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diff --git a/comm/mail/test/browser/folder-display/browser_tabsSimple.js b/comm/mail/test/browser/folder-display/browser_tabsSimple.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 opening new folder and message tabs has the expected result and
+ * that closing them doesn't break anything.  sid0 added checks for focus
+ * transitions at one point; I (asuth) am changing our test infrastructure to
+ * cause more realistic focus changes so those changes now look sillier
+ * because in many cases we are explicitly setting focus back after the thread
+ * tree gains focus.
+ */
+
+"use strict";
+
+var {
+  assert_folder_tree_focused,
+  assert_message_pane_focused,
+  assert_messages_in_view,
+  assert_nothing_selected,
+  assert_selected_and_displayed,
+  assert_thread_tree_focused,
+  be_in_folder,
+  close_tab,
+  create_folder,
+  focus_folder_tree,
+  focus_message_pane,
+  focus_thread_tree,
+  make_message_sets_in_folders,
+  mc,
+  open_folder_in_new_tab,
+  open_selected_message_in_new_tab,
+  select_click_row,
+  switch_tab,
+  wait_for_blank_content_pane,
+} = ChromeUtils.import(
+  "resource://testing-common/mozmill/FolderDisplayHelpers.jsm"
+);
+
+var folderA, folderB, setA, setB;
+
+add_setup(async function () {
+  folderA = await create_folder("TabsSimpleA");
+  folderB = await create_folder("TabsSimpleB");
+
+  // We will verify we are seeing the right folder by checking that it has the
+  //  right messages in it.
+  [setA] = await make_message_sets_in_folders([folderA], [{}]);
+  [setB] = await make_message_sets_in_folders([folderB], [{}]);
+});
+
+/** The tabs in our test. */
+var tabFolderA, tabFolderB, tabMessageA, tabMessageB;
+/** The message that we selected for tab display, to check it worked right. */
+var messageA, messageB;
+
+/**
+ * Make sure the default tab works right.
+ */
+add_task(async function test_open_folder_a() {
+  tabFolderA = await be_in_folder(folderA);
+  assert_messages_in_view(setA);
+  assert_nothing_selected();
+  // Focus the folder tree here
+  focus_folder_tree();
+});
+
+/**
+ * Open tab b, make sure it works right.
+ */
+add_task(async function test_open_folder_b_in_tab() {
+  tabFolderB = await open_folder_in_new_tab(folderB);
+  wait_for_blank_content_pane();
+  assert_messages_in_view(setB);
+  assert_nothing_selected();
+  focus_thread_tree();
+});
+
+/**
+ * Go back to tab/folder A and make sure we change correctly.
+ */
+add_task(async function test_switch_to_tab_folder_a() {
+  await switch_tab(tabFolderA);
+  assert_messages_in_view(setA);
+  assert_nothing_selected();
+  assert_folder_tree_focused();
+});
+
+/**
+ * Select a message in folder A and open it in a new window, making sure that
+ *  the displayed message is the right one.
+ */
+add_task(async function test_open_message_a_in_tab() {
+  // (this focuses the thread tree for tabFolderA...)
+  messageA = select_click_row(0);
+  // (...refocus the folder tree for our sticky check below)
+  focus_folder_tree();
+  tabMessageA = await open_selected_message_in_new_tab();
+  assert_selected_and_displayed(messageA);
+  assert_message_pane_focused();
+});
+
+/**
+ * Go back to tab/folder B and make sure we change correctly.
+ */
+add_task(async function test_switch_to_tab_folder_b() {
+  await switch_tab(tabFolderB);
+  assert_messages_in_view(setB);
+  assert_nothing_selected();
+  assert_thread_tree_focused();
+});
+
+/**
+ * Select a message in folder B and open it in a new window, making sure that
+ *  the displayed message is the right one.
+ */
+add_task(async function test_open_message_b_in_tab() {
+  messageB = select_click_row(0);
+  // Let's focus the message pane now
+  focus_message_pane();
+  tabMessageB = await open_selected_message_in_new_tab();
+  assert_selected_and_displayed(messageB);
+  assert_message_pane_focused();
+});
+
+/**
+ * Switch to message tab A.
+ */
+add_task(async function test_switch_to_message_a() {
+  await switch_tab(tabMessageA);
+  assert_selected_and_displayed(messageA);
+  assert_message_pane_focused();
+});
+
+/**
+ * Close message tab A (when it's in the foreground).
+ */
+add_task(function test_close_message_a() {
+  close_tab();
+  // our current tab is now undefined for the purposes of this test.
+});
+
+/**
+ * Make sure all the other tabs are still happy.
+ */
+add_task(async function test_tabs_are_still_happy() {
+  await switch_tab(tabFolderB);
+  assert_messages_in_view(setB);
+  assert_selected_and_displayed(messageB);
+  assert_message_pane_focused();
+
+  await switch_tab(tabMessageB);
+  assert_selected_and_displayed(messageB);
+  assert_message_pane_focused();
+
+  await switch_tab(tabFolderA);
+  assert_messages_in_view(setA);
+  assert_selected_and_displayed(messageA);
+  // focus restoration uses setTimeout(0) and so we need to give it a chance
+  await new Promise(resolve => setTimeout(resolve));
+  assert_folder_tree_focused();
+});
+
+/**
+ * Close message tab B (when it's in the background).
+ */
+add_task(function test_close_message_b() {
+  close_tab(tabMessageB);
+  // we should still be on folder A
+  assert_messages_in_view(setA);
+  assert_selected_and_displayed(messageA);
+  assert_folder_tree_focused();
+});
+
+/**
+ * Switch to tab B, close it, make sure we end up on tab A.
+ */
+add_task(async function test_close_folder_b() {
+  await switch_tab(tabFolderB);
+  assert_messages_in_view(setB);
+  assert_selected_and_displayed(messageB);
+  assert_message_pane_focused();
+
+  close_tab();
+  assert_messages_in_view(setA);
+  assert_selected_and_displayed(messageA);
+  assert_folder_tree_focused();
+
+  Assert.report(
+    false,
+    undefined,
+    undefined,
+    "Test ran to completion successfully"
+  );
+});