1 files changed, 28 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_registerArea.js b/browser/components/customizableui/test/browser_registerArea.js
new file mode 100644
index 0000000000..2900c9eb8b
--- /dev/null
+++ b/browser/components/customizableui/test/browser_registerArea.js
@@ -0,0 +1,28 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that a toolbar area can be registered with overflowable: false
+ * as one of its properties, and this results in a non-overflowable
+ * toolbar.
+ */
+add_task(async function test_overflowable_false() {
+  registerCleanupFunction(removeCustomToolbars);
+
+  const kToolbarId = "no-overflow-toolbar";
+  createToolbarWithPlacements(kToolbarId, ["spring"], {
+    overflowable: false,
+  });
+
+  let node = CustomizableUI.getWidget(kToolbarId).forWindow(window).node;
+  Assert.ok(
+    !node.hasAttribute("overflowable"),
+    "Toolbar should not be overflowable"
+  );
+  Assert.ok(
+    !node.overflowable,
+    "OverflowableToolbar instance should not have been created."
+  );
+});