How long did you sign up ago? A few days? A week? A month?
You won't be able to log on to Test until you recieve a confirmation email from Disney. However, you need to be patient. I know pirates that have applied for Test, and didn't get an email back from Disney for months on end. Of course, I know others who got their response in a matter of days. I'm guessing it just all depends on the amount of work they have to deal with at the moment.
Just stay patient, and in time, you'll get a response, whether good or bad. Happy pirating!