Are they any utilities to test ipfs networks?
What part of the network do you want to test? Latency? Uptime? Availability? There’s a lot out there already.
The first example that comes to mind is the public gateway checker: https://ipfs.github.io/public-gateway-checker/.
If you’re interacting with the command line interface there’s also a bunch of stuff built in. The webUI is pretty nice too. IPFS Cluster also has some “health check” features as well.
The answer here really depends on what you’re looking to accomplish?