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diff --git a/comm/mail/test/browser/folder-display/browser_openingMessages.js b/comm/mail/test/browser/folder-display/browser_openingMessages.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 we open single and multiple messages from the thread pane
+ * according to the mail.openMessageBehavior preference, and that we have the
+ * correct message headers displayed in whatever we open.
+ *
+ * Currently tested:
+ * - opening single and multiple messages in tabs
+ * - opening a single message in a window. (Multiple messages require a fair
+ *   amount of additional work and are hard to test. We're also assuming here
+ *   that multiple messages opened in windows are just the same function called
+ *   repeatedly.)
+ * - reusing an existing window to show another message
+ */
+
+"use strict";
+
+var {
+  assert_message_pane_focused,
+  assert_number_of_tabs_open,
+  assert_selected_and_displayed,
+  assert_tab_mode_name,
+  assert_tab_titled_from,
+  be_in_folder,
+  close_message_window,
+  close_tab,
+  create_folder,
+  make_message_sets_in_folders,
+  mc,
+  open_selected_message,
+  open_selected_messages,
+  plan_for_message_display,
+  reset_open_message_behavior,
+  select_click_row,
+  select_shift_click_row,
+  set_open_message_behavior,
+  switch_tab,
+  wait_for_message_display_completion,
+} = ChromeUtils.import(
+  "resource://testing-common/mozmill/FolderDisplayHelpers.jsm"
+);
+var { async_plan_for_new_window, wait_for_new_window } = ChromeUtils.import(
+  "resource://testing-common/mozmill/WindowHelpers.jsm"
+);
+
+// One folder's enough
+var folder = null;
+
+// Number of messages to open for multi-message tests
+var NUM_MESSAGES_TO_OPEN = 5;
+
+add_setup(async function () {
+  folder = await create_folder("OpeningMessagesA");
+  await make_message_sets_in_folders([folder], [{ count: 10 }]);
+});
+
+/**
+ * Test opening a single message in a new tab.
+ */
+add_task(async function test_open_single_message_in_tab() {
+  set_open_message_behavior("NEW_TAB");
+  let folderTab = mc.window.document.getElementById("tabmail").currentTabInfo;
+  let preCount =
+    mc.window.document.getElementById("tabmail").tabContainer.allTabs.length;
+  await be_in_folder(folder);
+  // Select one message
+  let msgHdr = select_click_row(1);
+  // Open it
+  open_selected_message();
+  // Check that the tab count has increased by 1
+  assert_number_of_tabs_open(preCount + 1);
+  // Check that the currently displayed tab is a message tab (i.e. our newly
+  // opened tab is in the foreground)
+  assert_tab_mode_name(null, "mailMessageTab");
+
+  let tab = mc.window.document.getElementById("tabmail").currentTabInfo;
+  if (
+    tab.chromeBrowser.docShell.isLoadingDocument ||
+    tab.chromeBrowser.currentURI.spec != "about:message"
+  ) {
+    await BrowserTestUtils.browserLoaded(tab.chromeBrowser);
+  }
+
+  // Check that the message header displayed is the right one
+  assert_selected_and_displayed(msgHdr);
+  // Check that the message pane is focused
+  assert_message_pane_focused();
+  // Clean up, close the tab
+  close_tab(mc.window.document.getElementById("tabmail").currentTabInfo);
+  await switch_tab(folderTab);
+  reset_open_message_behavior();
+});
+
+/**
+ * Test opening multiple messages in new tabs.
+ */
+add_task(async function test_open_multiple_messages_in_tabs() {
+  set_open_message_behavior("NEW_TAB");
+  let folderTab = mc.window.document.getElementById("tabmail").currentTabInfo;
+  let preCount =
+    mc.window.document.getElementById("tabmail").tabContainer.allTabs.length;
+  await be_in_folder(folder);
+
+  // Select a bunch of messages
+  select_click_row(1);
+  let selectedMessages = select_shift_click_row(NUM_MESSAGES_TO_OPEN);
+  // Open them
+  open_selected_messages();
+  // Check that the tab count has increased by the correct number
+  assert_number_of_tabs_open(preCount + NUM_MESSAGES_TO_OPEN);
+  // Check that the currently displayed tab is a message tab (i.e. one of our
+  // newly opened tabs is in the foreground)
+  assert_tab_mode_name(null, "mailMessageTab");
+
+  // Now check whether each of the NUM_MESSAGES_TO_OPEN tabs has the correct
+  // title
+  for (let i = 0; i < NUM_MESSAGES_TO_OPEN; i++) {
+    assert_tab_titled_from(
+      mc.window.document.getElementById("tabmail").tabInfo[preCount + i],
+      selectedMessages[i]
+    );
+  }
+
+  // Check whether each tab has the correct message and whether the message pane
+  // is focused in each case, then close it to load the previous tab.
+  for (let i = 0; i < NUM_MESSAGES_TO_OPEN; i++) {
+    assert_selected_and_displayed(selectedMessages.pop());
+    assert_message_pane_focused();
+    close_tab(mc.window.document.getElementById("tabmail").currentTabInfo);
+  }
+  await switch_tab(folderTab);
+  reset_open_message_behavior();
+});
+
+/**
+ * Test opening a message in a new window.
+ */
+add_task(async function test_open_message_in_new_window() {
+  set_open_message_behavior("NEW_WINDOW");
+  await be_in_folder(folder);
+
+  // Select a message
+  let msgHdr = select_click_row(1);
+
+  let newWindowPromise = async_plan_for_new_window("mail:messageWindow");
+  // Open it
+  open_selected_message();
+  let msgc = await newWindowPromise;
+  wait_for_message_display_completion(msgc, true);
+
+  assert_selected_and_displayed(msgc, msgHdr);
+
+  // Clean up, close the window
+  close_message_window(msgc);
+  reset_open_message_behavior();
+});
+
+/**
+ * Test reusing an existing window to open a new message.
+ */
+add_task(async function test_open_message_in_existing_window() {
+  set_open_message_behavior("EXISTING_WINDOW");
+  await be_in_folder(folder);
+
+  // Open up a window
+  select_click_row(1);
+  let newWindowPromise = async_plan_for_new_window("mail:messageWindow");
+  open_selected_message();
+  let msgc = await newWindowPromise;
+  wait_for_message_display_completion(msgc, true);
+
+  // Select another message and open it
+  let msgHdr = select_click_row(2);
+  plan_for_message_display(msgc);
+  open_selected_message();
+  wait_for_message_display_completion(msgc, true);
+
+  // Check if our old window displays the message
+  assert_selected_and_displayed(msgc, msgHdr);
+  // Clean up, close the window
+  close_message_window(msgc);
+  reset_open_message_behavior();
+});