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diff --git a/comm/mailnews/imap/test/unit/test_listSubscribed.js b/comm/mailnews/imap/test/unit/test_listSubscribed.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 listing subscribed mailboxes uses LIST (SUBSCRIBED) instead of LSUB
+ * for servers that have LIST-EXTENDED capability
+ */
+/* References:
+ * RFC 5258 - http://tools.ietf.org/html/rfc5258
+ * Bug 495318
+ * Bug 816028
+ * http://bugzilla.zimbra.com/show_bug.cgi?id=78794
+ */
+
+var { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+add_setup(async function () {
+  // Zimbra is one of the servers that supports LIST-EXTENDED
+  // it also has a bug that causes a server crash in certain setups
+  setupIMAPPump("Zimbra");
+
+  Services.prefs.setBoolPref(
+    "mail.server.server1.autosync_offline_stores",
+    false
+  );
+
+  // Setup the mailboxes that will be used for this test.
+  IMAPPump.mailbox.subscribed = true;
+  IMAPPump.daemon.createMailbox("folder1", {
+    subscribed: true,
+    flags: ["\\Noselect"],
+  });
+  IMAPPump.daemon.createMailbox("folder1/folder11", {
+    subscribed: true,
+    flags: ["\\Noinferiors"],
+  });
+  IMAPPump.daemon.createMailbox("folder2", {
+    subscribed: true,
+    nonExistent: true,
+  });
+  IMAPPump.daemon.createMailbox("folder3", {});
+
+  // select the inbox to force folder discovery, etc.
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.updateFolderWithListener(null, listener);
+  await listener.promise;
+});
+
+// tests that LIST (SUBSCRIBED) returns the proper response
+add_task(async function testListSubscribed() {
+  // check that we have \Noselect and \Noinferiors flags - these would not have
+  // been returned if we had used LSUB instead of LIST(SUBSCRIBED)
+  let rootFolder = IMAPPump.incomingServer.rootFolder;
+  let folder1 = rootFolder.getChildNamed("folder1");
+  Assert.ok(folder1.getFlag(Ci.nsMsgFolderFlags.ImapNoselect));
+  Assert.ok(!folder1.getFlag(Ci.nsMsgFolderFlags.ImapNoinferiors));
+
+  // make sure the above test was not a fluke
+  let folder11 = folder1.getChildNamed("folder11");
+  Assert.ok(!folder11.getFlag(Ci.nsMsgFolderFlags.ImapNoselect));
+  Assert.ok(folder11.getFlag(Ci.nsMsgFolderFlags.ImapNoinferiors));
+
+  // test that \NonExistent implies \Noselect
+  rootFolder.getChildNamed("folder2");
+  Assert.ok(folder1.getFlag(Ci.nsMsgFolderFlags.ImapNoselect));
+
+  // should not get a folder3 since it is not subscribed
+  let folder3;
+  try {
+    folder3 = rootFolder.getChildNamed("folder3");
+  } catch (ex) {}
+  // do_check_false(folder1.getFlag(Ci.nsMsgFolderFlags.Subscribed));
+  Assert.equal(null, folder3);
+});
+
+add_task(async function testZimbraServerVersions() {
+  if (Services.prefs.getBoolPref("mailnews.imap.jsmodule", false)) {
+    return;
+  }
+
+  // older versions of Zimbra can crash if we send LIST (SUBSCRIBED) so we want
+  // to make sure that we are checking for versions
+
+  let testValues = [
+    { version: "6.3.1_GA_2790", expectedResult: false },
+    { version: "7.2.2_GA_2790", expectedResult: false },
+    { version: "7.2.3_GA_2790", expectedResult: true },
+    { version: "8.0.2_GA_2790", expectedResult: false },
+    { version: "8.0.3_GA_2790", expectedResult: true },
+    { version: "9.0.0_GA_2790", expectedResult: true },
+  ];
+
+  for (let i = 0; i < testValues.length; i++) {
+    IMAPPump.daemon.idResponse =
+      '("NAME" "Zimbra" ' +
+      '"VERSION" "' +
+      testValues[i].version +
+      '" ' +
+      '"RELEASE" "20120815212257" ' +
+      '"USER" "user@domain.com" ' +
+      '"SERVER" "14b63305-d002-4f1b-bcd9-23d402d4ef40")';
+    IMAPPump.incomingServer.closeCachedConnections();
+    IMAPPump.incomingServer.performExpand(null);
+    // select inbox is just to wait on performExpand since performExpand does not have listener
+    let listener = new PromiseTestUtils.PromiseUrlListener();
+    IMAPPump.inbox.updateFolderWithListener(null, listener);
+    await listener.promise;
+    // if we send LSUB instead of LIST(SUBSCRIBED), then we should not have \NoSelect flag
+    let rootFolder = IMAPPump.incomingServer.rootFolder;
+    let folder1 = rootFolder.getChildNamed("folder1");
+    Assert.equal(
+      folder1.getFlag(Ci.nsMsgFolderFlags.ImapNoselect),
+      testValues[i].expectedResult
+    );
+  }
+});
+
+// Cleanup at end
+add_task(function endTest() {
+  teardownIMAPPump();
+});