How to remove Drupal Simpletest tables?

Question

When I run my tests:

drush test-run

... and it finishes, I'm left with tons of tables in my database. Things like:

simpletest69123cache_menu

I know it creates these to run the tests, but when its done, how do I get rid of them?

UPDATE

Bonus question: Does setup run for each individual test? i.e. do modules and everything get enabled every time for each test? (this takes forever and I can't imagine this is how everyone uses the testing with Drupal)

Answer 1

use the below command

drush test-clean

Here is all command lists for Drush

You will be able to run the individual test. Example comamnd

drush test-run --methods

Here is the list for available test.

Answer 2

In Drupal 8 you can run the following command from the root of the web site:

php core/scripts/run-tests.sh --clean

For more information refer also to Functional tests on Acquia's web site.