File: test_update_prefs.js

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function isParentProcess() {
  return Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
}

function run_test() {
  if (isParentProcess()) {
    do_load_child_test_harness();

    var pb = Services.prefs;

    // these prefs are set after the child has been created.
    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", testPrefClear);
  }
}

function testPrefClear() {
  var pb = Services.prefs;
  pb.clearUserPref("Test.IPC.bool.new");

  sendCommand(
    'var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);\n' +
      'pb.prefHasUserValue("Test.IPC.bool.new");\n',
    checkWasCleared
  );
}

function checkWasCleared(existsStr) {
  Assert.equal(existsStr, "false");
  do_test_finished();
}