20 @@ describe('email', () => {
 
   const mockedPayload: Payload = jest.fn() as unknown as Payload
 
+  beforeAll(() => {
+    // Mock createTestAccount to prevent calling external services
+    jest.spyOn(nodemailer, 'createTestAccount').mockImplementation(() => {
+      return Promise.resolve({
+        imap: { host: 'imap.test.com', port: 993, secure: true },
+        pass: 'testpass',
+        pop3: { host: 'pop3.test.com', port: 995, secure: true },
+        smtp: { host: 'smtp.test.com', port: 587, secure: false },
+        user: 'testuser',
+        web: 'https://webmail.test.com',
+      })
+    })
+  })
+
   beforeEach(() => {
     defaultConfig = defaults as Config
   })

packages/payload-cloud/src/plugin.spec.ts

@@ -14,6 +14,20 @@ describe('plugin', () => {
 
   const skipVerify = true
 
+  beforeAll(() => {
+    // Mock createTestAccount to prevent calling external services
+    jest.spyOn(nodemailer, 'createTestAccount').mockImplementation(() => {
+      return Promise.resolve({
+        imap: { host: 'imap.test.com', port: 993, secure: true },
+        pass: 'testpass',
+        pop3: { host: 'pop3.test.com', port: 995, secure: true },
+        smtp: { host: 'smtp.test.com', port: 587, secure: false },
+        user: 'testuser',
+        web: 'https://webmail.test.com',
+      })
+    })
+  })
+
   beforeEach(() => {
     createTransportSpy = jest.spyOn(nodemailer, 'createTransport').mockImplementationOnce(() => {
       return {

pnpm-lock.yaml

@@ -1,6 +1,8 @@
 import console from 'console'
 global.console = console
 
+import nodemailer from 'nodemailer'
+
 import { generateDatabaseAdapter } from './generateDatabaseAdapter.js'
 
 process.env.PAYLOAD_DISABLE_ADMIN = 'true'
@@ -11,6 +13,18 @@ process.env.PAYLOAD_PUBLIC_CLOUD_STORAGE_ADAPTER = 's3'
 process.env.NODE_OPTIONS = '--no-deprecation'
 process.env.PAYLOAD_CI_DEPENDENCY_CHECKER = 'true'
 
+// Mock createTestAccount to prevent calling external services
+jest.spyOn(nodemailer, 'createTestAccount').mockImplementation(() => {
+  return Promise.resolve({
+    imap: { host: 'imap.test.com', port: 993, secure: true },
+    pass: 'testpass',
+    pop3: { host: 'pop3.test.com', port: 995, secure: true },
+    smtp: { host: 'smtp.test.com', port: 587, secure: false },
+    user: 'testuser',
+    web: 'https://webmail.test.com',
+  })
+})
+
 const dbAdapter = process.env.PAYLOAD_DATABASE || 'mongodb'
 
 generateDatabaseAdapter(dbAdapter)

test/jest.setup.js

@@ -70,6 +70,7 @@
     "jwt-decode": "4.0.0",
     "mongoose": "8.8.3",
     "next": "15.0.3",
+    "nodemailer": "6.9.10",
     "payload": "workspace:*",
     "qs-esm": "7.0.2",
     "react": "19.0.0",