1 files changed, 64 insertions, 0 deletions
diff --git a/browser/base/content/test/sidebar/browser_sidebar_switcher.js b/browser/base/content/test/sidebar/browser_sidebar_switcher.js
new file mode 100644
index 0000000000..dce5821394
--- /dev/null
+++ b/browser/base/content/test/sidebar/browser_sidebar_switcher.js
@@ -0,0 +1,64 @@
+registerCleanupFunction(() => {
+  SidebarUI.hide();
+});
+
+function showSwitcherPanelPromise() {
+  return new Promise(resolve => {
+    SidebarUI._switcherPanel.addEventListener(
+      "popupshown",
+      () => {
+        resolve();
+      },
+      { once: true }
+    );
+    SidebarUI.showSwitcherPanel();
+  });
+}
+
+function clickSwitcherButton(querySelector) {
+  let sidebarPopup = document.querySelector("#sidebarMenu-popup");
+  let switcherPromise = Promise.all([
+    BrowserTestUtils.waitForEvent(window, "SidebarFocused"),
+    BrowserTestUtils.waitForEvent(sidebarPopup, "popuphidden"),
+  ]);
+  document.querySelector(querySelector).click();
+  return switcherPromise;
+}
+
+add_task(async function() {
+  // If a sidebar is already open, close it.
+  if (!document.getElementById("sidebar-box").hidden) {
+    ok(
+      false,
+      "Unexpected sidebar found - a previous test failed to cleanup correctly"
+    );
+    SidebarUI.hide();
+  }
+
+  let sidebar = document.querySelector("#sidebar-box");
+  await SidebarUI.show("viewBookmarksSidebar");
+
+  await showSwitcherPanelPromise();
+  await clickSwitcherButton("#sidebar-switcher-history");
+  is(
+    sidebar.getAttribute("sidebarcommand"),
+    "viewHistorySidebar",
+    "History sidebar loaded"
+  );
+
+  await showSwitcherPanelPromise();
+  await clickSwitcherButton("#sidebar-switcher-tabs");
+  is(
+    sidebar.getAttribute("sidebarcommand"),
+    "viewTabsSidebar",
+    "Tabs sidebar loaded"
+  );
+
+  await showSwitcherPanelPromise();
+  await clickSwitcherButton("#sidebar-switcher-bookmarks");
+  is(
+    sidebar.getAttribute("sidebarcommand"),
+    "viewBookmarksSidebar",
+    "Bookmarks sidebar loaded"
+  );
+});