1 files changed, 39 insertions, 0 deletions
diff --git a/browser/base/content/test/zoom/browser_image_zoom_tabswitch.js b/browser/base/content/test/zoom/browser_image_zoom_tabswitch.js
new file mode 100644
index 0000000000..83ffab26e8
--- /dev/null
+++ b/browser/base/content/test/zoom/browser_image_zoom_tabswitch.js
@@ -0,0 +1,39 @@
+/* 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";
+
+function test() {
+  let tab1, tab2;
+  const TEST_IMAGE =
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.org/browser/browser/base/content/test/general/moz.png";
+
+  waitForExplicitFinish();
+
+  (async function () {
+    tab1 = BrowserTestUtils.addTab(gBrowser);
+    tab2 = BrowserTestUtils.addTab(gBrowser);
+    await FullZoomHelper.selectTabAndWaitForLocationChange(tab1);
+    await FullZoomHelper.load(tab1, TEST_IMAGE);
+
+    is(ZoomManager.zoom, 1, "initial zoom level for first should be 1");
+
+    FullZoom.enlarge();
+    let zoom = ZoomManager.zoom;
+    isnot(zoom, 1, "zoom level should have changed");
+
+    await FullZoomHelper.selectTabAndWaitForLocationChange(tab2);
+    is(ZoomManager.zoom, 1, "initial zoom level for second tab should be 1");
+
+    await FullZoomHelper.selectTabAndWaitForLocationChange(tab1);
+    is(
+      ZoomManager.zoom,
+      zoom,
+      "zoom level for first tab should not have changed"
+    );
+
+    await FullZoomHelper.removeTabAndWaitForLocationChange(tab1);
+    await FullZoomHelper.removeTabAndWaitForLocationChange(tab2);
+  })().then(finish, FullZoomHelper.failAndContinue(finish));
+}