gecko/modules/libpref/test/unit_ipc/test_existing_prefs.js

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const Ci = Components.interfaces;
const Cc = Components.classes;
function isParentProcess() {
let appInfo = Cc["@mozilla.org/xre/app-info;1"];
return (!appInfo || appInfo.getService(Ci.nsIXULRuntime).processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT);
}
function run_test() {
if (isParentProcess() == false) {
do_load_child_test_harness();
var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
pb.setBoolPref("Test.IPC.bool.new", true);
pb.setIntPref("Test.IPC.int.new", 23);
pb.setCharPref("Test.IPC.char.new", "hey");
run_test_in_child("test_observed_prefs.js");
}
}