1 files changed, 37 insertions, 0 deletions
diff --git a/comm/mail/components/preferences/test/browser/browser_openPreferences.js b/comm/mail/components/preferences/test/browser/browser_openPreferences.js
new file mode 100644
index 0000000000..01aceb085a
--- /dev/null
+++ b/comm/mail/components/preferences/test/browser/browser_openPreferences.js
@@ -0,0 +1,37 @@
+/* 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/. */
+
+function getStoredLastSelected() {
+  return Services.xulStore.getValue(
+    "about:preferences",
+    "paneDeck",
+    "lastSelected"
+  );
+}
+
+add_task(async () => {
+  // Check that openPreferencesTab with no arguments and no stored value opens the first pane.
+  Services.xulStore.removeDocument("about:preferences");
+
+  let { prefsWindow } = await openNewPrefsTab();
+  is(prefsWindow.gLastCategory.category, "paneGeneral");
+
+  await closePrefsTab();
+});
+
+add_task(async () => {
+  // Check that openPreferencesTab with one argument opens the right pane…
+  Services.xulStore.removeDocument("about:preferences");
+
+  await openNewPrefsTab("panePrivacy");
+  is(getStoredLastSelected(), "panePrivacy");
+
+  await closePrefsTab();
+
+  // … even with a value in the XULStore.
+  await openNewPrefsTab("paneCompose");
+  is(getStoredLastSelected(), "paneCompose");
+
+  await closePrefsTab();
+});