basic_replset_test.js does a good job of going over the basics of replication and failover via the ReplSetTest API. However, I think we can extend this test to cover topics such as electionTimeouts, priorities, etc so that engineers can use it as a one-stop test to figure out what behavior they're looking for.

We can also link this test to our architecture guide as a way for people to get started writing tests that use ReplSetTest.