It's a respectful opinion to separate test and production environment and also their virtual infrastructure as you mentioned too. However if I said to put them together (or even in a clustered structure) it's because of your current situation. You have only two ESXi hosts and if you separate them and a single failure happens on one of these hosts, you have no failover option to reboot your virtual machines and they will fail too! I absolutely believe it's a great best practice to separate operational and pilot network/infrastructure but respect to the feasibility, first of all, you should consider how many physical resources are available and what you have! Balance your existed servers usage and always proritize between the security and availability factors that which one of them is more important on current state!
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