1 files changed, 54 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_update.js b/browser/components/extensions/test/browser/browser_ext_tabs_update.js
new file mode 100644
index 0000000000..3963def8af
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_update.js
@@ -0,0 +1,54 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async function () {
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:robots"
+  );
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:config"
+  );
+
+  gBrowser.selectedTab = tab1;
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["tabs"],
+    },
+
+    background: function () {
+      browser.tabs.query(
+        {
+          lastFocusedWindow: true,
+        },
+        function (tabs) {
+          browser.test.assertEq(tabs.length, 3, "should have three tabs");
+
+          tabs.sort((tab1, tab2) => tab1.index - tab2.index);
+
+          browser.test.assertEq(tabs[0].url, "about:blank", "first tab blank");
+          tabs.shift();
+
+          browser.test.assertTrue(tabs[0].active, "tab 0 active");
+          browser.test.assertFalse(tabs[1].active, "tab 1 inactive");
+
+          browser.tabs.update(tabs[1].id, { active: true }, function () {
+            browser.test.sendMessage("check");
+          });
+        }
+      );
+    },
+  });
+
+  await Promise.all([extension.startup(), extension.awaitMessage("check")]);
+
+  ok(gBrowser.selectedTab == tab2, "correct tab selected");
+
+  await extension.unload();
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});