1 files changed, 39 insertions, 0 deletions
diff --git a/modules/libpref/test/unit_ipc/test_locked_prefs.js b/modules/libpref/test/unit_ipc/test_locked_prefs.js
new file mode 100644
index 0000000000..037427e495
--- /dev/null
+++ b/modules/libpref/test/unit_ipc/test_locked_prefs.js
@@ -0,0 +1,39 @@
+/* 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/. */
+
+// Locked status should be communicated to children.
+
+function isParentProcess() {
+  return Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+}
+
+function run_test() {
+  const pb = Services.prefs;
+
+  let bprefname = "Test.IPC.locked.bool";
+  let iprefname = "Test.IPC.locked.int";
+  let sprefname = "Test.IPC.locked.string";
+
+  let isParent = isParentProcess();
+  if (isParent) {
+    pb.setBoolPref(bprefname, true);
+    pb.lockPref(bprefname);
+
+    pb.setIntPref(iprefname, true);
+    pb.lockPref(iprefname);
+
+    pb.setStringPref(sprefname, true);
+    pb.lockPref(sprefname);
+    pb.unlockPref(sprefname);
+
+    run_test_in_child("test_locked_prefs.js");
+  }
+
+  ok(pb.prefIsLocked(bprefname), bprefname + " should be locked in the child");
+  ok(pb.prefIsLocked(iprefname), iprefname + " should be locked in the child");
+  ok(
+    !pb.prefIsLocked(sprefname),
+    sprefname + " should be unlocked in the child"
+  );
+}