append and instantly display a message to select option

append and instantly display a message to select option

http://jsbin.com/azipok/2/edit

this piece of code does the trick of clearing up the option list of select menu and adding a "test" message, but this message becomes visible only upon dropping down the select menu. 

is there a smart way to make this "test" message display and replace the "no modules..." text upon clicking the button?