To build a complete site, run:
drush make --prepare-install build-testcenter.make ~/workspace/build
Navigate to the root directory in a webbrowser.
If you want to update just the install profile instead of rebuilding the entire site, you can run this:
drush make --no-core --contrib-destination=. drupal-org.make
If you want to force a rebuild of everything, you can do:
drush si panopoly
drush en testcenter_deploy -y
drush mi --all