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diff --git a/comm/mailnews/base/test/unit/test_testsuite_fakeserver_imapd_list-extended.js b/comm/mailnews/base/test/unit/test_testsuite_fakeserver_imapd_list-extended.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/. */
+
+// Test that Imapd.jsm fakeserver correctly implements LIST-EXTENDED imap
+// extension (RFC 5258 - http://tools.ietf.org/html/rfc5258)
+
+// IMAP pump
+var { IMAPPump, setupIMAPPump, teardownIMAPPump } = ChromeUtils.import(
+  "resource://testing-common/mailnews/IMAPpump.jsm"
+);
+var { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+// Globals
+
+// Dovecot is one of the servers that supports LIST-EXTENDED
+setupIMAPPump("Dovecot");
+// create our own handler so that we can call imapd functions directly
+var handler;
+
+add_setup(function () {
+  Services.prefs.setBoolPref(
+    "mail.server.server1.autosync_offline_stores",
+    false
+  );
+});
+
+// mbox mailboxes cannot contain both child mailboxes and messages, so this will
+// be one test case.
+add_setup(async function () {
+  IMAPPump.mailbox.flags = ["\\Marked", "\\NoInferiors"];
+  IMAPPump.mailbox.subscribed = true;
+  IMAPPump.daemon.createMailbox("Fruit", {});
+  IMAPPump.daemon.createMailbox("Fruit/Apple", {});
+  IMAPPump.daemon.createMailbox("Fruit/Banana", { subscribed: true });
+  IMAPPump.daemon.createMailbox("Fruit/Peach", {
+    nonExistent: true,
+    subscribed: true,
+  });
+  IMAPPump.daemon.createMailbox("Tofu", {});
+  IMAPPump.daemon.createMailbox("Vegetable", { subscribed: true });
+  IMAPPump.daemon.createMailbox("Vegetable/Broccoli", { subscribed: true });
+  IMAPPump.daemon.createMailbox("Vegetable/Corn", {});
+
+  handler = IMAPPump.server._handlerCreator(IMAPPump.daemon);
+  let response = handler.onError("1", "LOGIN user password");
+  Assert.ok(response.includes("OK"));
+  // wait for imap pump to do it's thing or else we get memory leaks
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.updateFolderWithListener(null, listener);
+  await listener.promise;
+});
+
+// test that 'LIST "" "*"' returns the proper responses (standard LIST usage)
+add_task(function testList() {
+  let response = handler.onError("2", 'LIST "" "*"');
+
+  Assert.ok(response.includes('* LIST (\\Marked \\NoInferiors) "/" "INBOX"'));
+  Assert.ok(response.includes('* LIST () "/" "Fruit"'));
+  Assert.ok(response.includes('* LIST () "/" "Fruit/Apple"'));
+  Assert.ok(response.includes('* LIST () "/" "Fruit/Banana"'));
+  Assert.ok(response.includes('* LIST () "/" "Tofu"'));
+  Assert.ok(response.includes('* LIST () "/" "Vegetable"'));
+  Assert.ok(response.includes('* LIST () "/" "Vegetable/Broccoli"'));
+  Assert.ok(response.includes('* LIST () "/" "Vegetable/Corn"'));
+  Assert.ok(!response.includes("Peach"));
+});
+
+// test that 'LIST (SUBSCRIBED) "" "*"' returns the proper responses
+add_task(function testListSelectSubscribed() {
+  let response = handler.onError("3", 'LIST (SUBSCRIBED) "" "*"');
+
+  Assert.ok(
+    response.includes(
+      '* LIST (\\Marked \\NoInferiors \\Subscribed) "/" "INBOX"'
+    )
+  );
+  Assert.ok(response.includes('* LIST (\\Subscribed) "/" "Fruit/Banana"'));
+  Assert.ok(
+    response.includes('* LIST (\\Subscribed \\NonExistent) "/" "Fruit/Peach"')
+  );
+  Assert.ok(response.includes('* LIST (\\Subscribed) "/" "Vegetable"'));
+  Assert.ok(
+    response.includes('* LIST (\\Subscribed) "/" "Vegetable/Broccoli"')
+  );
+  Assert.ok(!response.includes('"Fruit"'));
+  Assert.ok(!response.includes("Apple"));
+  Assert.ok(!response.includes("Tofu"));
+  Assert.ok(!response.includes("Corn"));
+});
+
+// test that 'LIST "" "%" RETURN (CHILDEREN)' returns the proper responses
+add_task(function testListReturnChilderen() {
+  let response = handler.onError("4", 'LIST "" "%" RETURN (CHILDREN)');
+
+  Assert.ok(response.includes('* LIST (\\Marked \\NoInferiors) "/" "INBOX"'));
+  Assert.ok(response.includes('* LIST (\\HasChildren) "/" "Fruit"'));
+  Assert.ok(response.includes('* LIST (\\HasNoChildren) "/" "Tofu"'));
+  Assert.ok(response.includes('* LIST (\\HasChildren) "/" "Vegetable"'));
+  Assert.ok(!response.includes("Apple"));
+  Assert.ok(!response.includes("Banana"));
+  Assert.ok(!response.includes("Peach"));
+  Assert.ok(!response.includes("Broccoli"));
+  Assert.ok(!response.includes("Corn"));
+});
+
+// test that 'LIST "" "*" RETURN (SUBSCRIBED)' returns the proper responses
+add_task(function testListReturnSubscribed() {
+  let response = handler.onError("5", 'LIST "" "*" RETURN (SUBSCRIBED)');
+
+  Assert.ok(
+    response.includes(
+      '* LIST (\\Marked \\NoInferiors \\Subscribed) "/" "INBOX"'
+    )
+  );
+  Assert.ok(response.includes('* LIST () "/" "Fruit"'));
+  Assert.ok(response.includes('* LIST () "/" "Fruit/Apple"'));
+  Assert.ok(response.includes('* LIST (\\Subscribed) "/" "Fruit/Banana"'));
+  Assert.ok(response.includes('* LIST () "/" "Tofu"'));
+  Assert.ok(response.includes('* LIST (\\Subscribed) "/" "Vegetable"'));
+  Assert.ok(
+    response.includes('* LIST (\\Subscribed) "/" "Vegetable/Broccoli"')
+  );
+  Assert.ok(response.includes('* LIST () "/" "Vegetable/Corn"'));
+  Assert.ok(!response.includes("Peach"));
+});
+
+// test that 'LIST "" ("INBOX" "Tofu" "Vegetable/%")' returns the proper responses
+add_task(function testListSelectMultiple() {
+  let response = handler._dispatchCommand("LIST", [
+    "",
+    '("INBOX" "Tofu" "Vegetable/%")',
+  ]);
+
+  Assert.ok(response.includes('* LIST (\\Marked \\NoInferiors) "/" "INBOX"'));
+  Assert.ok(response.includes('* LIST () "/" "Tofu"'));
+  Assert.ok(response.includes('* LIST () "/" "Vegetable/Broccoli"'));
+  Assert.ok(response.includes('* LIST () "/" "Vegetable/Corn"'));
+  Assert.ok(!response.includes('"Vegetable"'));
+  Assert.ok(!response.includes("Fruit"));
+  Assert.ok(!response.includes("Peach"));
+});
+
+// Cleanup at end
+add_task(function endTest() {
+  handler = null;
+  teardownIMAPPump();
+});