Test Lab Best Practices

Hello NANOG, We have been struggling with firmware bugs from a specific router vendor. I am looking to set up a test lab of our core network and a few remote site routers. Protocols would include SR-MPLS, ISIS, EVPN MPLS and L3VPN with a little OSPF sprinkled in. I'd be grateful for any tips or resources anyone has that might cover testing strategies and/or best practices. Thanks, Ken