https://docs.rs/txtar/latest/txtar/

txtar is used in the testsuite package to make writing CLI (blackbox) tests really easy. It adds a header section for the steps to run and comparisons to make. Often you compare actual output with golden data.

(https://github.com/golang/go/tree/master/src/cmd/go/testdata...)

The tools have been extracted and made installable from here: https://github.com/rogpeppe/go-internal/tree/master/cmd This is really handy for any project to have people submit reproducers as a single file anyone can run. These tools make it so you can transform between txtar and files on disk, and then run the txtar (testscript) as a test or directory of tests.

I have built them into my hof tool, "hof run [--mode test] file.txtar" so you run them as either test files or multifile scripts. The second option is handy if you want to eject a file onto the filesystem without having to do echo or EOF business in bash scripts

https://github.com/hofstadter-io/hof/tree/_dev/script/runtim...

hrx looks much better, as txtar can't include, e.g., other txtar files