code: function( tagName, inputString ) {
  		let ret = inputString;
  
  		if ( ret.indexOf( '<' + tagName ) === -1 ) {
  			ret = `<${tagName}>${ret}`;
  		}
  
  		if ( ret.indexOf( '</' + tagName + '>' ) === -1 ) {
  			ret = `${ret}</${tagName}>`;
  		}
  
  		return ret;
  	}
docs: Ensures that `string` is wrapped with an `tagName` element.
  
  @param {string} tagName
  @param {string} inputString
  @returns {string} A copy of `inputString` that is guaranteed to be wrapped with `tagName` element.