Testnet Dev Question

I'm not a professional crypto dev but I know enough to build small applications. One thing that always plagues me is that there are no uniform tokens on the test nets. For example I'm creating a side project arb bot and ideally would like to find 2 Dex's, 2 LP pools and 2 coins so I can test arb strategies between the 2 pools.

Uniswap is pretty good about having their site functional on the testnets, but no where else can you find testnet versions of sites and coins. Shouldnt there be a testnet version of curve, etc?

Is the normal process for me to need to create my own LPs and everything? I'd imagine there is an easier way then needing to always build the testnet version of whatever infrastructure you plan to use on your project yourself