1 files changed, 110 insertions, 0 deletions
diff --git a/toolkit/components/search/tests/xpcshell/test_webextensions_language_switch.js b/toolkit/components/search/tests/xpcshell/test_webextensions_language_switch.js
new file mode 100644
index 0000000000..6a781bba5b
--- /dev/null
+++ b/toolkit/components/search/tests/xpcshell/test_webextensions_language_switch.js
@@ -0,0 +1,110 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { promiseShutdownManager, promiseStartupManager } = AddonTestUtils;
+
+add_setup(async function () {
+  Services.locale.availableLocales = [
+    ...Services.locale.availableLocales,
+    "en",
+    "de",
+    "fr",
+  ];
+  Services.locale.requestedLocales = ["en"];
+
+  await SearchTestUtils.useTestEngines("data1");
+  await promiseStartupManager();
+  await Services.search.init();
+  await promiseAfterSettings();
+
+  registerCleanupFunction(promiseShutdownManager);
+});
+
+add_task(async function test_language_switch_changes_name() {
+  await SearchTestUtils.installSearchExtension(
+    {
+      name: "__MSG_engineName__",
+      id: "engine@tests.mozilla.org",
+      search_url_get_params: `q={searchTerms}&version=1.0`,
+      default_locale: "en",
+      version: "1.0",
+    },
+    { skipUnload: false },
+    {
+      "_locales/en/messages.json": {
+        engineName: {
+          message: "English Name",
+          description: "The Name",
+        },
+      },
+      "_locales/fr/messages.json": {
+        engineName: {
+          message: "French Name",
+          description: "The Name",
+        },
+      },
+    }
+  );
+
+  let engine = Services.search.getEngineById("engine@tests.mozilla.orgdefault");
+  Assert.ok(!!engine, "Should have loaded the engine");
+  Assert.equal(
+    engine.name,
+    "English Name",
+    "Should have loaded the English version of the name"
+  );
+
+  await Services.search.setDefault(
+    engine,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  let promiseChanged = TestUtils.topicObserved(
+    "browser-search-engine-modified",
+    (eng, verb) => verb == "engine-changed"
+  );
+
+  await promiseSetLocale("fr");
+
+  await promiseChanged;
+
+  engine = Services.search.getEngineById("engine@tests.mozilla.orgdefault");
+  Assert.ok(!!engine, "Should still be available");
+  Assert.equal(
+    engine.name,
+    "French Name",
+    "Should have updated to the French version of the name"
+  );
+
+  Assert.equal(
+    (await Services.search.getDefault()).id,
+    engine.id,
+    "Should have kept the default engine the same"
+  );
+
+  promiseChanged = TestUtils.topicObserved(
+    "browser-search-engine-modified",
+    (eng, verb) => verb == "engine-changed"
+  );
+
+  // Check for changing to a locale the add-on doesn't have.
+  await promiseSetLocale("de");
+
+  await promiseChanged;
+
+  engine = Services.search.getEngineById("engine@tests.mozilla.orgdefault");
+  Assert.ok(!!engine, "Should still be available");
+  Assert.equal(
+    engine.name,
+    "English Name",
+    "Should have fallen back to the default locale (English) version of the name"
+  );
+
+  Assert.equal(
+    (await Services.search.getDefault()).id,
+    engine.id,
+    "Should have kept the default engine the same"
+  );
+});