How to reset test database before each test run?

In order to have repeatable tests it seems a good idea to have a test database populated with known data against which to write the tests. Populating this database is straightforward and resetting it could be as simple as dropping it at the end of the test. But adding an automated `drop database` to my test scripts seems like a very bad idea since a config error could easily result in dropping a production database. Any suggestions? I'm using MongoDB and Mocha/Karma/Protractor.