1 files changed, 45 insertions, 0 deletions
diff --git a/browser/base/content/test/zoom/browser_tabswitch_zoom_flicker.js b/browser/base/content/test/zoom/browser_tabswitch_zoom_flicker.js
new file mode 100644
index 0000000000..df1c3816ae
--- /dev/null
+++ b/browser/base/content/test/zoom/browser_tabswitch_zoom_flicker.js
@@ -0,0 +1,45 @@
+var tab;
+
+function test() {
+  // ----------
+  // Test setup
+
+  waitForExplicitFinish();
+
+  Services.prefs.setBoolPref("browser.zoom.updateBackgroundTabs", true);
+  Services.prefs.setBoolPref("browser.zoom.siteSpecific", true);
+
+  let uri =
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.org/browser/browser/base/content/test/zoom/zoom_test.html";
+
+  (async function () {
+    tab = BrowserTestUtils.addTab(gBrowser);
+    await FullZoomHelper.load(tab, uri);
+
+    // -------------------------------------------------------------------
+    // Test - Trigger a tab switch that should update the zoom level
+    await FullZoomHelper.selectTabAndWaitForLocationChange(tab);
+    ok(true, "applyPrefToSetting was called");
+  })().then(endTest, FullZoomHelper.failAndContinue(endTest));
+}
+
+// -------------
+// Test clean-up
+function endTest() {
+  (async function () {
+    await FullZoomHelper.removeTabAndWaitForLocationChange(tab);
+
+    tab = null;
+
+    if (Services.prefs.prefHasUserValue("browser.zoom.updateBackgroundTabs")) {
+      Services.prefs.clearUserPref("browser.zoom.updateBackgroundTabs");
+    }
+
+    if (Services.prefs.prefHasUserValue("browser.zoom.siteSpecific")) {
+      Services.prefs.clearUserPref("browser.zoom.siteSpecific");
+    }
+
+    finish();
+  })();
+}