I want to test to see if the Fabric version of Computercraft and Create have issues, but I am unsure how to go about testing that in singleplayer,

could you make an guide on how to do so?

ComputerCraft (I think) and Create should be supported. Create needs this extension though: https://www.curseforge.com/minecraft/mc-mods/opac-fabric-create-support
You can test protection using the non-ally-mode command, which temporarily blocks you from your own claims.