fune/ipc/testshell/tests/test_ipcshell.js

// eslint-disable-next-line mozilla/use-services
const runtime = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime);

function callback(result) {
  Assert.equal(result, Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT);
  do_test_finished();
}

function run_test() {
  do_test_pending();

  Assert.equal(runtime.processType, Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT);

  sendCommand("load('test_ipcshell_child.js');");

  sendCommand("runtime.processType;", callback);

  [
    ["C", "D"],
    ["D", "C"],
    ["\u010C", "D"],
    ["D", "\u010C"],
  ].forEach(function(pair) {
    do_test_pending();
    var cmp = pair[0].localeCompare(pair[1]);
    sendCommand("'" + pair[0] + "'.localeCompare('" + pair[1] + "');", function(
      result
    ) {
      Assert.equal(cmp, result);
      do_test_finished();
    });
  });
}