Implementing end-to-end testing for a custom language server

[kentookura]

Hi all,
I wish to implement e2e-testing for my custom language server. When looking at how the OCaml lsp implements this, it seems that it uses the lsp-fiber package to instrument a lsp client:

ocaml-lsp/ocaml-lsp-server/test/e2e-new/test.ml

Line 64 in 1628871

module Client = Lsp_fiber.Client

This library is private, so I can't directly mimic this implementation. I wonder if any thought has been put into this potential use case? It is certainly possible to implement a client from scratch using the lsp library, but that seems highly nontrivial.

Thanks!