1 files changed, 33 insertions, 0 deletions
diff --git a/remote/shared/messagehandler/test/browser/resources/modules/windowglobal/eventonprefchange.sys.mjs b/remote/shared/messagehandler/test/browser/resources/modules/windowglobal/eventonprefchange.sys.mjs
new file mode 100644
index 0000000000..33cb25d10b
--- /dev/null
+++ b/remote/shared/messagehandler/test/browser/resources/modules/windowglobal/eventonprefchange.sys.mjs
@@ -0,0 +1,33 @@
+/* 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/. */
+
+import { Module } from "chrome://remote/content/shared/messagehandler/Module.sys.mjs";
+
+const TEST_PREF = "remote.messagehandler.test.pref";
+
+class EventOnPrefChangeModule extends Module {
+  constructor(messageHandler) {
+    super(messageHandler);
+    Services.prefs.addObserver(TEST_PREF, this.#onPreferenceUpdated);
+  }
+
+  destroy() {
+    Services.prefs.removeObserver(TEST_PREF, this.#onPreferenceUpdated);
+  }
+
+  #onPreferenceUpdated = () => {
+    this.emitEvent("preference-changed");
+  };
+
+  /**
+   * Commands
+   */
+
+  ping() {
+    // We only use this command to force creating the module.
+    return 1;
+  }
+}
+
+export const eventonprefchange = EventOnPrefChangeModule;