static buildMockLhr(url, options = {}) {
    /** @type {LH.Result} */
    const lhr = JSON.parse(process.env.LHCITEST_MOCK_LHR || '{}');
    lhr.requestedUrl = url;
    lhr.finalUrl = url;
    lhr.configSettings = lhr.configSettings || options.settings || {};
    return Promise.resolve(JSON.stringify(lhr));
  }
@param {string} url
@param {Partial<LHCI.CollectCommand.Options>} [options]
@return {Promise<string>}