Is there a standard / common way to switch between related files, such as an implementation file and a test file?

Oh, looks like projectile covers at least some of that

if you are using cider there is

i believe

Well, it's not necessarily a test file

I also want to switch to a stylesheet, for instance

I'm basically looking for a tool that lets me identify a bunch of files related to the current file by transforming path names, and switch to them quickly