Combo test questions

We are thinking of implementing a few combo tests for our network elements (cisco routers with devmon).

We're wondering about what happens if the primary goes down, and things failover successfully to the secondary. Then if we blue out the primary failure, would the combo test still work if the secondary goes down? We'd be bluing out the primaries test, not the combo test.

Or would we need to do a more complex test that takes that into account?

Thanks,
Paul.