1 files changed, 51 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_insert_before_moved_node.js b/browser/components/customizableui/test/browser_insert_before_moved_node.js
new file mode 100644
index 0000000000..611f4e3ce0
--- /dev/null
+++ b/browser/components/customizableui/test/browser_insert_before_moved_node.js
@@ -0,0 +1,51 @@
+"use strict";
+
+/**
+ * Check inserting before a node that has moved from the toolbar into a
+ * non-customizable bit of the browser works.
+ */
+add_task(async function () {
+  for (let toolbar of ["nav-bar", "TabsToolbar"]) {
+    CustomizableUI.createWidget({
+      id: "real-button",
+      label: "test real button",
+    });
+    CustomizableUI.addWidgetToArea("real-button", toolbar);
+    CustomizableUI.addWidgetToArea("moved-button-not-here", toolbar);
+    let placements = CustomizableUI.getWidgetIdsInArea(toolbar);
+    Assert.deepEqual(
+      placements.slice(-2),
+      ["real-button", "moved-button-not-here"],
+      "Should have correct placements"
+    );
+    let otherButton = document.createXULElement("toolbarbutton");
+    otherButton.id = "moved-button-not-here";
+    if (toolbar == "nav-bar") {
+      gURLBar.textbox.parentNode.appendChild(otherButton);
+    } else {
+      gBrowser.tabContainer.appendChild(otherButton);
+    }
+    CustomizableUI.destroyWidget("real-button");
+    CustomizableUI.createWidget({
+      id: "real-button",
+      label: "test real button",
+    });
+
+    let button = document.getElementById("real-button");
+    ok(button, "Button should exist");
+    if (button) {
+      let expectedContainer = CustomizableUI.getCustomizationTarget(
+        document.getElementById(toolbar)
+      );
+      is(
+        button.parentNode,
+        expectedContainer,
+        "Button should be in the toolbar"
+      );
+    }
+
+    CustomizableUI.destroyWidget("real-button");
+    otherButton.remove();
+    CustomizableUI.reset();
+  }
+});