1 files changed, 37 insertions, 0 deletions
diff --git a/browser/base/content/test/sidebar/browser_sidebar_persist.js b/browser/base/content/test/sidebar/browser_sidebar_persist.js
new file mode 100644
index 0000000000..fe67bed9e0
--- /dev/null
+++ b/browser/base/content/test/sidebar/browser_sidebar_persist.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function persist_sidebar_width() {
+  {
+    // Make the main test window not count as a browser window any longer,
+    // which allows the persitence code to kick in.
+    const docEl = document.documentElement;
+    const oldWinType = docEl.getAttribute("windowtype");
+    docEl.setAttribute("windowtype", "navigator:testrunner");
+    registerCleanupFunction(() => {
+      docEl.setAttribute("windowtype", oldWinType);
+    });
+  }
+
+  {
+    info("Showing new window and setting sidebar box");
+    const win = await BrowserTestUtils.openNewBrowserWindow();
+    await win.SidebarUI.show("viewBookmarksSidebar");
+    win.document.getElementById("sidebar-box").style.width = "100px";
+    await BrowserTestUtils.closeWindow(win);
+  }
+
+  {
+    info("Showing new window and seeing persisted width");
+    const win = await BrowserTestUtils.openNewBrowserWindow();
+    await win.SidebarUI.show("viewBookmarksSidebar");
+    is(
+      win.document.getElementById("sidebar-box").style.width,
+      "100px",
+      "Width style should be persisted"
+    );
+    await BrowserTestUtils.closeWindow(win);
+  }
+});