fix: clean up iCloud forward mailbox provider tech debt

tests/mail-provider-utils.test.js

@@ -3,7 +3,11 @@ const assert = require('node:assert/strict');
 
 const {
   HOTMAIL_PROVIDER,
+  getIcloudForwardMailConfig,
+  getIcloudForwardMailProviderOptions,
   getMailProviderConfig,
+  normalizeIcloudForwardMailProvider,
+  normalizeIcloudTargetMailboxType,
   normalizeMailProvider,
 } = require('../mail-provider-utils.js');
 
@@ -33,3 +37,29 @@ test('getMailProviderConfig preserves the hotmail provider sentinel', () => {
     }
   );
 });
+
+test('iCloud forward mailbox helpers normalize and expose supported providers', () => {
+  assert.equal(normalizeIcloudTargetMailboxType('forward-mailbox'), 'forward-mailbox');
+  assert.equal(normalizeIcloudTargetMailboxType('unknown'), 'icloud-inbox');
+  assert.equal(normalizeIcloudForwardMailProvider('GMAIL'), 'gmail');
+  assert.equal(normalizeIcloudForwardMailProvider('unknown'), 'qq');
+  assert.deepEqual(
+    getIcloudForwardMailProviderOptions().map((option) => option.value),
+    ['qq', '163', '163-vip', '126', 'gmail']
+  );
+});
+
+test('getIcloudForwardMailConfig reuses shared mailbox provider configs', () => {
+  assert.deepEqual(getIcloudForwardMailConfig('126'), {
+    source: 'mail-163',
+    url: 'https://mail.126.com/js6/main.jsp?df=mail163_letter#module=mbox.ListModule%7C%7B%22fid%22%3A1%2C%22order%22%3A%22date%22%2C%22desc%22%3Atrue%7D',
+    label: '126 邮箱',
+  });
+  assert.deepEqual(getIcloudForwardMailConfig('gmail'), {
+    source: 'gmail-mail',
+    url: 'https://mail.google.com/mail/u/0/#inbox',
+    label: 'Gmail 邮箱',
+    inject: ['content/activation-utils.js', 'content/utils.js', 'content/gmail-mail.js'],
+    injectSource: 'gmail-mail',
+  });
+});