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diff --git a/comm/mailnews/base/test/unit/test_accountMgrCustomTypes.js b/comm/mailnews/base/test/unit/test_accountMgrCustomTypes.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This tests that accounts with invalid types, such as could be created
+ *  from an extension, do not disappear immediately when the extension
+ *  is unloaded.
+ *
+ * Adapted from test_AccountMgr.js by Kent James <kent@caspia.com>
+ */
+
+function run_test() {
+  Services.prefs.setCharPref("mail.account.account1.identities", "id1");
+  Services.prefs.setCharPref("mail.account.account1.server", "server1");
+  Services.prefs.setCharPref("mail.account.account2.identities", "id2");
+  Services.prefs.setCharPref("mail.account.account2.server", "server2");
+  Services.prefs.setCharPref("mail.server.server1.hostname", "Local Folders");
+  Services.prefs.setCharPref("mail.server.server1.type", "none");
+  Services.prefs.setCharPref("mail.server.server1.userName", "nobody");
+  Services.prefs.setCharPref(
+    "mail.server.server1.directory-rel",
+    "[ProfD]Mail/Local Folders"
+  );
+
+  // Here we are simulating a server and account that is added by an
+  // extension, but that extension is currently unloaded. The extension
+  // added "secondsToLeaveUnavailable" (though a typical value would be
+  // one month, not 2 seconds!) to tell the core code to leave this alone
+  // for awhile if the extension is unloaded.
+  Services.prefs.setCharPref("mail.server.server2.hostname", "pop3.host.org");
+  Services.prefs.setCharPref("mail.server.server2.type", "invalid");
+  Services.prefs.setIntPref("mail.server.server2.secondsToLeaveUnavailable", 2);
+
+  Services.prefs.setCharPref(
+    "mail.accountmanager.accounts",
+    "account2,account1"
+  );
+  Services.prefs.setCharPref("mail.accountmanager.defaultaccount", "account1");
+
+  // This will force the load of the accounts setup above.
+  // We don't see the invalid account.
+  Assert.equal(MailServices.accounts.accounts.length, 1);
+
+  // But it is really there.
+  Assert.equal(
+    Services.prefs.getCharPref("mail.accountmanager.accounts"),
+    "account2,account1"
+  );
+
+  // Add a new account (so that we can check if this clobbers the existing
+  // inactive account or its server).
+  let newAccount = MailServices.accounts.createAccount();
+  let newIdentity = MailServices.accounts.createIdentity();
+  newAccount.addIdentity(newIdentity);
+  newAccount.defaultIdentity = newIdentity;
+  newAccount.incomingServer = MailServices.accounts.createIncomingServer(
+    "somename",
+    "somehost.example.com",
+    "pop3"
+  );
+
+  // No collisions with the inactive account.
+  Assert.notEqual(newIdentity.key, "id2");
+  Assert.notEqual(newAccount.incomingServer.key, "server2");
+  Assert.notEqual(newAccount.key, "account2");
+  Assert.equal(MailServices.accounts.accounts.length, 2);
+
+  MailServices.accounts.unloadAccounts();
+
+  // Set the unavailable account to a valid type, and watch it appear.
+  Services.prefs.setCharPref("mail.server.server2.type", "pop3");
+  Assert.equal(MailServices.accounts.accounts.length, 3);
+
+  // Make it bad again, and reload it to restart the timeout before delete.
+  MailServices.accounts.unloadAccounts();
+  Services.prefs.setCharPref("mail.server.server2.type", "invalid");
+  Assert.equal(MailServices.accounts.accounts.length, 2);
+  MailServices.accounts.unloadAccounts();
+
+  // Now let the bad type timeout, and watch it magically disappear!
+  do_test_pending();
+  do_timeout(3000, function () {
+    Assert.equal(MailServices.accounts.accounts.length, 2);
+
+    // It is now gone.
+    Assert.equal(
+      Services.prefs.getCharPref("mail.accountmanager.accounts"),
+      newAccount.key + ",account1"
+    );
+
+    do_test_finished();
+  });
+}