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diff --git a/comm/mailnews/imap/test/unit/test_mailboxes.js b/comm/mailnews/imap/test/unit/test_mailboxes.js
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+++ b/comm/mailnews/imap/test/unit/test_mailboxes.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/. */
+
+/**
+ * Tests basic mailbox handling of IMAP, like discovery, rename and empty folder.
+ */
+
+var { MessageGenerator } = ChromeUtils.import(
+  "resource://testing-common/mailnews/MessageGenerator.jsm"
+);
+var { PromiseTestUtils } = ChromeUtils.import(
+  "resource://testing-common/mailnews/PromiseTestUtils.jsm"
+);
+
+// The following folder names are not pure ASCII and will be MUTF-7 encoded.
+const folderName1 = "I18N box\u00E1"; // I18N boxá
+const folderName2 = "test \u00E4"; // test ä
+
+add_setup(async function () {
+  setupIMAPPump();
+
+  IMAPPump.daemon.createMailbox(folderName1, { subscribed: true });
+  IMAPPump.daemon.createMailbox("Unsubscribed box");
+  // Create an all upper case trash folder name to make sure
+  // we handle special folder names case-insensitively.
+  IMAPPump.daemon.createMailbox("TRASH", { subscribed: true });
+
+  // Get the server list...
+  IMAPPump.server.performTest("LIST");
+
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.updateFolderWithListener(null, listener);
+  await listener.promise;
+});
+
+add_task(async function checkDiscovery() {
+  let rootFolder = IMAPPump.incomingServer.rootFolder;
+  // Check that we've subscribed to the boxes returned by LSUB. We also get
+  // checking of proper i18n in mailboxes for free here.
+  Assert.ok(rootFolder.containsChildNamed("Inbox"));
+  Assert.ok(rootFolder.containsChildNamed("TRASH"));
+  // Make sure we haven't created an extra "Trash" folder.
+  let trashes = rootFolder.getFoldersWithFlags(Ci.nsMsgFolderFlags.Trash);
+  Assert.equal(trashes.length, 1);
+  Assert.equal(rootFolder.numSubFolders, 3);
+  Assert.ok(rootFolder.containsChildNamed(folderName1));
+  // This is not a subscribed box, so we shouldn't be subscribing to it.
+  Assert.ok(!rootFolder.containsChildNamed("Unsubscribed box"));
+
+  let i18nChild = rootFolder.getChildNamed(folderName1);
+
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  MailServices.imap.renameLeaf(i18nChild, folderName2, listener, null);
+  await listener.promise;
+});
+
+add_task(async function checkRename() {
+  let rootFolder = IMAPPump.incomingServer.rootFolder;
+  Assert.ok(rootFolder.containsChildNamed(folderName2));
+  let newChild = rootFolder
+    .getChildNamed(folderName2)
+    .QueryInterface(Ci.nsIMsgImapMailFolder);
+  let listener = new PromiseTestUtils.PromiseUrlListener();
+  newChild.updateFolderWithListener(null, listener);
+  await listener.promise;
+});
+
+add_task(function checkEmptyFolder() {
+  try {
+    let serverSink = IMAPPump.server.QueryInterface(Ci.nsIImapServerSink);
+    serverSink.possibleImapMailbox("/", "/", 0);
+  } catch (ex) {
+    // We expect this to fail, but not crash or assert.
+  }
+});
+
+add_task(function endTest() {
+  teardownIMAPPump();
+});