Yes you have to test each batch of hybrid seeds, especially with autos, since you can't keep them in clone, you can't be sure they will make good hybrids every time, but a simple Hybrid is only from 1 cross of 2 stable strains. The F1 cross. If you work it past F1, it's not a hybrid anymore, but new mixed "strains", because the recessive traits don't start showing up until F2. F1 of a cross shows only the dominant traits.
The main thing is that the parents of the F1's must be stable before you cross.
But you won't know what the hybrid will be like, until you test it. The whole batch should be very similar to the tested ones tho.