async function verifyMissingTag(master, media, tagName) {
        const error = new shaka.util.Error(
            shaka.util.Error.Severity.CRITICAL,
            shaka.util.Error.Category.MANIFEST,
            Code.HLS_REQUIRED_TAG_MISSING,
            tagName);

        await verifyError(master, media, error, true);
      }
@param {string} master
@param {string} media
@param {string} tagName