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diff --git a/comm/mailnews/imap/test/unit/test_subfolderLocation.js b/comm/mailnews/imap/test/unit/test_subfolderLocation.js
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+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test proper location of new imap offline subfolders for maildir.
+
+// async support
+/* import-globals-from ../../../test/resources/logHelper.js */
+/* import-globals-from ../../../test/resources/alertTestUtils.js */
+load("../../../resources/logHelper.js");
+load("../../../resources/alertTestUtils.js");
+
+// Globals
+
+// Messages to load must have CRLF line endings, that is Windows style
+var gMessage = "bugmail10"; // message file used as the test message
+
+add_task(function () {
+  Services.prefs.setBoolPref(
+    "mail.server.server1.autosync_offline_stores",
+    false
+  );
+  setupIMAPPump();
+});
+
+// load and update a message in the imap fake server
+add_task(async function loadImapMessage() {
+  IMAPPump.mailbox.addMessage(
+    new ImapMessage(specForFileName(gMessage), IMAPPump.mailbox.uidnext++, [])
+  );
+  let promiseUrlListener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.updateFolderWithListener(gDummyMsgWindow, promiseUrlListener);
+  await promiseUrlListener.promise;
+
+  Assert.equal(1, IMAPPump.inbox.getTotalMessages(false));
+  let msgHdr = mailTestUtils.firstMsgHdr(IMAPPump.inbox);
+  Assert.ok(msgHdr instanceof Ci.nsIMsgDBHdr);
+});
+
+add_task(async function downloadOffline() {
+  // ...and download for offline use.
+  let promiseUrlListener = new PromiseTestUtils.PromiseUrlListener();
+  IMAPPump.inbox.downloadAllForOffline(promiseUrlListener, null);
+  await promiseUrlListener.promise;
+});
+
+var folderName1 = "sub1";
+var folderName2 = "sub2";
+
+// use a folder method to add a subfolder
+add_task(async function addSubfolder() {
+  let promiseFolder1 = PromiseTestUtils.promiseFolderAdded(folderName1);
+  IMAPPump.inbox.createSubfolder(folderName1, null);
+  await promiseFolder1;
+});
+
+// use a store method to add a subfolder
+add_task(function storeAddSubfolder() {
+  IMAPPump.incomingServer.msgStore.createFolder(IMAPPump.inbox, folderName2);
+});
+
+// test that folders created with store and folder have the same parent
+add_task(function testSubfolder() {
+  let subfolder1 = IMAPPump.inbox.getChildNamed(folderName1);
+  let subfolder2 = IMAPPump.inbox.getChildNamed(folderName2);
+  Assert.equal(
+    subfolder1.filePath.parent.path,
+    subfolder2.filePath.parent.path
+  );
+});
+
+// Cleanup at end
+add_task(teardownIMAPPump);
+
+/*
+ * helper functions
+ */
+
+// given a test file, return the file uri spec
+function specForFileName(aFileName) {
+  let file = do_get_file("../../../data/" + aFileName);
+  let msgfileuri = Services.io.newFileURI(file).QueryInterface(Ci.nsIFileURL);
+  return msgfileuri.spec;
+}