1 files changed, 75 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_947914_button_zoomReset.js b/browser/components/customizableui/test/browser_947914_button_zoomReset.js
new file mode 100644
index 0000000000..7dc8299b28
--- /dev/null
+++ b/browser/components/customizableui/test/browser_947914_button_zoomReset.js
@@ -0,0 +1,75 @@
+/* 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(async function () {
+  info("Check zoom reset button existence and functionality");
+  is(initialPageZoom, 1, "Page zoom reset correctly");
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "http://example.com", waitForLoad: true },
+    async function (browser) {
+      CustomizableUI.addWidgetToArea(
+        "zoom-controls",
+        CustomizableUI.AREA_FIXED_OVERFLOW_PANEL
+      );
+
+      registerCleanupFunction(() => CustomizableUI.reset());
+
+      CustomizableUI.addWidgetToArea(
+        "zoom-controls",
+        CustomizableUI.AREA_FIXED_OVERFLOW_PANEL
+      );
+
+      await waitForOverflowButtonShown();
+
+      {
+        let zoomChange = BrowserTestUtils.waitForEvent(
+          gBrowser,
+          "FullZoomChange"
+        );
+        ZoomManager.zoom = 0.5;
+        await zoomChange;
+      }
+
+      await document.getElementById("nav-bar").overflowable.show();
+      info("Menu panel was opened");
+
+      let zoomResetButton = document.getElementById("zoom-reset-button");
+      ok(zoomResetButton, "Zoom reset button exists in Panel Menu");
+
+      let zoomChange = BrowserTestUtils.waitForEvent(
+        gBrowser,
+        "FullZoomChange"
+      );
+      zoomResetButton.click();
+      await zoomChange;
+
+      let pageZoomLevel = Math.floor(ZoomManager.zoom * 100);
+      let expectedZoomLevel = 100;
+      let buttonZoomLevel = parseInt(zoomResetButton.getAttribute("label"), 10);
+      is(pageZoomLevel, expectedZoomLevel, "Page zoom reset correctly");
+      is(
+        pageZoomLevel,
+        buttonZoomLevel,
+        "Button displays the correct zoom level"
+      );
+
+      // close the panel
+      let panelHiddenPromise = promiseOverflowHidden(window);
+      document.getElementById("widget-overflow").hidePopup();
+      await panelHiddenPromise;
+      info("Menu panel was closed");
+    }
+  );
+});
+
+add_task(async function asyncCleanup() {
+  // reset zoom level
+  ZoomManager.zoom = initialPageZoom;
+  info("Zoom level was restored");
+});