fune/tools/code-coverage/tests/xpcshell/test_basic_child_and_parent.js

/* 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/. */

function run_test() {
  do_load_child_test_harness();
  do_test_pending();

  sendCommand("let v = 'test';", function() {
      let codeCoverage = Components.classes["@mozilla.org/tools/code-coverage;1"].getService(Components.interfaces.nsICodeCoverage);

      codeCoverage.dumpCounters();
      codeCoverage.resetCounters();

      do_test_finished();
  });
}