1 files changed, 38 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_947914_button_zoomOut.js b/browser/components/customizableui/test/browser_947914_button_zoomOut.js
new file mode 100644
index 000000000..f9f51ac9a
--- /dev/null
+++ b/browser/components/customizableui/test/browser_947914_button_zoomOut.js
@@ -0,0 +1,38 @@
+/* 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/. */
+
+"use strict";
+
+var initialPageZoom = ZoomManager.zoom;
+
+add_task(function*() {
+  info("Check zoom out button existence and functionality");
+
+  is(initialPageZoom, 1, "Initial zoom factor should be 1");
+
+  yield PanelUI.show();
+  info("Menu panel was opened");
+
+  let zoomOutButton = document.getElementById("zoom-out-button");
+  ok(zoomOutButton, "Zoom out button exists in Panel Menu");
+
+  zoomOutButton.click();
+  let pageZoomLevel = Math.round(ZoomManager.zoom * 100);
+
+  let zoomResetButton = document.getElementById("zoom-reset-button");
+  let expectedZoomLevel = parseInt(zoomResetButton.getAttribute("label"), 10);
+  ok(pageZoomLevel < 100 && pageZoomLevel == expectedZoomLevel, "Page zoomed out correctly");
+
+  // close the panel
+  let panelHiddenPromise = promisePanelHidden(window);
+  PanelUI.hide();
+  yield panelHiddenPromise;
+  info("Menu panel was closed");
+});
+
+add_task(function* asyncCleanup() {
+  // reset zoom level
+  ZoomManager.zoom = initialPageZoom;
+  info("Zoom level was restored");
+});