gecko/modules/libpref/test/unit_ipc/test_initial_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) {
var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
pb.setBoolPref("Test.IPC.bool", true);
pb.setIntPref("Test.IPC.int", 23);
pb.setCharPref("Test.IPC.char", "hey");
run_test_in_child("test_existing_prefs.JS");
}
}