How to create HTML file instead of txt from Groovy?

Hi All,

Instead of a txt file please let me know how to create an HTML file. Also in the HTML file I need to put the assertions like "success" or "failure" for each operation.

Thanks.

I am using the below line to create the txt file...
def bw = new BufferedWriter(new FileWriter("E:/CardOperationTests/CancelTransferFundsOutput, true));