1 files changed, 104 insertions, 0 deletions
diff --git a/toolkit/components/search/tests/xpcshell/test_missing_engine.js b/toolkit/components/search/tests/xpcshell/test_missing_engine.js
new file mode 100644
index 0000000000..9be8c79ae8
--- /dev/null
+++ b/toolkit/components/search/tests/xpcshell/test_missing_engine.js
@@ -0,0 +1,104 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This test is designed to check the search service keeps working if there's
+// a built-in engine missing from the configuration.
+
+"use strict";
+
+const GOOD_CONFIG = [
+  {
+    webExtension: {
+      id: "engine@search.mozilla.org",
+    },
+    appliesTo: [
+      {
+        included: { everywhere: true },
+      },
+    ],
+  },
+];
+
+const BAD_CONFIG = [
+  ...GOOD_CONFIG,
+  {
+    webExtension: {
+      id: "engine-missing@search.mozilla.org",
+    },
+    appliesTo: [
+      {
+        included: { everywhere: true },
+      },
+    ],
+  },
+];
+
+add_task(async function setup() {
+  SearchTestUtils.useMockIdleService();
+  await AddonTestUtils.promiseStartupManager();
+
+  // This test purposely attempts to load a missing engine.
+  consoleAllowList.push(
+    "Could not load engine engine-missing@search.mozilla.org"
+  );
+});
+
+add_task(async function test_startup_with_missing() {
+  await SearchTestUtils.useTestEngines("data", null, BAD_CONFIG);
+
+  const result = await Services.search.init();
+  Assert.ok(
+    Components.isSuccessCode(result),
+    "Should have started the search service successfully."
+  );
+
+  const engines = await Services.search.getEngines();
+
+  Assert.deepEqual(
+    engines.map(e => e.name),
+    ["Test search engine"],
+    "Should have listed just the good engine"
+  );
+});
+
+add_task(async function test_update_with_missing() {
+  let reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+
+  await RemoteSettings(SearchUtils.SETTINGS_KEY).emit("sync", {
+    data: {
+      current: GOOD_CONFIG,
+    },
+  });
+
+  SearchTestUtils.idleService._fireObservers("idle");
+
+  await reloadObserved;
+
+  const engines = await Services.search.getEngines();
+
+  Assert.deepEqual(
+    engines.map(e => e.name),
+    ["Test search engine"],
+    "Should have just the good engine"
+  );
+
+  reloadObserved =
+    SearchTestUtils.promiseSearchNotification("engines-reloaded");
+
+  await RemoteSettings(SearchUtils.SETTINGS_KEY).emit("sync", {
+    data: {
+      current: BAD_CONFIG,
+    },
+  });
+
+  SearchTestUtils.idleService._fireObservers("idle");
+
+  await reloadObserved;
+
+  Assert.deepEqual(
+    engines.map(e => e.name),
+    ["Test search engine"],
+    "Should still have just the good engine"
+  );
+});