Bug 1917462 - IDB: Create a new module for testing; r=dom-storage-reviewers,jari

Differential Revision: https://phabricator.services.mozilla.com/D219628

dom/indexedDB/moz.build

@@ -24,7 +24,7 @@ XPCSHELL_TESTS_MANIFESTS += [
     "test/unit/xpcshell-parent-process.toml",
 ]
 
-TEST_DIRS += ["test/gtest"]
+TEST_DIRS += ["test"]
 
 XPIDL_SOURCES += [
     "nsIIndexedDatabaseManager.idl",

dom/indexedDB/test/modules/system/IndexedDBUtils.sys.mjs

@@ -0,0 +1,42 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+export const IndexedDBUtils = {
+  /**
+   * Handles the completion of a request, awaiting either the `onsuccess` or
+   * `onerror` event before proceeding.
+   *
+   * This function is designed to handle requests of the types:
+   * - `IDBRequest`
+   * - `IDBOpenDBRequest`
+   *
+   * These requests are typically returned by IndexedDB API.
+   *
+   * @param {IDBRequest|IDBOpenDBRequest} request
+   *   The request object, which must have `onsuccess` and `onerror` event
+   *   handlers, as well as result and error properties.
+   * @returns {Promise}
+   *   Resolves with the request's result when the operation is successful.
+   * @throws {Error}
+   *   If the request encounters an error, this function throws the request's
+   *   `error` property.
+   */
+  async requestFinished(request) {
+    await new Promise(function (resolve) {
+      request.onerror = function () {
+        resolve();
+      };
+      request.onsuccess = function () {
+        resolve();
+      };
+    });
+
+    if (request.error) {
+      throw request.error;
+    }
+
+    return request.result;
+  },
+};

dom/indexedDB/test/moz.build

@@ -0,0 +1,11 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+TEST_DIRS += ["gtest"]
+
+TESTING_JS_MODULES.dom.indexedDB.test.modules += [
+    "modules/system/IndexedDBUtils.sys.mjs",
+]