You're not populating the body of the e-mail with the right info.
mMessage.HTMLBody = mBody;
In the send mail routine populates the e-mail body.
You are passing that in as "message".
SendEmail("from@gmail.com", "to@gmail.com", "Notification - TestResults", message,
"c:\\results\\testresults\\TestResults.zip");
In the above line which calls the send mail routine.
But you are populating "message" with what looks like a heading?
var message = "Attached Test Results ";
If you want the body of the e-mail to contain your summary, you simply need to send it that info. If you want all the line breaks and spacing in there, you'll need to insert <BR> line escapes in the HTML body.